Dimethylmercury in Floodwaters of Mercury Contaminated Rice Paddies

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	Dimethylmercury in Floodwaters of Mercury Contaminated Rice Paddies
	Wang, Zhangwei ; Sun, Ting ; Driscoll, Charles T.; Zhang, Huan ; Zhang, Xiaoshan
刊名	ENVIRONMENTAL SCIENCE & TECHNOLOGY
	2019-08-20
卷号	53 期号:16 页码:9453-9461
ISSN号	0013-936X
英文摘要	Dimethyl mercury (CH3HgCH3, DMeHg) has been observed in upwelling marine environments and the deep ocean. However, little is known about the occurrence and mechanisms of DMeHg formation in freshwater environments. In this study, concentrations of dissolved gaseous DMeHg were investigated in floodwaters of rice paddies in China that have been contaminated by mercury from mining. Values of DMeHg in rice paddies were compared with measurements from nearshore surface seawater in the Bohai Gulf. High concentrations of dissolved gaseous DMeHg occurred in rice paddies. Average DMeHg concentration was 12 +/- 22 pg L-1 with range of 0.39 to 91 pg L-1 in rice paddies at Shuijing, China, a site impacted by an abandoned mercury mine. These concentrations are comparable to those previously observed in the deep seawater and coastal upwelling environments (2.3-115pg L-1). An alkaline environment was found to be necessary for DMeHg formation in rice paddies. Associated incubation experiments showed that production of DMeHg in paddy soil was limited by Hg availability. Although iron amendments accelerated the production of gaseous methylmercury (MeHg) species to floodwaters, available Hg2+ is crucial for this production in flooded rice paddies. These observations are the first to demonstrate the occurrence of DMeHg and reveal factors affecting DMeHg production in rice paddies. Given the high volatility of DMeHg, these measurements also suggest a source for observations of MeHg in atmospheric deposition and advance understanding of a potentially important aspect of the biogeochemical cycling of Hg.
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/43135]
专题	生态环境研究中心_大气环境科学实验室
作者单位	1.Syracuse Univ, Lepartment Civil & Environm Engn, 151 Link Hall, Syracuse, NY 13244 USA 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, Beijing 100085, Peoples R China
推荐引用方式 GB/T 7714	Wang, Zhangwei,Sun, Ting,Driscoll, Charles T.,et al. Dimethylmercury in Floodwaters of Mercury Contaminated Rice Paddies[J]. ENVIRONMENTAL SCIENCE & TECHNOLOGY,2019,53(16):9453-9461.
APA	Wang, Zhangwei,Sun, Ting,Driscoll, Charles T.,Zhang, Huan,&Zhang, Xiaoshan.(2019).Dimethylmercury in Floodwaters of Mercury Contaminated Rice Paddies.ENVIRONMENTAL SCIENCE & TECHNOLOGY,53(16),9453-9461.
MLA	Wang, Zhangwei,et al."Dimethylmercury in Floodwaters of Mercury Contaminated Rice Paddies".ENVIRONMENTAL SCIENCE & TECHNOLOGY 53.16(2019):9453-9461.