Mass-dependent and -independent fractionation of Hg isotopes by photoreduction in aquatic systems
Mass-dependent and -independent fractionation of Hg isotopes by photoreduction in aquatic systems
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DOI：
10.1126/science.1148050
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发表时间：
2007-10-19
期刊：
影响因子：
56.9
通讯作者：
Blum, Joel D.
中科院分区：
文献类型：
--
作者：
Bergquist, Bridget A.;Blum, Joel D.
汞（Hg）同位素可作为环境中Hg地球化学途径的示踪剂。自然光对水溶液中汞的光化学还原导致汞同位素的质量相关分馏和奇数质量同位素的质量无关分馏，两种奇数质量同位素的质量无关分馏之间的关系对于不同的光还原途径是不同的。在鱼类中观察到的汞和微量迁移因子变化很大，这为了解汞在食物网中的来源和生物累积提供了新的视角。鱼类中的MIF也可用于估算水生生态系统中甲基汞通过光还原作用的损失。
Mercury (Hg) isotopes can be used as tracers of Hg biogeochemical pathways in the environment. The photochemical reduction of aqueous Hg species by natural sunlight leads to both mass-dependent fractionation (MDF) of Hg isotopes and mass-independent fractionation (MIF) of the odd-mass isotopes, with the relation between the MIF for the two odd isotopes being distinct for different photoreduction pathways. Large variations in MDF and MIF are observed in fish and provide new insights into the sources and bioaccumulation of Hg in food webs. MIF in fish can also be used to estimate the loss of methylmercury via photoreduction in aquatic ecosytems.