Mass-dependent and -independent fractionation of Hg isotopes by photoreduction in aquatic systems

被引：778

作者：

Bergquist, Bridget A. ^{[1
]}

Blum, Joel D. ^{[1
]}

机构：

[1] Univ Michigan, Dept Geol Sci, Ann Arbor, MI 48109 USA

来源：

SCIENCE | 2007年 / 318卷 / 5849期

关键词：

D O I：

10.1126/science.1148050

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

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.

引用

页码：417 / 420

页数：4

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