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Assessment of levels, speciation and toxicity of trace metal contaminants in selected shallow groundwater sources, surface runoff, wastewater and surface water from designated streams in Lake Victoria Basin, Uganda
KTH, School of Architecture and the Built Environment (ABE). Makerere University and Kyambogo University. (Water and Environmental Enginering)ORCID iD: 0000-0003-0000-7328
KTH, School of Architecture and the Built Environment (ABE), Land and Water Resources Engineering (moved 20130630), Environmental Geochemistry and Ecotechnology. KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering. (Water and Environmental Engineering)ORCID iD: 0000-0001-8491-4675
KTH, School of Architecture and the Built Environment (ABE). Department of Civil Engineering, CEDAT, Makerere University. (Water and Environmental Engineering)
2019 (English)In: Hindawi Journal of Environmental and Public Health, ISSN 1687-9813, p. 1-18, article id 6734017Article in journal (Refereed) Published
Abstract [en]

The levels, speciation of elements and toxicity of selected trace metals as well as other parameters in selected surface water, shallow groundwater sources, landfill leachate and associated surface runoff in the Lake Victoria basin, Uganda were studied. The WHO guidelines, Ugandan standards, Canadian guidelines and Swedish EPA were used for assessment. The shallow groundwater was acidic with pH values below 6.5. The pH, dissolved organic carbon, flouride and suphate levels for all springs were below the guideline values although 52.8% were contaminated with nitrates while 39% were contaminated with chloride ions. The water samples with had levels of major elements; iron, chromium, aluminium and manganese above the guideline values. Speciation studies showed that 74% of the metal ions were bound to dissolved organic matter in surface water whereas in landfill leachates the dorminant ionic species were metal hydroxides or fluvic acid bound. Risk analysis basing on the Swedish EPA showed that varied risks of negative effects in 30% – 76% of the sample sites ranging from high to increased risk in surface water whereas the results from Bio-met tool showed potential risk to toxicity effects of Cu2+, Ni2+, Zn2+and Pb2+ in 15.3% - 30.8% surface water samples and 8.3% - 62.5% groundwater samples.

Place, publisher, year, edition, pages
Adam House, Third Floor 1 Fitzroy Square London W1T 5HF UK, 2019. p. 1-18, article id 6734017
Keywords [en]
Guideline values, Lake Victoria basin, speciation, trace metals, toxicity effects
National Category
Engineering and Technology
Research subject
Land and Water Resources Engineering
Identifiers
URN: urn:nbn:se:kth:diva-259916DOI: 10.1155/2019/6734017Scopus ID: 2-s2.0-85066991774OAI: oai:DiVA.org:kth-259916DiVA, id: diva2:1353711
Note

QC 20190926

Available from: 2019-09-23 Created: 2019-09-23 Last updated: 2019-09-26Bibliographically approved

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