Photo-degradation of monomethylmercury in the presence of chloride ion

文献类型： 外文期刊

第一作者： Sun, Rongguo

作者： Sun, Rongguo;Wang, Dingyong;Zhang, Yutao;Mao, Wen;Ma, Ming;Zhang, Cheng;Wang, Dingyong;Zhang, Cheng;Zhang, Tong

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关键词： Chloride ion;Monomethylmercury;Photo-degradation;Light radiation intensity;Wavelength

期刊名称：CHEMOSPHERE （ 影响因子：8.1； 五年影响因子：7.7 ）

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收录情况： SCI

摘要： Photo-degradation (PD) of monomethylmercury (MMHg) is recognized as the most important process in mercury cycling that maintains MMHg at low concentration in water systems. Chloride ion (Cl~-) is pres-ent widely in ecosystems and it may have an effect on MMHg PD. In this investigation, MMHg PD with various Cl~ concentrations under different light radiation intensity and wavelength were performed in a quartz cylinder reactor. Various light radiations were obtained from xenon and ultraviolet (UV) bulbs. The results showed that the first order reaction coefficient decreased (1.35-0.37 h~(-1)) with Cl~- concentra-tions, and increased (0.14-0.76 h~(-1)) with UV-B radiation intensity. The wavelength mediated PD rates varied from 0.29 h~(-1) to 0.96 h~(-1). The peak emission of Hg° was excited by UV-B radiation and Hg° flux of the reactions without Cl~- (94.06 ng) was higher than that with Cl~- by 1-4 times. All the results suggest that Cl~- could block MMHg PD and subsequently influence the end products from PD. The wavelength and light intensity have a significant effect on MMHg PD and Hg° emission. Calculation of MMHg species (%) at initial and terminal time with various Cl~- concentrations show that MMHg species changed by Cl~- complexation and thus result in different PD mechanisms and pathways.

分类号： X5

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