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Species-specific isotope tracers to study the accumulation and biotransformation of mixtures of inorganic and methyl mercury by the microalga Chlamydomonas reinhardtii
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
2014 (English)In: Environmental Pollution, ISSN 0269-7491, E-ISSN 1873-6424, Vol. 192, 212-215 p.Article in journal (Refereed) Published
Abstract [en]

The present study demonstrates that species-specific isotope tracing is an useful tool to precisely measure Hg accumulation and transformations capabilities of living organisms at concentrations naturally encountered in the environment. To that end, a phytoplanktonic green alga Chlamydomonas reinhardtii Dangeard (Chlamydomonadales, Chlorophyceae) was exposed to mixtures of (199)-isotopically enriched inorganic mercury ((IHg)-I-199) and of (201)-isotopically enriched monomethylmercury ((CH3Hg)-C-201) at a concentration range between less than 1 pM to 4 nM. Additionally, one exposure concentration of both mercury species was also studied separately to evaluate possible interactive effects. No difference in the intracellular contents was observed for algae exposed to (IHg)-I-199 and (CH3Hg)-C-201 alone or in their mixture, suggesting similar accumulation capacity for both species at the studied concentrations. Demethylation of (CH3Hg)-C-201 was observed at the highest exposure concentrations, whereas no methylation was detected.

Place, publisher, year, edition, pages
2014. Vol. 192, 212-215 p.
National Category
Natural Sciences
URN: urn:nbn:se:uu:diva-230404DOI: 10.1016/j.envpol.2014.05.013ISI: 000339774200026OAI: oai:DiVA.org:uu-230404DiVA: diva2:740418
Available from: 2014-08-25 Created: 2014-08-25 Last updated: 2014-10-07Bibliographically approved

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