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Analysis of Polycyclic Aromatic Hydrocarbons in Freshwater Snails of Family Lymnaeidae from Patholmsviken
Örebro University, School of Science and Technology.
2015 (English)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

Polycyclic aromatic compounds (PAHs) are a group of organic compounds that are very stable and therefore persistent. They can be pyrogenic or petrogenic and PAHs from petrogenic sources are often enriched with alkylated PAHs while pyrogenic sources often contain more of the parent PAH. In Patholmsviken, a bay located near an abandoned woodimpregnating facility, freshwater snails were collected and analysed for PAH16, alkylated PAHs, oxy-PAHs and azaarenes using GC/MS. The concentrations of PAH16 were compared with previous analyses and the results showed that the levels had declined since 2008 and 2013. The ratio between alkylated PAHs and native PAH coincide with what could be expected from a creosote source which consist of more native PAHs. Only one oxy-PAH could be detected and the levels of alkylated PAHs were low. Freshwater snails seem to be a good bioindicator since they meet many of the desired criteria for a suitable biomonitoring organism.

Abstract [sv]

Polycykliska aromatiska föreningar (PAH) är en grupp av organiska föreningar som är mycket stabila och därmed långlivade. De kan vara pyrogena eller petrogena, de petrogena källorna är ofta berikad med alkylerade PAHer medan de pyrogena källorna oftare innehåller mer av icke-substituerade PAHer. I Patholmsviken, en vik som ligger bredvid en nedlagd träimpregneringsanläggning, har snäckor samlats in och analyserats för PAH16, alkylerade PAHer, oxy-PAHer och azaarener med hjälp av GC/MS. Koncentrationerna av PAH16 jämfördes med värden från två tidigare analyser och resultaten visade att nivåerna hade minskat sedan 2008 och 2013. Endast en oxy-PAH kunde detekteras och nivåerna av alkylerade PAHer var låga. De låga nivåerna av alkylerade PAH överensstämmer med vad som kan förväntas hitta från en kreosotkälla som avger pyrogena PAHer. Snäckor verkar vara lämpliga att använda som bioindikatorer eftersom de uppfyller många av de kriterier som finns för dessa.

Place, publisher, year, edition, pages
2015.
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:oru:diva-46338OAI: oai:DiVA.org:oru-46338DiVA: diva2:865731
Subject / course
Chemistry
Supervisors
Examiners
Available from: 2015-10-29 Created: 2015-10-29 Last updated: 2017-10-17Bibliographically approved

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