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

第一作者: Sun, Rongguo

作者: Sun, Rongguo;Wang, Dingyong;Mao, Wen;Ma, Ming;Zhang, Cheng;Jiang, Tao;Sun, Rongguo;Wang, Dingyong;Zhang, Cheng;Jiang, Tao

作者机构:

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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