globalchange  > 气候减缓与适应
DOI: 10.1007/s10533-013-9924-3
Scopus记录号: 2-s2.0-84900798909
论文题名:
A Michaelis-Menten type equation for describing methylmercury dependence on inorganic mercury in aquatic sediments
作者: Cossa D.; Garnier C.; Buscail R.; Elbaz-Poulichet F.; Mikac N.; Patel-Sorrentino N.; Tessier E.; Rigaud S.; Lenoble V.; Gobeil C.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2014
卷: 119, 期:2018-01-03
起始页码: 35
结束页码: 43
语种: 英语
英文关键词: Aquatic sediment ; Demethylation ; Mercury ; Methylation ; Methylmercury
Scopus关键词: food chain ; mercury (element) ; methylmercury ; microbial community ; reaction kinetics ; sediment pollution
英文摘要: Methylation of mercury (Hg) is the crucial process that controls Hg biomagnification along the aquatic food chains. Aquatic sediments are of particular interest because they constitute an essential reservoir where inorganic divalent Hg (HgII) is methylated. Methylmercury (MeHg) concentrations in sediments mainly result from the balance between methylation and demethylation reactions, two opposite natural processes primarily mediated by aquatic microorganisms. Thus, Hg availability and the activity of methylating microbial communities control the MeHg abundance in sediments. Consistently, some studies have reported a significant positive correlation between MeHg and HgII or total Hg (HgT), taken as a proxy for HgII, in aquatic sediments using enzyme-catalyzed methylation/demethylation mechanisms. By compiling 1,442 published and unpublished HgT-MeHg couples from lacustrine, riverine, estuarine and marine sediments covering various environmental conditions, from deep pristine abyssal to heavily contaminated riverine sediments, we show that a Michaelis-Menten type relationship is an appropriate model to relate the two parameters: MeHg = aHgT/(K m + HgT), with a = 0.277 ± 0.011 and K m = 188 ± 15 (R 2 = 0.70, p < 0.001). From K m variations, which depend on the various encountered environmental conditions, it appears that MeHg formation and accumulation are favoured in marine sediments compared to freshwater ones, and under oxic/suboxic conditions compared to anoxic ones, with redox potential and organic matter lability being the governing factors. © 2013 Springer Science+Business Media Dordrecht.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83683
Appears in Collections:气候减缓与适应
气候变化事实与影响

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作者单位: IFREMER, BP 330, 83507 La Seyne-sur-Mer, France; ISTerre, Université J. Fourier, BP 53, 38041 Grenoble, France; PROTEE, Université de Toulon, EA 3819, 83957 La Garde, France; CEFREM-CNRS-UMR 5110, Université de Perpignan, 52 Avenue P. Alduy, 66860 Perpignan, France; Laboratoire Hydrosciences, UMR CNRS, Universités Montpellier I and II, Place E. Bataillon, CC MSE, 34095 Montpellier Cedex 5, France; Center for Marine and Environmental Research, Ruder Bošković Institute, PO Box 1016, 10000 Zagreb, Croatia; Cerege, Aix-Marseille Université, Europole Méditerranéen de l'Arbois, BP 80, 13545 Aix-en-Provence Cedex 04, France; INRS-ETE, Université du Québec, 490 de la Couronne, QC, QC, G1K 9A9, Canada

Recommended Citation:
Cossa D.,Garnier C.,Buscail R.,et al. A Michaelis-Menten type equation for describing methylmercury dependence on inorganic mercury in aquatic sediments[J]. Biogeochemistry,2014-01-01,119(2018-01-03)
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