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Photodegradation of methylmercury in Jialing River of Chongqing, China

文献类型： 外文期刊

作者： Sun, Rongguo 1 ; Wang, Dingyong 1 ; Mao, Wen 1 ; Zhao, Shibo 1 ; Zhang, Cheng 1 ;

作者机构： 1.Southwest Univ, Chongqing Key Lab Soil Multiscale Interfacial Pro, 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： Methylmercury;Photodegradation;Jialing River;Flux;Influencing factors

期刊名称：JOURNAL OF ENVIRONMENTAL SCIENCES （ 影响因子：5.9； 五年影响因子：5.6 ）

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收录情况： SCI

摘要： Photodegradation (PD) of methylmercury (MMHg) is a key process of mercury (Hg) cycling in water systems, maintaining MMHg at a low level in water systems. However, we possess little knowledge of this important process in the Jialing River of Chongqing, China. In situ incubation experiments were thus performed to measure temporal patterns and influencing factors of MMHg PD in this river. The results showed that MMHg underwent a net demethylation process under solar radiation in the water column, which predominantly occurred in surface waters. For surface water, the highest PD rate constants were observed in spring (12 x 10(-3) +/- 1.5 x 10(-3) m(2)/E), followed by summer (9.0 x 10(-3) +/- 1.2 x 10(-3) m(2)/E), autumn (1.4 x 10(-3) +/- 0.12 x 10(-3) m(2)/E), and winter (0.78 x 10(-3) +/- 0.11 x 10(-3) m(2)/E). UV-A radiation (320-400 nm), UV-B radiation (280-320 nm), and photosynthetically active radiation (PAR, 400-700 nm) accounted for 43%-64%, 14%-31%, and 16%-45% of MMHg PD, respectively. PD rate constants varied substantially with the treatments that filtered the river water and amended it with chemicals (i.e., Cl-, NO3-, dissolved organic matter (DOM), Fe(III)), which reveals that suspended particulate matter and water components are important factors in affecting the PD process. For the entire water column, the PD rate constant determined for each wavelength range decreased rapidly with water depth. UV-A, UV-B, and PAR contributed 27%-46%, 6.2%-12%, and 42%-65% to the PD process, respectively. PD flux was estimated to be 4.7 mu g/(m(2).year) in the study site. Our results are very important to understand the cycling characteristics of MMHg in the Jialing River of Chongqing, China. (C) 2015 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.

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