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Role of settling pa...
Role of settling particles on mercury methylation in the oxic water 1 column of freshwater systems
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- Gascon Diez, Elena (författare)
- Univ Geneva, Dept FA Forel Environm & Water Sci, Blvd Carl Vogt 66, CH-1211 Geneva 4, Switzerland
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- Loizeau, Jean-Luc (författare)
- Univ Geneva, Dept FA Forel Environm & Water Sci, Blvd Carl Vogt 66, CH-1211 Geneva 4, Switzerland
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- Cosio, Claudia (författare)
- Univ Geneva, Dept FA Forel Environm & Water Sci, Blvd Carl Vogt 66, CH-1211 Geneva 4, Switzerland
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- Bouchet, Sylvain (författare)
- Univ Pau & Pays Adour, Lab Chim Analyt Bioinorgan & Environm, Inst Sci Analyt & Physicochim Environm & Mat, CNRS,UMR 5254, Helioparc, F-64053 Pau, France
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- Adatte, Thierry (författare)
- Univ Lausanne, Inst Earth Sci ISTE, CH-1015 Lausanne, Switzerland
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- Amouroux, David (författare)
- Univ Pau & Pays Adour, Lab Chim Analyt Bioinorgan & Environm, Inst Sci Analyt & Physicochim Environm & Mat, CNRS,UMR 5254, Helioparc, F-64053 Pau, France
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- Bravo, Andrea G. (författare)
- Uppsala universitet,Limnologi
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(creator_code:org_t)
- 2016-10-13
- 2016
- Engelska.
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Ingår i: Environmental Science and Technology. - : American Chemical Society (ACS). - 0013-936X .- 1520-5851. ; 50:21, s. 11672-11679
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- As the methylation of inorganic divalent mercury (HgII) to neurotoxic methylmercury (MeHg) has been attributed to the activity of anaerobic bacteria, the formation of MeHg in the oxic water column of marine ecosystems has puzzled scientists over the past years. Here we show for the first time that MeHg can be produced in particles sinking through oxygenated water column of lakes. Total mercury (THg) and MeHg concentrations were measured in settling particles and in surface sediments of the largest freshwater lake in Western Europe (Lake Geneva). Whilst THg concentration differences between sediments and settling particles were not significant, MeHg concentrations were up to ten-fold greater in settling particles. MeHg demethylation rate constants (kd) were of similar magnitude in both compartments. In contrast, Hg methylation rate constants (km) were one order of magnitude greater in settling particles. The net potential for MeHg formation, assessed by the ratio between the two rate constants (km kd-1), was therefore up to ten times higher in settling particles, denoting that in situ transformations likely contributed to the high MeHg concentrations found in settling particles. Hg methylation was inhibited ( 80 %) in settling particles amended with molybdate, demonstrating the prominent role of biological sulfate-reduction in the process.
Ämnesord
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Oceanografi, hydrologi och vattenresurser (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Oceanography, Hydrology and Water Resources (hsv//eng)
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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