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Roles of chloride ion in photo-reduction/oxidation of mercury

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, Coll Resource & Environm, Chongqing Key Lab Soil Multiscale Interfacial Pro, 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;Photo-reduction;Photo-oxidation;Chloride ion;Wavelength

期刊名称：CHINESE SCIENCE BULLETIN （ 影响因子：1.649； 五年影响因子：1.738 ）

ISSN： 1001-6538

年卷期： 2014 年 59 卷 27 期

页码：

收录情况： SCI

摘要： Photo-reduction of divalent mercury (Hg(II)) in aquatic systems plays a key role in global biogeochemistry cycling of mercury (Hg) in the Earth's surface environment. The mechanisms of this process with various Cl- concentrations ([Cl-]) under different pH values and irradiation wavelength ranges are still unclear. In this work, photo-reduction and photo-oxidation experiments of Hg with different [Cl-] and pH values under various light conditions were conducted. The results show that photo-reduction rate constants of Hg(II) decrease with the increasing of [Cl-] in neutral solution under full light spectrum. Photo-reduction rate constants of Hg(II) with Cl- is highly dependent on Hg(II) species, which is determined by [Cl-] and pH value. Irradiation wavelength ranges have significant effects on reaction processes of photo-reduction of Hg(II) and photo-oxidation of Hg(0) in the presence of Cl-. When cut off ultraviolet (UV) radiation (280-400 nm), the reduction rate constants decrease without Cl-, and increase with higher [Cl-], and the photo-oxidation rates of Hg(0) decrease with or without Cl-. Except Cl- complexation stabilize the reducible Hg ions in solutions, photo-oxidation is an important reason for Cl- lowering photo-reduction rate of Hg(II). The results are of great importance for understanding the photo-redox characters of Hg(II) with Cl-.

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