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	Methylation of inorganic mercury by methylcobalamin in aquatic systems
	Chen, Baowei; Wang, Thanh; Yin, Yongguang; He, Bin; Jiang, Guibin
	2007
会议名称	7th International Conference on Environmental and Biological Aspects of Main-Group Organometals (ICEBAMO)
会议日期	2006
会议地点	Heraklion, GREECE
关键词	methylation inorganic mercury methylmercury methylcobalamin pH salinity electrophile reaction
英文摘要	The methylation of inorganic Hg(II) by methylcobalamin in aquatic systems was studied using high-performance liquid chromatography coupled with UV-digestion cold vapor atomic fluorescence spectrometry (HPLC-UV-CV AFS). Monomethylmercury (MMC) could be positively identified as the reaction product in the aqueous solution. The salinity and pH of the aquatic system have great effects on the formation of MMC, because they could change the species of the reactants in the solution. From an electrophile reaction point of view, salinity and pH alter the electron density of the methyl donor and the electrophilicity of metal ion in the reaction system. This methylation of inorganic Hg(II) is shown to be possible even in highly saline solutions, which indicates its importance in aquatic environments. Kinetic experiments showed that the methylation reaction was fast and first-order for Hg(II). The first-order reaction rate was determined to be 0.00612 and 0.000287 min(-1) for pH 5.0 and 1.5, respectively. It is suggested that this methylation could occur in the absence of enzymes, in which Hg(II) acts as an electrophile to attack methylcobalamin with a subsequent transfer of carbanion methyl group to the higher oxidized state of Hg(II). Copyright (c) 2007 John Wiley & Sons, Ltd.
ISSN号	0268-2605
内容类型	会议论文
源URL	[http://ir.rcees.ac.cn/handle/311016/24729]
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	Chen, Baowei,Wang, Thanh,Yin, Yongguang,et al. Methylation of inorganic mercury by methylcobalamin in aquatic systems[C]. 见:7th International Conference on Environmental and Biological Aspects of Main-Group Organometals (ICEBAMO). Heraklion, GREECE. 2006.

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