Diurnal characteristics of migration and transformation of mercury and effects of nitrate in Jialing River, Chongqing, China
文献类型： 外文期刊
作者： Sun, Rongguo 1 ; Wang, Dingyong 1 ; Mao, Wen 1 ; Ma, Ming 1 ; Zhang, Cheng 1 ; Jiang, Tao 1 ;
作者机构： 1.Southwest Univ, Coll Resource & Environm, Chongqing 400715, Peoples R China
2.Guizhou Normal Univ, Sch Chem & Mat, Guiyang 550001, Peoples R China
3.Chongqing Key Lab Agr Resources & Environm, Chongqing 400716, Peoples R China
关键词： Mercury cycling;Photo-degradation;Diffusive flux;Nitrate;Contribution-rate
期刊名称：CHEMOSPHERE （ 影响因子：8.1； 五年影响因子：7.7 ）
ISSN： 0045-6535
年卷期： 2015 年 119 卷
页码：
收录情况： SCI
摘要： Laboratory incubation experiments were performed to identify diurnal characteristics of migration and transformation of mercury (Hg) and effects of nitrate (NO3-, a hydroxyl radical donor by photolysis) in Jialing River, Chongqing, China. It is found that there are strong diurnal signals of [monomethylmercury (MMHg)] and [reactive Hg (RHg)] in sediment, pore water and overlying water, which suggest that solar radiation may be an important variable that involved in aquatic Hg cycling. Photo-degradation (PD) of MMHg plays a key role in Hg cycling in water systems, and the rates are measured to be 38.22% in March, 2012. The presence of NO3- has a marked effect on MMHg PD under solar radiation, and affects inorganic species reducting to Hg-0, resulting in more Hg species available for methylation. So NO3- is an important factor for Hg cycling in water systems. Diffusive flux of MMHg, RHg and dissolved Hg (DHg) are 1.92-2.34, 3.43-3.64 and 3.04-5.71 ng m(-2) d(-1) at daytime, and 6.04-6.92, 3.22-3.25 and 7.79-8.37 ng m(-2) d(-1) at nighttime, respectively, implying that sediment is a major Hg source for shallow-water area in Jialing River at springtime. These results show great importance for understanding Hg biogeochemical processes in clear, oligotrophic, shallow, sluggish, and agriculturally-impacted waters. (C) 2014 Elsevier Ltd. All rights reserved.
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