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  • 1.
    Allard, Bert
    Örebro universitet, Institutionen för naturvetenskap och teknik.
    Alunskiffer – avfall eller råvara?: vittring och lakbarhet vid naturligt pH-intervall2014Konferansepaper (Annet vitenskapelig)
  • 2.
    Allard, Bert
    Örebro universitet, Institutionen för naturvetenskap och teknik.
    Passive barriers as a tool to treat environmental pollution2012Inngår i: / [ed] Mattiasson B, 2012, s. 50-51Konferansepaper (Fagfellevurdert)
  • 3.
    Allard, Bert
    Örebro universitet, Institutionen för naturvetenskap och teknik.
    Sustainable Business Mälardalen: sustainable environmental technology in a global arena2012Konferansepaper (Annet vitenskapelig)
  • 4.
    Allard, Bert
    Örebro universitet, Akademin för naturvetenskap och teknik.
    Uranbrytning i Sverige: ett miljöproblem?2009Konferansepaper (Fagfellevurdert)
  • 5.
    Allard, Bert
    et al.
    Örebro universitet, Institutionen för naturvetenskap och teknik.
    Andrusikiewicz, Waclaw
    Bäckström, Mattias
    Örebro universitet, Institutionen för naturvetenskap och teknik.
    Bilstad, Torleiv
    Cala, Marek
    Cholewa, Marcin
    Drielsma, Johannes
    Galos, Krzysztof
    Gehör, Seppo
    Karu, Veiko
    Kotarska, Izabela
    Koch, Lutz
    Kreisel, Stefan
    Kuiala, Kauko
    Kulczycka, Joanna
    Ostrega, Anna
    Repo, Hanna
    Sädbom, Stefan
    Szcech, Anna
    Szlugaj, Jaroslaw
    Szmigielski, Piotr
    Swierczynski, Wieslaw
    Uberman, Ryszard
    Valgma, Ingo
    Wrzosek, Krzysztof
    Mining waste management in the Baltic Sea Region: Min-Novation project2013Bok (Fagfellevurdert)
  • 6.
    Allard, Bert
    et al.
    Örebro universitet, Institutionen för naturvetenskap och teknik.
    Borchadt, D.
    Burri, P.
    Grigelis, A.
    Growitsch, C.
    Kalaydjian, F.
    Mair, R.
    Maisonnier, G.
    Pawlowski, L.
    Reichetseder, P.
    Swennen, R.
    Norton, M.
    Shale gas extraction: issues of particular relevance to the European Union2014Rapport (Annet vitenskapelig)
  • 7.
    Allard, Bert
    et al.
    Örebro universitet, Institutionen för naturvetenskap och teknik.
    Bäckström, Mattias
    Örebro universitet, Institutionen för naturvetenskap och teknik.
    Cala, Marek
    Ostreca, A.
    Reclamation and revitalisation of waste dumps or land after waste recovery2013Inngår i: Mining waste management in the Baltic Sea Region: Min-Novation project / [ed] Marek Cała, Krakow: Wydawnictwa AGH , 2013, s. 195-236Kapittel i bok, del av antologi (Fagfellevurdert)
  • 8.
    Allard, Bert
    et al.
    Örebro universitet, Akademin för naturvetenskap och teknik.
    Bäckström, Mattias
    Örebro universitet, Akademin för naturvetenskap och teknik.
    Häller, Sara
    Örebro universitet, Akademin för naturvetenskap och teknik.
    Panova, Elena
    St Petersburgs universitet, St Petersburg, Ryssland.
    Grawunder, Anja
    Friedrich Sciller Univ., Jena, Germany.
    Karlsson, Stefan
    Örebro universitet, Akademin för naturvetenskap och teknik.
    Water chemistry and trace metal concentrations in an acidic alum shale pit lake: effects of liming2011Inngår i: Mine water: managing the challenges: proceedings of the International Mine Water Association Congress 2011 / [ed] Trude R.Rüde, Antje Freund, Christian Wolkersdorfer, Aachen: RWTH , 2011, s. 503-508Konferansepaper (Fagfellevurdert)
  • 9.
    Allard, Bert
    et al.
    Örebro universitet, Institutionen för naturvetenskap och teknik.
    Bäckström, Mattias
    Örebro universitet, Institutionen för naturvetenskap och teknik.
    Karlsson, Stefan
    Örebro universitet, Institutionen för naturvetenskap och teknik.
    Grawunder, Anja
    Institute of Geoscience, Friedrich Schiller University, Jena, Germany .
    Neutralisation of an acidic pit lake by alkaline waste products2014Inngår i: Environmental science and pollution research international, ISSN 0944-1344, E-ISSN 1614-7499, Vol. 21, nr 11, s. 6930-6938Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    A former open pit where black shale (alum shale) was excavated during 1942-1965 has been water filled since 1966. The water chemistry was dominated by calcium and sulphate and had a pH of 3.2-3.4 until 1997-1998, when pH was gradually increasing. This was due to the intrusion of leachates from alkaline cement waste deposited close to the lake. A stable pH of around 7.5 was obtained after 6-7 years. The chemistry of the pit lake has changed due to the neutralisation. Concentrations of some dissolved metals, notably zinc and nickel, have gone down, as a result of adsorption/co-precipitation on solid phases (most likely iron and aluminium hydroxides), while other metals, notably uranium and molybdenum, are present at elevated levels. Uranium concentration is reaching a minimum of around pH 6.5 and is increasing at higher pH, which may indicate a formation of neutral and anionic uranyl carbonate species at high pH (and total carbonate levels around 1 mM). Weathering of the water-exposed shale is still in progress.

  • 10.
    Allard, Bert
    et al.
    Örebro universitet, Institutionen för naturvetenskap och teknik.
    Bäckström, Mattias
    Örebro universitet, Institutionen för naturvetenskap och teknik.
    Karlsson, Stefan
    Örebro universitet, Institutionen för naturvetenskap och teknik.
    Sartz, Lotta
    Örebro universitet, Institutionen för naturvetenskap och teknik. Bergskraft Bergslagen AB, Kumla, Sweden.
    Sjöberg, Viktor
    Örebro universitet, Institutionen för naturvetenskap och teknik.
    Sädbom, Stefan
    Bergskraft Bergslagen AB, Kumla, Sweden.
    Control of metal releases from historic sulphidic mine waste: Experience from the test site at the Ljusnarsberg mine field, Sweden (Project Bergskraft Bergslagen)2010Inngår i: Proc. EU Mine Drainage Research Exchange Conf. PADRE, June 11, Freiberg, Germany, 2010, s. 1 p-Konferansepaper (Fagfellevurdert)
  • 11.
    Allard, Bert
    et al.
    Örebro universitet, Institutionen för naturvetenskap och teknik.
    Bäckström, Mattias
    Örebro universitet, Institutionen för naturvetenskap och teknik.
    Karlsson, Stefan
    Örebro universitet, Institutionen för naturvetenskap och teknik.
    Sartz, Lotta
    Örebro universitet, Institutionen för naturvetenskap och teknik. Bergskraft Bergslagen AB.
    Sädbom, Stefan
    Bergskraft Bergslagen.
    Strategy for treatment of historic sulphidic mine waste: Experiences from the Ljusnarsberg Mine Field, Sweden2009Inngår i: Proc. 12th EuCheMS International Conference on Chemistry and the Environment, June 14-17, Stockholm, 2009, s. 197-Konferansepaper (Fagfellevurdert)
  • 12.
    Allard, Bert
    et al.
    Örebro universitet, Institutionen för naturvetenskap och teknik.
    Grandin, Anna
    Örebro universitet, Institutionen för naturvetenskap och teknik.
    Karlsson, Stefan
    Örebro universitet, Institutionen för naturvetenskap och teknik.
    Sjöberg, Viktor
    Örebro universitet, Institutionen för naturvetenskap och teknik.
    Black shale: a biogeochemical archive2014Inngår i: Sedimentary Pore Space Cementation: Role of Microbes / [ed] Kothe E, Büchel G, 2014, s. 6-Konferansepaper (Fagfellevurdert)
  • 13.
    Allard, Bert
    et al.
    Örebro universitet, Institutionen för naturvetenskap och teknik. Remedy by Sweden AB, Eskilstuna, Sweden; Mälardalen Univ., Västerås, Sweden.
    Hedlund, Jonas
    Structor Miljöteknik AB, Eskilstuna, Sweden.
    Carlsson, Peter
    Remedy by Sweden AB, Eskilstuna, Sweden; Structor Miljöteknik AB, Eskilstuna, Sweden.
    Eriksson, Ingvar
    Remedy by Sweden AB, Eskilstuna, Sweden; Structor Miljöteknik AB, Eskilstuna, Sweden.
    Sjöberg, Viktor
    Örebro universitet, Institutionen för naturvetenskap och teknik.
    Karlsson, Stefan
    Örebro universitet, Institutionen för naturvetenskap och teknik. Remedy by Sweden AB, Eskilstuna, Sweden.
    Metal mobility or metal concentration as the basis for remediation strategy: a case study2014Konferansepaper (Fagfellevurdert)
  • 14.
    Allard, Bert
    et al.
    Örebro universitet, Institutionen för naturvetenskap och teknik.
    Karlsson, Stefan
    Örebro universitet, Institutionen för naturvetenskap och teknik.
    Greis, Christina
    Örebro universitet, Institutionen för naturvetenskap.
    Pettersson, Håkan
    Linköpng Univ.
    Düker, Anders
    Örebro universitet, Institutionen för naturvetenskap och teknik.
    Redistribution of Pu, Am, Cs and Np in salt marsh sediment: Wigtown Merse, Irish Sea2009Inngår i: 8th International Conference on Methods and Applications of Radioanalytical Chemistry (MARC VIII) / [ed] Rolf Zeisler, Kenan Ünlü, Susan Heller-Zeisler, Melville, N.Y.: American Institute of Physics (AIP), 2009, s. 1-24Konferansepaper (Fagfellevurdert)
  • 15.
    Allard, Bert
    et al.
    Örebro universitet, Institutionen för naturvetenskap.
    Karlsson, Stefan
    Greis, Christina
    Örebro universitet, Institutionen för naturvetenskap.
    Pettersson, Håkan
    Düker, Anders
    Redistribution pf Pu, Am, Cs and Np in salt marsh sediment - Wigtown Merse, Irish SeaManuskript (Annet vitenskapelig)
  • 16.
    Allard, Bert
    et al.
    Örebro universitet, Institutionen för naturvetenskap och teknik.
    Karlsson, Stefan
    Örebro universitet, Institutionen för naturvetenskap och teknik.
    Sjöberg, Viktor
    Örebro universitet, Institutionen för naturvetenskap och teknik.
    Metal loads or metal concentrations as the basis for risk assessment of a polluted site: a case study2013Inngår i: Sardinia 2013: executive summaries : proceedings of the fourteenth International Waste Management and Landfill Symposium / [ed] Raffaello Cossu, Pinjing He, Peter Kjeldsen, Yasushi Matsufuji, Debra Reinhart, Rainer Stegmann, Cagliari: CISA , 2013Konferansepaper (Fagfellevurdert)
  • 17.
    Allard, Bert
    et al.
    Örebro universitet, Institutionen för naturvetenskap och teknik. Remedy by Sweden AB, Eskilstuna, Sweden; Mälardalen Univ., Västerås, Sweden.
    Martell, Ulrika
    Structor Miljöteknik AB, Eskilstuna, Sweden.
    Andersson, Matilda
    Structor Miljöteknik AB, Eskilstuna, Sweden.
    Nordén, Anna
    Structor Miljöteknik AB, Eskilstuna, Sweden.
    Karlsson, Stefan
    Örebro universitet, Institutionen för naturvetenskap och teknik. Remedy by Sweden AB, Eskilstuna, Sweden.
    Sjöberg, Viktor
    Örebro universitet, Institutionen för naturvetenskap och teknik.
    Carlsson, Peter
    Remedy by Sweden AB, Eskilstuna, Sweden; Structor Miljöteknik AB, Eskilstuna, Sweden.
    Reduction in situ of chromium(VI) at a heavily polluted site: a feasible remediation strategy2014Konferansepaper (Fagfellevurdert)
  • 18.
    Allard, Bert
    et al.
    Örebro universitet, Institutionen för naturvetenskap och teknik.
    Paneva, E.
    Saint Petersburg state university, St. Petersburg, Russia.
    Black shales in northern Europe: biogeochemical impact2014Inngår i: Biogenic-Abiogenic interactions in natural and anthropogenic systems, 2014Konferansepaper (Fagfellevurdert)
  • 19.
    Allard, Bert
    et al.
    Örebro universitet, Akademin för naturvetenskap och teknik.
    Sartz, Lotta
    Örebro universitet, Akademin för naturvetenskap och teknik.
    Karlsson, Stefan
    Örebro universitet, Akademin för naturvetenskap och teknik.
    Bäckström, Mattias
    Örebro universitet, Akademin för naturvetenskap och teknik.
    Metal releases from historic sulphidic mine site (Ljusnarsberg, Sweden): mobilization and attenuation processes2008Konferansepaper (Fagfellevurdert)
  • 20.
    Arwidsson, Zandra
    et al.
    Örebro universitet, Akademin för naturvetenskap och teknik. SAKAB AB, Kumla, Sweden.
    Allard, Bert
    Örebro universitet, Akademin för naturvetenskap och teknik.
    Remediation of Metal-Contaminated Soil by Organic Metabolites from Fungi II-Metal Redistribution2010Inngår i: Water, Air and Soil Pollution, ISSN 0049-6979, E-ISSN 1573-2932, Vol. 207, nr 1-4, s. 5-18Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Exudation of low molecular weight organic acids by fungi was studied in a project focusing on bioremediation of metal-contaminated soils. The production of acids (mainly oxalic and citric acid) as a response to nutrient variations and presence of metals has recently been reported (Arwidsson et al. 2009). A significant release of metals was observed and was related not only to the production of organic acids but also to the resulting pH decrease in the systems. The processes governing the release and redistribution of metals in the soil-water fungus system were the focus of the present continuation of the project, based on observations of Aspergillus niger, Penicillium bilaiae, and a Penicillium sp. The release of lead was 12% from the soil with the second highest initial load (1,600 mg kg(-1)), while the release of copper was 90% from the same soil (140 mg kg(-1)). The dominating mechanism behind the release and subsequent redistribution was the change in pH, going from near neutral to values in the range 2.1-5.9, reflecting the production of organic acids. For some of the systems, the formation of soluble complexes is indicated (copper, at intermediate pH) which favors the metal release. Iron is assumed to play a key role since the amount of secondary iron in the soils is higher than the total load of secondary heavy metals. It can be assumed that most of the heavy metals are initially associated with iron-rich phases through adsorption or coprecipitation. These phases can be dissolved, or associated metals can be desorbed, by a decrease in pH. It would be feasible to further develop a process in technical scale for remediation of metal-contaminated soil, based on microbial metabolite production leading to formation of soluble metal complexes, notably with copper.

  • 21.
    Arwidsson, Zandra
    et al.
    Örebro universitet, Akademin för naturvetenskap och teknik.
    Allard, Bert
    Örebro universitet, Akademin för naturvetenskap och teknik.
    Elgh-Dalgren, Kristin
    Örebro universitet, Akademin för naturvetenskap och teknik.
    van Hees, Patrick
    Örebro universitet, Akademin för naturvetenskap och teknik.
    Recycling of amino polycarboxylic acids in soil washing of heavy metal contaminated soilManuskript (preprint) (Annet vitenskapelig)
  • 22.
    Arwidsson, Zandra
    et al.
    SAKAB AB, Kumla, Sweden.
    Elgh-Dalgren, Kristin
    Örebro universitet, Akademin för naturvetenskap och teknik.
    Nehrenheim, Emma
    School of Sustainable Development of Society and Technology, Mälardalen University, Västerås, Sweden.
    Odlare, Monica
    School of Sustainable Development of Society and Technology, Mälardalen University, Västerås, Sweden.
    Ribé, Veronica
    School of Sustainable Development of Society and Technology, Mälardalen University, Västerås, Sweden.
    Sjöberg, Ragnar
    Solventic AB, Motala, Sweden.
    von Kronhelm, Tomas
    SAKAB AB, Kumla, Sweden.
    van Hees, Patrick
    Örebro universitet, Akademin för naturvetenskap och teknik.
    Allard, Bert
    Örebro universitet, Akademin för naturvetenskap och teknik.
    Remediation of soils and sludges containing organic contaminants as well as metals – soil-wash procedures combining biodegradation, chemical complexation and mechanical separation of particulate matter2009Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Soil contamination is an urgent issue world wide. More than 83,000 contaminated sites have been identified in Sweden alone, of which approximately some 4,000 require treatment in the near future. Most of the sites carry a mixture of contaminants, metals as well as persistent organics. Most soil remediation efforts are made ex situ, which means that the soil or sludge is dug up and transported to a facility for treatment, or simply for deposition. The aim of the present project is to design a strategy for ex situ treatment of soils with mixed contaminants. A variety of soils and sludges from different sites (around 10), essentially all with organic as well as inorganic (metallic) contaminants, have been selected for experimental studies in laboratory and pilot scale: Military sites (metals, explosives), wood preservation sites (PAHs, As, metals), industrial sites (metals, hydrocarbons, mercury, dioxins and others). Of particular importance in the present study are:

    Metals – Pb, Cu, Zn, Cr, Hg, as well as As Organics – PAHs, nitro aromatics, dioxins

    A number of processes are selected and applied: •Biodegradation - use of commercially available cultures, as well as bacteria cultivated from the contaminated site itself •Mobilisation of organics - use of surface active agents •Mobilisation of metals - use of (1) complexing microbial metabolites produced in the soil (by fungii in paricular), (2) complexing agents generated by degradation of natural organic products (polyhydroxy carboxylic acids), and (3) artificial complexing agents (polyamino carboxylic acids).

    Biodegradation is performed in batches (anaerobic in most cases), while release and mobilisation of contaminants from soil aggregates are achieved during soil-wash performed in a dynamic system where wash solution is forced through the soil under high pressure (the WTC-process). The efficiency of biodegradation and subsequent soil-wash under various conditions is evaluated from chemical analysis, but also by several ecotoxicological tests. Some results are given that illustrates suitable strategies for treatment of mixed contaminated soil from real sites (soil) as well as for treatment of residues from industrial production (sludges etc).

  • 23.
    Arwidsson, Zandra
    et al.
    Örebro universitet, Akademin för naturvetenskap och teknik. SAKAB AB, Kumla, Sweden.
    Elgh-Dalgren, Kristin
    Örebro universitet, Akademin för naturvetenskap och teknik.
    von Kronhelm, Thomas
    SAKAB AB, Kumla, Sweden.
    Sjoberg, Ragnar
    Solvent AB, Motala, Sweden.
    Allard, Bert
    Örebro universitet, Akademin för naturvetenskap och teknik.
    van Hees, Patrick A. W.
    Örebro universitet, Akademin för naturvetenskap och teknik.
    Remediation of heavy metal contaminated soil washing residues with amino polycarboxylic acids2010Inngår i: Journal of Hazardous Materials, ISSN 0304-3894, E-ISSN 1873-3336, Vol. 173, nr 1-3, s. 697-704Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Removal of Cu, Pb, and Zn by the action of the two biodegradable chelating agents [S,S]-ethylenediaminedisuccinic acid (EDDS) and methylglycinediacetic acid (MGDA), as well as citric acid, was tested. Three soil samples, which had previously been treated by conventional soil washing (water), were utilized in the leaching tests. Experiments were performed in batches (0.3 kg-scale) and with a WTC-mixer system (Water Treatment Construction, 10 kg-scale). EDDS and MGDA were most often equally efficient in removing Cu, Pb, and Zn after 10-60 min. Nonetheless, after 10 d, there were occasionally significant differences in extraction efficiencies. Extraction with citric acid was generally less efficient, however equal for Zn (mainly) after 10 d. Metal removal was similar in batch and WTC-mixer systems, which indicates that a dynamic mixer system could be used in full-scale. Use of biodegradable amino polycarboxylic acids for metal removal, as a second step after soil washing, would release most remaining metals (Cu, Pb and Zn) from the present soils, however only after long leaching time. Thus, a full-scale procedure, based on enhanced metal leaching by amino polycarboxylic acids from soil of the present kind, Would require a pre-leaching step lasting several days in order to be efficient. (C) 2009 Elsevier B.V. All rights reserved.

  • 24.
    Arwidsson, Zandra
    et al.
    Örebro University, School of Science & Technology, Örebro, Sweden; SAKAB AB, Kumla, Sweden.
    Johansson, Emma M.
    Örebro universitet, Akademin för naturvetenskap och teknik.
    von Kronhelm, Thomas
    SAKAB AB, Kumla Sweden.
    Allard, Bert
    Örebro universitet, Akademin för naturvetenskap och teknik.
    van Hees, Patrick A. W.
    Örebro universitet, Akademin för naturvetenskap och teknik. Eurofins Environment Sweden AB, Lidköping, Sweden.
    Remediation of Metal Contaminated Soil by Organic Metabolites from Fungi I—Production of Organic Acids2008Inngår i: Water, Air and Soil Pollution, ISSN 0049-6979, E-ISSN 1573-2932, Vol. 205, nr 1-4, s. 215-226Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Investigations were made on living strains offungi in a bioremediation process of three metal (lead)contaminated soils. Three saprotrophic fungi (Aspergillusniger, Penicillium bilaiae, and a Penicillium sp.) wereexposed to poor and rich nutrient conditions (no carbonavailability or 0.11 M D-glucose, respectively) andmetal stress (25 μM lead or contaminated soils) for5 days. Exudation of low molecular weight organicacids was investigated as a response to the metal andnutrient conditions. Main organic acids identified wereoxalic acid (A. niger) and citric acid (P. bilaiae).Exudation rates of oxalate decreased in response tolead exposure, while exudation rates of citrate were lessaffected. Total production under poor nutrient conditionswas low, except for A. niger, for which nosignificant difference was found between the poor andrich control. Maximum exudation rates were 20 μmoloxalic acid g^−1 biomass h^−1 (A. niger) and 20 μmolcitric acid g^−1 biomass h^−1 (P. bilaiae), in the presenceof the contaminated soil, but only 5 μmol organic acidsg^−1 biomass h^−1, in total, for the Penicillium sp. Therewas a significant mobilization of metals from the soilsin the carbon rich treatments and maximum release ofPb was 12% from the soils after 5 days. This was notsufficient to bring down the remaining concentration tothe target level 300 mg kg^−1 from initial levels of 3,800,1,600, and 370 mg kg^−1in the three soils. Target levelsfor Ni, Zn, and Cu, were 120, 500, and 200 mg kg^−1,respectively, and were prior to the bioremediationalready below these concentrations (except for Cu Soil1). However, maximum release of Ni, Zn, and Cu was28%, 35%, and 90%, respectively. The release of metalswas related to the production of chelating acids, but alsoto the pH-decrease. This illustrates the potential to usefungi exudates in bioremediation of contaminated soil.Nonetheless, the extent of the generation of organicacids is depending on several processes and mechanismsthat need to be further investigated.

  • 25.
    Arwidsson, Zandra
    et al.
    Örebro universitet, Akademin för naturvetenskap och teknik.
    Ålund, Marie
    Örebro universitet, Akademin för naturvetenskap och teknik.
    Allard, Bert
    Örebro universitet, Akademin för naturvetenskap och teknik.
    Leaching of metals from contamined soil with polyhydroxycarboxylic acids of natural originManuskript (preprint) (Annet vitenskapelig)
  • 26.
    Arwidsson, Zandra
    et al.
    SAKAB AB, Norrtorp, Sweden.
    Ålund, Marie
    SAKAB AB, Norrtorp, Sweden.
    Allard, Bert
    Örebro universitet, Akademin för naturvetenskap och teknik.
    Karlsson, Stefan
    Örebro universitet, Akademin för naturvetenskap och teknik.
    Metal mobilisation from soils and sediments by hydroxycarboxylic acids of natural origin2011Inngår i: Programme and Abstracts: 25th International Applied Geochemistry Symposium, 22-26 August, 2011, Rovaniemi, Finland / [ed] Pertti Sarala, V. Juhani Ojala, Marja-Leena Porsanger, Vuorimiesyhdistys - Finnish Association of Mining and Metallurgical Engineers , 2011, s. 77-77Konferansepaper (Fagfellevurdert)
  • 27.
    Bäckström, Mattias
    et al.
    Örebro universitet, Institutionen för naturvetenskap.
    Dario, Mårten
    Örebro universitet, Institutionen för naturvetenskap.
    Allard, Bert
    Örebro universitet, Institutionen för naturvetenskap.
    Karlsson, Stefan
    Örebro universitet, Institutionen för naturvetenskap.
    Effects of a fulvic acid on the adsorption of mercury and cadmium on goethite2003Inngår i: Science of the Total Environment, ISSN 0048-9697, E-ISSN 1879-1026, Vol. 304, nr 1-3, s. 257-268Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The effects of an aquatic fulvic acid on the pH-dependent adsorption of Hg(II) and Cd(II) to particulate goethite (a-FeOOH) were studied in batch systems. The ionic medium consisted of 0.01 M HClO and the total concentrations 4 of mercury and cadmium were maintained at 10y8 M with 203Hg and 109Cd as tracers. pH In the systems was varied in the range 3–10 by addition of HClO and NaOH.All commercial chemicals were of analytical grade or better. An 4 aquatic fulvic acid (20 ppm), previously isolated and characterised in detail, was used as a model for humic substances and its adsorption to goethite is included in this study. The adsorption of the fulvic acid (20 ppm) onto goethite decreased slowly from 90% at pH 3–7.5 to 10% at pH 10. In systems without fulvic acid the adsorption of mercury increased in a linear fashion from 10% at pH 3 to 70% at pH 10.In the presence of fulvic acid (20 ppm), the adsorption was almost quantitative in the intermediate pH range (pH 5–7), and exceeded 92% over the entire pH range. Thus, association between mercury and the fulvic acid enhanced adsorption in general although the largest impact was found at low pH.Adsorption of cadmium increased from nearly 0 to almost 100% at approximately pH 6. In the presence of fulvic acid, the adsorption increased below pH 7 and decreased above pH 7. The adsorption isotherm for mercury when the concentration was increased from 10y8 to 1.8=10y4 M showed a corresponding increase of K (lyg) up to a total concentration at 10y6 M.At higher mercury concentrations K was lowered. In the presence of fulvic acid the corresponding relationship of K was bi-modal, i.e. high values at low and intermediate concentrations of mercury. This behaviour suggests that in the absence of fulvic acid the adsorption follow the expected behaviour, i.e. adsorption sites with similar affinity for mercury. In the presence of fulvic acid, additional adsorption sites are available by the organic molecule (possibly sulfur groups) when it is associated to the goethite. The adsorption isotherm for cadmium indicates a lowering of K at 10y4 M. Cadmium had no competitive effect on mercury and vice versa. Zinc, however, affected the adsorption of cadmium but not the adsorption of mercury.

  • 28. Bäckström, Mattias
    et al.
    Dario, Mårten
    Örebro universitet, Institutionen för naturvetenskap.
    Karlsson, Stefan
    Allard, Bert
    Örebro universitet, Institutionen för naturvetenskap.
    Effects of a fulvic acid on the adsorption of mercury and cadmium on goethite2003Inngår i: Science of the Total Environment, ISSN 0048-9697, E-ISSN 1879-1026, Vol. 304, nr 1-3, s. 257-268Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The effects of an aquatic fulvic acid on the pH-dependent adsorption of Hg(II) and Cd(II) to particulate goethite (alpha-FeOOH) were studied in batch systems. The ionic medium consisted of 0.01 M HClO(4) and the total concentrations of mercury and cadmium were maintained at 10(-8) M with 203Hg and 109Cd as tracers. pH In the systems was varied in the range 3-10 by addition of HClO(4) and NaOH. All commercial chemicals were of analytical grade or better. An aquatic fulvic acid (20 ppm), previously isolated and characterised in detail, was used as a model for humic substances and its adsorption to goethite is included in this study. The adsorption of the fulvic acid (20 ppm) onto goethite decreased slowly from 90% at pH 3-7.5 to 10% at pH 10. In systems without fulvic acid the adsorption of mercury increased in a linear fashion from 10% at pH 3 to 70% at pH 10. In the presence of fulvic acid (20 ppm), the adsorption was almost quantitative in the intermediate pH range (pH 5-7), and exceeded 92% over the entire pH range. Thus, association between mercury and the fulvic acid enhanced adsorption in general although the largest impact was found at low pH. Adsorption of cadmium increased from nearly 0 to almost 100% at approximately pH 6. In the presence of fulvic acid, the adsorption increased below pH 7 and decreased above pH 7. The adsorption isotherm for mercury when the concentration was increased from 10(-8) to 1.8 x 10(-4) M showed a corresponding increase of K(d) (l/g) up to a total concentration at 10(-6) M. At higher mercury concentrations K(d) was lowered. In the presence of fulvic acid the corresponding relationship of K(d) was bi-modal, i.e. high values at low and intermediate concentrations of mercury. This behaviour suggests that in the absence of fulvic acid the adsorption follow the expected behaviour, i.e. adsorption sites with similar affinity for mercury. In the presence of fulvic acid, additional adsorption sites are available by the organic molecule (possibly sulfur groups) when it is associated to the goethite. The adsorption isotherm for cadmium indicates a lowering of K(d) at 10(-4) M. Cadmium had no competitive effect on mercury and vice versa. Zinc, however, affected the adsorption of cadmium but not the adsorption of mercury.

  • 29.
    Bäckström, Mattias
    et al.
    Örebro universitet, Institutionen för naturvetenskap och teknik.
    Häller, Sara
    Örebro universitet, Institutionen för naturvetenskap och teknik.
    Allard, Bert
    Örebro universitet, Institutionen för naturvetenskap och teknik.
    Geochemical processes in a historical alum shale dump, Kvarntorp2011Inngår i: Programme and Abstracts / [ed] Sarala P, Ojala VJ, Porsanger M-L, Vuorimiesyhdistys , 2011, s. 97, 6p CD-Rom-Konferansepaper (Fagfellevurdert)
  • 30.
    Bäckström, Mattias
    et al.
    Örebro universitet, Institutionen för naturvetenskap.
    Karlsson, Stefan
    Örebro universitet, Institutionen för naturvetenskap.
    Allard, Bert
    Örebro universitet, Institutionen för naturvetenskap.
    Metal leachability and anthropogenic signal in roadside soils estimated from sequential extraction and stable lead isotopes2004Inngår i: Environmental Monitoring & Assessment, ISSN 0167-6369, E-ISSN 1573-2959, Vol. 90, nr 1-3, s. 135-160Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Several roadside soil samples were collected at two field sites in Sweden. They were analysed for total elemental content (using both ICP-MS and XRF) and stable lead isotopes. Extraction with deicing salt solution and sequential extraction were performed in order to elucidate the potential mobility due to the use of deicing agents. The total concentrations of elements, especially lead, have decreased and lead is presently almost at background concentrations (15–51 ppm for surface samples). However, the isotopic signature indicates that old gasoline lead still is left at the site constructed prior to 1975. The field site constructed in 1992 showed, however, no 206Pb/207Pb ratio below 1.14. Only minor amounts were leached using deicing salt solutions; for lead only 0.29%, on average, was extracted indicating that the mobile fraction already was released. Sequential extraction indicated that lead mainly was associated with reducible (34.4%) and oxidisable (35.4%) fractions. Exchangable and acid soluble fractions contained 20.3% while 10.0% was found in the residual fraction. The salt extraction released, however, very low concentrations indicating that most in fraction 1 is acid soluble (e.g. carbonates). Tungsten was also found at high concentrations indicating a possible impact from studded tires. For tungsten the following composition was obtained: residual (48.0%) > oxidisable (47.6%) > reducible (3.3%) > exchangeable/acid soluble (1.1%). From the isotopic studies it was also suggested that the order for incorporating anthropogenic lead into soils is exchangeable/carbonates > (hydr)oxides > organic matter > residual. The multivariate technique principal component analysis (PCA) seems promising for evaluating large sequential extraction datasets.

  • 31.
    Bäckström, Mattias
    et al.
    Örebro universitet, Institutionen för naturvetenskap.
    Karlsson, Stefan
    Örebro universitet, Institutionen för naturvetenskap.
    Allard, Bert
    Örebro universitet, Institutionen för naturvetenskap.
    Mobilisation of lead: field measurements at a trap range compared to solubility experiments2000Konferansepaper (Fagfellevurdert)
  • 32.
    Bäckström, Mattias
    et al.
    Örebro universitet, Institutionen för naturvetenskap.
    Nilsson, Ulrika
    Håkansson, Karsten
    Allard, Bert
    Örebro universitet, Institutionen för naturvetenskap.
    Karlsson, Stefan
    Örebro universitet, Institutionen för naturvetenskap.
    Speciation of heavy metals in road runoff and roadside total deposition2003Inngår i: Water, Air and Soil Pollution, ISSN 0049-6979, E-ISSN 1573-2932, Vol. 147, nr 1-4, s. 343-366Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The concentrations of Cd, Co, Cu, Pb, W and Zn were measured in road runoff and total deposition at two Swedish field sites during one year. It was found that the concentrations of most elements increased significantly during the winter, up to one order of magnitude. For cobalt and tungsten, it was found that around 90% of the total mass transport occurred during the winter, whereas for Cu, Pb, Cd, Zn and Na, the corresponding figures were 70–90, 40–80, 60–90, 50–70 and >99% depending on site specific conditions. The deicing salts (rock salts) did not significantly contribute to the increase in trace element concentrations. Instead, the increased concentrations were due to more intense wearing of the pavement during the winter because of the use of studded tires in combination with the chemical effects caused by the use of deicing salts. New potential elemental markers for roads and traffic are suggested.

  • 33.
    Bäckström, Mattias
    et al.
    Örebro universitet, Akademin för naturvetenskap och teknik.
    Sartz, Lotta
    Örebro universitet, Akademin för naturvetenskap och teknik.
    Karlsson, Stefan
    Örebro universitet, Akademin för naturvetenskap och teknik.
    Allard, Bert
    Örebro universitet, Akademin för naturvetenskap och teknik.
    Prevention of ARD through stabilization of waste rock with alkaline by-products: results from a meso-scale experiment2010Inngår i: Mina Water & Innovative Thinking: proceedings 2010 / [ed] Wolkersdorfer, C. & Freund, A, Nova Scotia, Canada: Cape Breton University Press , 2010, s. 559-563Konferansepaper (Fagfellevurdert)
  • 34. Dahlén, Johan
    et al.
    Bäckström, Mattias
    Örebro universitet, Institutionen för naturvetenskap.
    Ephraim, James
    Borén, Hans
    Allard, Bert
    Örebro universitet, Institutionen för naturvetenskap.
    Determination of the molecular weight of fulvic acids by UV/VIS spectroscopy1999Inngår i: Chemosphere, ISSN 0045-6535, E-ISSN 1879-1298, Vol. 38, nr 4, s. 783-794Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Partial least squares (PLS) modeling was applied to investigate number-average molecular weights (Mn) and weight-average molecular weights (Mw) of fulvic acids (FAs) in relation to the corresponding UVNIS spectra. The Mn and Mw values were determined by size exclusion chromatography (SEC). The impact of pH control, wavelength range and density as well as smoothing and derivation of spectra were tested. It was found that PLS models based on absorbance spectra can be a fast and powerful complement to existing techniques employed for determination of molecular weights of FAs. Control of pH of the FA solutions is important for the performance of the models. The models were also compared with the best univariate alternatives.

  • 35.
    Dario, Mårten
    et al.
    Örebro universitet, Institutionen för naturvetenskap.
    Allard, Bert
    Örebro universitet, Institutionen för naturvetenskap.
    Sorption of europium onto titanium dioxide at high pH: influence of isosaccharinic and fulvic acidManuskript (preprint) (Annet vitenskapelig)
  • 36.
    Dario, Mårten
    et al.
    Örebro universitet, Institutionen för naturvetenskap.
    Molera, Mireia
    Allard, Bert
    Örebro universitet, Institutionen för naturvetenskap.
    Sorption of europium on TiO2 and cement at high pH in the presence of organic ligands2006Inngår i: Journal of Radioanalytical and Nuclear Chemistry, ISSN 0236-5731, E-ISSN 1588-2780, Vol. 270, nr 3, s. 495-505Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Organic substances present in radioactive waste lower the sorption of metal ions at the high pH in cement matrices and, hence, enhance their possible migration. The aim of this study was to develop a method to compare organic substances or their degradation products with respect to what extent they affect metal sorption. Batch sorption studies were performed with cement or TiO2 as solid phase and Eu(III) as a model element for trivalent lanthanides and actinides at pH 12.5 (representative of a cement waste matrix during the first approximately 100,000 years). Different kinds of ligands were studied in a broad concentration range, e.g., organic acids, cement additives, cleaning agents and degradation products from ion-exchange resin.

  • 37.
    Duro, Lara
    et al.
    Amphos 21 Consulting S.L., Barcelona, Spain.
    Grivé, Mireia
    Amphos 21 Consulting S.L., Barcelona, Spain.
    Gaona, Xavier
    Amphos 21 Consulting S.L., Barcelona, Spain.
    Bruno, Jordi
    Amphos 21 Consulting S.L., Barcelona, Spain.
    Anderson, Thomas
    Linköping University, Linköping, Sweden.
    Borén, Hans
    Linköping University, Linköping, Sweden.
    Dario, Mårten
    Linköping University, Linköping, Sweden.
    Allard, Bert
    Örebro universitet, Institutionen för naturvetenskap och teknik.
    Hagberg, Jessika
    Örebro universitet, Institutionen för naturvetenskap och teknik.
    Källström, Klas
    Svensk Kärnbränslehantering AB, Stockholm, Sweden.
    Study of the effect of the fibre mass UP2 degradation products on radionuclide mobilisation2012Rapport (Fagfellevurdert)
  • 38. Elgh-Dalgren, Kristin
    et al.
    Arwidsson, Zandra
    Camdzija, Aida
    Sjoberg, Ragnar
    Ribé, Veronica
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik.
    Waara, Sylvia
    Mälardalens högskola, Akademin för hållbar samhälls- och teknikutveckling.
    Allard, Bert
    von Kronhelm, Thomas
    van Hees, Patrick A. W.
    Laboratory and pilot scale soil washing of PAH and arsenic from a wood preservation site: Changes in concentration and toxicity2009Inngår i: Journal of Hazardous Materials, ISSN 0304-3894, E-ISSN 1873-3336, Vol. 172, nr 2-3, s. 1033-1040Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Soil washing of a soil with a mixture of both polycyclic aromatic hydrocarbons (PAH) and As was evaluated in laboratory and pilot scale, utilizing both single and mixtures of different additives. The highest level of decontamination was achieved with a combination of 0.213 M of the chelating agent MGDA and 3.2 x CMC* of a non-ionic, alkyl glucoside surfactant at pH 12 (Ca(OH)(2)). This combination managed to reach Swedish threshold values within 10 min of treatment when performed at elevated temperature (50 degrees C), with initial contaminant concentrations of As = 105 +/- 4 mg/kg and US-EPA PAH(16) = 46.0 +/- 2.3 mg/kg. The main mechanisms behind the removal were the pH effect for As and a combination of SOM ionization as a result of high pH and micellar solubilization for PAHs. Implementation of the laboratory results utilizing a pilot scale equipment did not improve the performance, which may be due to the shorter contact time between the washing solution and the particles, or changes in physical characteristics of the leaching solution due to the elevated pressure utilized. The ecotoxicological evaluation, Microtox (R), demonstrated that all soil washing treatments increased the toxicity of soil leachates, possibly due to increased availability of contaminants and toxicity of soil washing solutions to the test organism. (C) 2009 Elsevier B.V. All rights reserved.

  • 39.
    Elgh-Dalgren, Kristin
    et al.
    Man-Technology-Environment Research Center, School of Science and Technology, Örebro University, Örebro, Sweden.
    Arwidsson, Zandra
    Man-Technology-Environment Research Center, School of Science and Technology, Örebro University, Örebro, Sweden & Sakab AB, Norrtorp, Kumla, Sweden.
    Camdzija, Aida
    Man-Technology-Environment Research Center, School of Science and Technology, Örebro University, Örebro, Sweden.
    Sjöberg, Ragnar
    Solventic AB, Motala, Sweden.
    Ribé, Veronica
    School for Sustainable Development of Society and Technology, Mälardalen University, Västerås, Sweden.
    Waara, Sylvia
    School for Sustainable Development of Society and Technology, Mälardalen University, Västerås, Sweden.
    Allard, Bert
    Man-Technology-Environment Research Center, School of Science and Technology, Örebro University, Örebro, Sweden.
    von Kronhelm, Thomas
    Sakab AB, Norrtorp, Kumla, Sweden.
    van Hees, Patrick A. W.
    Man-Technology-Environment Research Center, School of Science and Technology, Örebro University, Örebro, Sweden & Eurofins Environment Sweden AB, Lidköping, Sweden.
    Laboratory and pilot scale soil washing of PAH and arsenic from a wood preservation site: Changes in concentration and toxicity2009Inngår i: Journal of Hazardous Materials, ISSN 0304-3894, E-ISSN 1873-3336, Vol. 172, nr 2-3, s. 1033-1040Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Soil washing of a soil with a mixture of both polycyclic aromatic hydrocarbons (PAH) and As was evaluated in laboratory and pilot scale, utilizing both single and mixtures of different additives. The highest level of decontamination was achieved with a combination of 0.213 M of the chelating agent MGDA and 3.2 × CMC* of a non-ionic, alkyl glucoside surfactant at pH 12 (Ca(OH)2). This combination managed to reach Swedish threshold values within 10 min of treatment when performed at elevated temperature (50 °C), with initial contaminant concentrations of As = 105 ± 4 mg/kg and US-EPA PAH16 = 46.0 ± 2.3 mg/kg. The main mechanisms behind the removal were the pH effect for As and a combination of SOM ionization as a result of high pH and micellar solubilization for PAHs. Implementation of the laboratory results utilizing a pilot scale equipment did not improve the performance, which may be due to the shorter contact time between the washing solution and the particles, or changes in physical characteristics of the leaching solution due to the elevated pressure utilized. The ecotoxicological evaluation, Microtox®, demonstrated that all soil washing treatments increased the toxicity of soil leachates, possibly due to increased availability of contaminants and toxicity of soil washing solutions to the test organism. © 2009 Elsevier B.V. All rights reserved.

  • 40.
    Elgh-Dalgren, Kristin
    et al.
    Örebro universitet, Akademin för naturvetenskap och teknik.
    Arwidsson, Zandra
    Sakab AB.
    Camdzija, Aida
    Sjöberg, Ragnar
    Ribé, Veronica
    Mälardalen University.
    Waara, Sylvia
    Mälardalen University.
    Allard, Bert
    Örebro universitet, Akademin för naturvetenskap och teknik.
    von Kronhelm, Thomas
    van Hees, Patrick A. W.
    Örebro universitet, Akademin för naturvetenskap och teknik.
    Laboratory and pilot scale soil washing of PAH and arsenic from a wood preservation site: Changes in concentration and toxicity2009Inngår i: Journal of Hazardous Materials, ISSN 0304-3894, E-ISSN 1873-3336, Vol. 172, nr 2-3, s. 1033-1040Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Soil washing of a soil with a mixture of both polycyclic aromatic hydrocarbons (PAH) and As was evaluated in laboratory and pilot scale, utilizing both single and mixtures of different additives. The highest level of decontamination was achieved with a combination of 0.213 M of the chelating agent MGDA and 3.2xCMC* of a nonionic, alkyl glucoside surfactant at pH 12 (Ca(OH)2). This combination managed to reach Swedish threshold values within 10 min of treat­ment when performed at elevated temperature (50°C), with initial conta­minant concentrations of As = 105±4 mg/kg and US-EPA PAH16 = 46.0±2.3 mg/kg. The main mechanisms behind the removal were the pH-effect for As and a combina­tion of SOM-ionization as a result of high pH and micellar solu­bilization for PAHs. Implementation of the laboratory results utilizing a pilot scale equipment did not improve the performance, which may be due to the shorter contact time between the washing solution and the particles, or changes in physical characte­ristics of the leaching solution due to the elevated pressure utilized. The ecotox­icological evaluation, Microtox®, demonstrated that all soil washing treatments increased the toxicity of soil leachates, possibly due to in­creased availability of contaminants and toxicity of soil washing solutions to the test organism.

  • 41.
    Elgh-Dalgren, Kristin
    et al.
    Örebro universitet, Akademin för naturvetenskap och teknik.
    Arwidsson, Zandra
    Örebro universitet, Akademin för naturvetenskap och teknik.
    Sjöberg, Ragnar
    Allard, Bert
    Örebro universitet, Akademin för naturvetenskap och teknik.
    von Kronhelm, Tomas
    van Hees, Patrick
    Örebro universitet, Akademin för naturvetenskap och teknik.
    Effect of chemical amendments on the distribution of arsenic and polycyclic aromatic hydrocarbons in a contaminated soil2009Konferansepaper (Fagfellevurdert)
  • 42.
    Elgh-Dalgren, Kristin
    et al.
    Örebro universitet, Akademin för naturvetenskap och teknik.
    Düker, Anders
    Örebro universitet, Akademin för naturvetenskap och teknik.
    Allard, Bert
    Örebro universitet, Akademin för naturvetenskap och teknik.
    van Hees, Patrick
    Örebro universitet, Akademin för naturvetenskap och teknik.
    Simultaneous re­mediation of explosives and lead from contaminated soil by pH-adjust­mentManuskript (preprint) (Annet vitenskapelig)
    Abstract [en]

    Soil washing with pH-adjusted water was evaluated in two soils containing dif­ferent concentrations of heavy metals and explosives. Overall, the most efficient treatment was with water adjusted to pH 12 by NaOH. For explosives, pH 12 removed significantly higher amounts (P<0.05) of RDX and TNT compared to pH 4 (adjusted with HNO3) and distilled water in a moderately contaminated soil (230 mg HMX/kg, 1340 mg RDX/kg, 450 mg TNT/kg). In a more highly contaminated soil (6080 mg HMX/kg, 28740 mg RDX/kg, 3120 mg TNT/kg), the pH 12-treatment was the most efficient for removal of TNT and 2,4-DNT. Explosives removal increased with treatment time, probably due to the kineti­cally slow processes underlying the explosives degradation. Mobilization of heavy metals was strongly dependent on pH, with pH 12 mobilizing more than pH 3. In addition, the change in distribution coefficient (Kd) was more pro­nounced for local contaminants Pb and Cd in comparison with Cu and Zn, which were present in background concentrations.

  • 43.
    Fahlqvist, Linnea
    et al.
    Örebro universitet, Institutionen för naturvetenskap och teknik. Bergskraft Bergslagen, Kopparberg, Sweden.
    Bäckström, Mattias
    Örebro universitet, Institutionen för naturvetenskap och teknik.
    Sartz, Lotta
    Örebro universitet, Institutionen för naturvetenskap och teknik. Bergskraft Bergslagen AB, Kopparberg, Sweden.
    Allard, Bert
    Örebro universitet, Institutionen för naturvetenskap och teknik.
    Removal of uranium from a neutral mine water using uncoated and iron oxyhydroxide coated iron tailings2013Inngår i: Annual International Mine Water Association Conference: Reliable Mine Water Technology / [ed] Brown, A.; Figueroa, L. & Wolkersdorfer, Ch., Colorado, USA: IMWA , 2013, s. 551-557Konferansepaper (Fagfellevurdert)
  • 44.
    Grahn, Evastina
    et al.
    Örebro universitet, Institutionen för naturvetenskap.
    Greis, Christina
    Örebro universitet, Institutionen för naturvetenskap.
    Karlsson, Stefan
    Örebro universitet, Institutionen för naturvetenskap.
    Düker, Anders
    Örebro universitet, Institutionen för naturvetenskap.
    Allard, Bert
    Örebro universitet, Institutionen för naturvetenskap.
    Pettersson, Håkan
    Failure of 137Cs and 239/240Pu dating of lake sediments: fallout from nuclear weapons testing and from the Chernobyl accident as well as redistribution processes?Manuskript (Annet vitenskapelig)
  • 45.
    Grahn, Evastina
    et al.
    Örebro universitet, Institutionen för naturvetenskap.
    Greis, Christina
    Örebro universitet, Institutionen för naturvetenskap.
    Karlsson, Stefan
    Düker, Anders
    Allard, Bert
    Örebro universitet, Institutionen för naturvetenskap.
    Pettersson, Håkan
    Failure of 137Cs and 239,240Pu dating of lake sediments: fallout from nuclear weapons testing, the Chernobyl accident and redistribution processes?Manuskript (preprint) (Annet vitenskapelig)
  • 46. Grandin, Anna
    et al.
    Ogar, Anna
    Institute of Environmental Science, Jagiellonian University, Krakow, Poland.
    Sjöberg, Viktor
    Örebro universitet, Institutionen för naturvetenskap och teknik.
    Allard, Bert
    Örebro universitet, Institutionen för naturvetenskap och teknik.
    Karlsson, Stefan
    Örebro universitet, Institutionen för naturvetenskap och teknik.
    Potential use of native fungal strains for assisted uranium retention2015Inngår i: Minerals Engineering, ISSN 0892-6875, E-ISSN 1872-9444, Vol. 81, s. 173-178Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Uranium-stabilizing ligands can be useful complexing agents for uranium in aqueous solution. The discovery of novel ligand candidates for selective uranium capture in artificial and natural waters could provide scope for their use in water remediation and metal recovery from low- and high grade ores. In this study we used seven fungal strains, isolated from shale waste, to monitor the uranium retention capacity from an aqueous solution. After four weeks of incubation, suspensions containing the fungal strains were filtered, and up to 100% of the total uranium inventory was removed from a 10 mg L-1 solution. Approximately 70% of the total uranium removal is attributed to complexation and/or adsorption by particles in the malt extract and some 10% is adsorbed by the fungal biomass. The additional 20% uranium removed could be related to the excretion of fungal metabolites. From 58% to 90% of the uranium is removed within ten minutes. The formation of colloidal/particulate uranium is proposed to be controlled by organic ligands in the culture medium and organic ligands excreted by the fungi where phosphorus moieties seem to be important. Membrane fouling by the hydrocarbons is also suggested to contribute to a loss of uranium from the aqueous phase.

  • 47.
    Grawunder, A
    et al.
    Friedrich - Schiller - University, Jena, Germany.
    Meissner, S
    Friedrich - Schiller - University, Jena, Germany.
    Merten, D
    Friedrich - Schiller - University, Jena, Germany.
    Basilie, S
    Friedrich - Schiller - University, Jena, Germany.
    Karlsson, Stefan
    Örebro universitet, Institutionen för naturvetenskap och teknik.
    Allard, Bert
    Örebro universitet, Institutionen för naturvetenskap och teknik.
    Büchel, G
    Friedrich - Schiller - University, Jena, Germany.
    Origin of REE patterns in AMD-impacted areas2013Inngår i: Mineralogical magazine, ISSN 0026-461X, E-ISSN 1471-8022, Vol. 77, s. 1210-1210Artikkel i tidsskrift (Fagfellevurdert)
  • 48.
    Grawunder, Anja
    et al.
    Friedrich Sciller Univ., Jena, Germany.
    Schäffner, Franziska
    Friedrich Sciller Univ., Jena, Germany.
    Merten, Dirk
    Friedrich Sciller Univ., Jena, Germany.
    Büchel, Georg
    Friedrich Sciller Univ., Jena, Germany.
    Sjöberg, Viktor
    Örebro universitet, Akademin för naturvetenskap och teknik.
    Karlsson, Stefan
    Örebro universitet, Akademin för naturvetenskap och teknik.
    Allard, Bert
    Örebro universitet, Akademin för naturvetenskap och teknik.
    Rare earth elements distribution and fractionation in a former acidic shale pit lake2011Inngår i: / [ed] E. Kothe, G. Büchel, 2011, s. 44-44Konferansepaper (Fagfellevurdert)
  • 49.
    Greis, Christina
    et al.
    Örebro universitet, Institutionen för naturvetenskap.
    Duker, Anders
    Man-Technology-Environment Research Centre, Örebro University, Örebro, Sweden.
    Allard, Bert
    Örebro universitet, Institutionen för naturvetenskap.
    Roos, Per
    Department of Radiation Physics, Lund University Hospital, Lund, Sweden; Risø National Laboratory, Roskilde, Denmark.
    Holm, Elis
    Department of Radiation Physics, Lund University Hospital, Lund, Sweden; .
    Plutonium remobilization in a humic-rich lake2007Inngår i: Journal of Radioanalytical and Nuclear Chemistry, ISSN 0236-5731, E-ISSN 1588-2780, Vol. 277, nr 1, s. 265-268Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Fresh water from Lake Svartsjön, Sweden, was collected and four fractions were prepared: (1) adsorption on DEAE, (2) flocculation with Ca2+, (3) co-precipitation with Fe hydrous oxide and (4) co-precipitation with Mn hydrous oxide. The plutonium level in the lake is 65 fg/l (222 μBq/l), measured by ICP-QMS and ICP-SFMS. Pronounced accumulation in fractions (1) (34%) and (2) (66%), combined with observed levels of organic matter indicate that plutonium is predominantly associated with organic matter. Measurements of isotopic ratios indicate that 77% of the plutonium originates from weapons testing and the remaining appears to originate from the Chernobyl accident.

  • 50.
    Greis, Christina
    et al.
    Örebro universitet, Institutionen för naturvetenskap.
    Düker, Anders
    Pettersson, Håkan
    Karlsson, Stefan
    Allard, Bert
    Rapid method for ICP-MS analysis of plutonium in sediment samples2004Manuskript (preprint) (Annet vitenskapelig)
123 1 - 50 of 138
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