Mass-independent fractionation of even mercury isotopes

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• 作者：Hongming Cai ; Jiubin Chen
• 关键词：Mass ; independent fractionation ; Even mercury isotopes ; Processes producing even ; MIF ; Mechanisms triggering even ; MIF ; Self ; shielding ; Neutron capture ; 偶数汞同位素 ; 非质量分馏
分馏机制 ; 分馏过程 ; 自屏蔽效应 中子捕获
• 刊名：Chinese Science Bulletin
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：61
• 期：2
• 页码：116-124
• 全文大小：826 KB
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• 作者单位：Hongming Cai (1) (2)
  Jiubin Chen (1)
  
  1. State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, 550081, China
  2. University of Chinese Academy of Sciences, Beijing, 100049, China
  
• 刊物主题：Science, general; Life Sciences, general; Physics, general; Chemistry/Food Science, general; Earth Sciences, general; Engineering, general;
• 出版者：Springer Berlin Heidelberg
• ISSN：1861-9541

文摘

Practically all physical, chemical, and biological processes can induce mass-dependent fractionation of mercury (Hg) isotopes. A few special processes such as photochemical reduction of Hg(II) and photochemical degradation of methylmercury (MeHg) can produce mass-independent fractionation (MIF) of odd Hg isotopes (odd-MIF), which had been largely reported in variable natural samples and laboratory experiments, and was thought to be caused by either nuclear volume effect or magnetic isotope effect. Recently, intriguing MIF of even Hg isotopes (even-MIF) had been determined in natural samples mainly related to the atmosphere. Though photo-oxidation in the tropopause (inter-layer between the stratosphere and the troposphere) and neutron capture in space were thought to be the possible processes causing even-MIF, the exact mechanism triggering significant even Hg isotope anomaly is still unclear. Even-MIF could provide useful information about the atmospheric chemistry and related climate changes, and the biogeochemical cycle of Hg. Keywords Mass-independent fractionation Even mercury isotopes Processes producing even-MIF Mechanisms triggering even-MIF Self-shielding Neutron capture