Possible alkylation of inorganic Hg(II) by photochemical processes in the environment

CORC > 生态环境研究中心 > 中国科学院生态环境研究中心 > 环境化学与生态毒理学国家重点实验室

	Possible alkylation of inorganic Hg(II) by photochemical processes in the environment
	Yin, Yongguang ; Chen, Baowei ; Mao, Yuxiang ; Thanh Wang ; Liu, Jingfu ; Cai, Yong ; Jiang, Guibin
刊名	CHEMOSPHERE
	2012
卷号	88 期号:1 页码:8－16
关键词	Methylmercury Chemical methylation UV irradiation Low-molecular-weight organic compounds
ISSN号	0045-6535
中文摘要	The methylation of inorganic Hg by anaerobic bacteria in aquatic environments is considered to be the major pathway for methylmercury (MeHg) production. However, recent research has suggested that abiotic or chemical methylation by humic substances and other low-molecular-weight organic compounds in natural environments is also possible. Here, the aqueous photo-transformation of Hg2+ to organomercurials was investigated in the presence of ketones, aldehydes and low molecular weight organic acids under UV irradiation. MeHg and/or ethylmercury (EtHg) were identified as the main organomercurial products by multiple analytical techniques, including chromatography-atomic spectrometry and molecular mass spectrometry and further confirmed by stable isotope tracer experiments. The yield of organomercurials was markedly influenced by pH, NaCl concentration, alkylation donor concentration and the presence of chelating ligands in the aqueous solution. Electron paramagnetic resonance spectrometry demonstrated that the radical reaction was not the predominating alkylation pathway, although methyl radicals were detected in the photo-alkylation procedure. A mechanism based on intra-molecular alkyl transfer in the Hg2+-low-molecular-weight organic compound complex is proposed. The present work helps us better understand of MeHg and EtHg photo-generation in natural environments. (C) 2012 Published by Elsevier Ltd.
WOS记录号	WOS:000304235700002
公开日期	2014-11-04
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/7752]
专题	生态环境研究中心_环境化学与生态毒理学国家重点实验室
推荐引用方式 GB/T 7714	Yin, Yongguang,Chen, Baowei,Mao, Yuxiang,et al. Possible alkylation of inorganic Hg(II) by photochemical processes in the environment[J]. CHEMOSPHERE,2012,88(1):8－16.
APA	Yin, Yongguang.,Chen, Baowei.,Mao, Yuxiang.,Thanh Wang.,Liu, Jingfu.,...&Jiang, Guibin.(2012).Possible alkylation of inorganic Hg(II) by photochemical processes in the environment.CHEMOSPHERE,88(1),8－16.
MLA	Yin, Yongguang,et al."Possible alkylation of inorganic Hg(II) by photochemical processes in the environment".CHEMOSPHERE 88.1(2012):8－16.