Abiotic Reduction of Mercury(II) in the Presence of Sulfidic Mineral Suspensions
Abiotic Reduction of Mercury(II) in the Presence of Sulfidic Mineral Suspensions
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DOI：
10.3389/fenvc.2021.660058
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发表时间：
2021-06-14
影响因子：
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通讯作者：
Mason, Robert P.
中科院分区：
文献类型：
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作者：
Coulibaly, Mariame;Mazrui, Nashaat M.;Mason, Robert P.
一甲基汞 (CH3Hg) 是一种神经毒性污染物，可在水生食物网中生物放大。在沉积物中，CH3Hg 的产生取决于汞 (Hg) 甲基化细菌的细菌活性和生物可利用的无机二价汞 (Hg-II) 的量。 Hg-II 生物和非生物还原为元素汞 (Hg-0) 可能会限制沉积物中可用于甲基化的 Hg-II 库，从而限制 CH3Hg 的产生量。因此，有关 Hg-II 转化的知识对于了解有毒且具有生物累积性的 CH3Hg 的产生至关重要。在这里，我们使用与环境相关的低 Hg 浓度和 Hg-II:FeS(s) 比率，研究了在溶解铁和溶解有机物 (DOM) 存在的情况下硫化矿物（FeS(s) 和 CdS(s)）对 Hg-II 的还原作用。我们的结果表明，Mackinawite (FeS(s)) 对 Hg-II 的还原较低（
Monomethylmercury (CH3Hg) is a neurotoxic pollutant that biomagnifies in aquatic food webs. In sediments, the production of CH3Hg depends on the bacterial activity of mercury (Hg) methylating bacteria and the amount of bioavailable inorganic divalent mercury (Hg-II). Biotic and abiotic reduction of Hg-II to elemental mercury (Hg-0) may limit the pool of Hg-II available for methylation in sediments, and thus the amount of CH3Hg produced. Knowledge about the transformation of Hg-II is therefore primordial to the understanding of the production of toxic and bioaccumulative CH3Hg. Here, we examined the reduction of Hg-II by sulfidic minerals (FeS(s) and CdS(s)) in the presence of dissolved iron and dissolved organic matter (DOM) using low, environmentally relevant concentrations of Hg and ratio of Hg-II:FeS(s). Our results show that the reduction of Hg-II by Mackinawite (FeS(s)) was lower (