Species-specific stable isotope fractionation of mercury during Hg(II) methylation by an anaerobic bacteria (Desulfobulbus propionicus) under dark conditions

Environmental Science & Technology
Pablo Rodríguez-GonzálezDavid Amouroux

Abstract

This work reports the first results on the stable isotope fractionation of Hg during methylation by anaerobic bacteria under dark conditions. The GC-MC-ICPMS methodology employed is capable of simultaneously measuring the species-specific isotopic composition of different Hg species within the same sample. We have studied Hg isotopic fractionation caused by methylation of Hg(II) standard reference material NIST-3133 in the presence of the pure bacterial strain Desulfobulbus propionicus MUD10 (DSM 6523) under fermentative conditions. We have measured the isotopic composition of Hg(II) and monomethyl mercury (MMHg) in these cultures as a function of time and calculated delta-values for both species versus the starting material (NIST-3133) as a delta-zero standard. Two different strategies for the incubation were applied: single sampling cultures and a continuous sampling culture. The results obtained have shown that under the conditions employed in this work the methylation of Hg(II) causes mass-dependent fractionation of the Hg isotopes for both Hg(II) substrate and produced MMHg. Such a process occurred under the exponential growth of the bacteria which preferentially methylate the lighter isotopes of Hg. After 96 h for the con...Continue Reading

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Citations

May 2, 2012·Environmental Science & Technology·Vincent PerrotDavid Amouroux
May 23, 2012·Environmental Science & Technology·Martin JiskraRuben Kretzschmar
Oct 5, 2012·Environmental Science & Technology·Martin Tsz Ki TsuiYabing H Nollet
Mar 8, 2013·Environmental Science & Technology·Laura S ShermanNiladri Basu
Apr 26, 2011·Applied and Environmental Microbiology·Cynthia C GilmourJudy D Wall
Jan 21, 2016·Environmental Science & Technology·Patrick Michael DonovanMartin Tsz Ki Tsui
Jan 7, 2016·Frontiers in Microbiology·John W MoreauEric E Roden
Jun 15, 2015·The Science of the Total Environment·Sae Yun KwonMartin Tsz-Ki Tsui
Dec 14, 2011·Mass Spectrometry Reviews·Pablo Rodríguez-GonzálezOlivier F X Donard
Mar 17, 2015·Environmental Science and Pollution Research International·Marisol Goñi-UrrizaRémy Guyoneaud
May 29, 2016·The Science of the Total Environment·Patrick M DonovanMartin T K Tsui
Jan 13, 2015·Environmental Research·Laura S ShermanJoseph DiGangi
Aug 15, 2015·Scientific Reports·Asha RaniRavi Ranjan
May 10, 2017·Environmental Science & Technology·Sarah E RothenbergAlexis Donohue
Mar 10, 2018·Environmental Science. Processes & Impacts·Jason D DemersBaohua Gu
Aug 10, 2017·Environmental Toxicology and Chemistry·Martin Tsz-Ki TsuiSteven J Balogh
Feb 2, 2018·Environmental Science. Processes & Impacts·Carluvy Baptista-SalazarHarald Biester
Oct 30, 2013·Environmental Science. Processes & Impacts·Rusty D DayStephen A Wise
Dec 14, 2019·Analytical and Bioanalytical Chemistry·Tylor J RoseraJames P Hurley
Jul 9, 2020·Nature Communications·Ruoyu SunCongqiang Liu
Apr 11, 2018·MBio·Cynthia C GilmourDwayne A Elias
Nov 11, 2020·The Science of the Total Environment·Marina RenedoDavid Amouroux

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