您好，欢迎访问重庆市农业科学院 机构知识库！

Photo-degradation of monomethylmercury in the presence of chloride ion

文献类型： 外文期刊

作者： Sun, Rongguo 1 ; Wang, Dingyong 1 ; Zhang, Yutao 1 ; Mao, Wen 1 ; Zhang, Tong 3 ; Ma, Ming 1 ; Zhang, Cheng 1 ;

作者机构： 1.Southwest Univ, Coll Resources & Environm, Minist Educ, Key Lab Three Gorges Reservoir Reg Ecoenvironm, Chongqing 400716, Peoples R China

2.Chongqing Key Lab Agr Resources & Environm, Chongqing 400716, Peoples R China

3.Woods Hole Oceanog Inst, Dept Ma

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 ）

ISSN：

年卷期：

页码：

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.

  • 相关文献

[1]Roles of chloride ion in photo-reduction/oxidation of mercury. Sun, Rongguo,Wang, Dingyong,Mao, Wen,Zhao, Shibo,Zhang, Cheng,Sun, Rongguo,Wang, Dingyong,Zhang, Cheng. 2014

[2]Diurnal characteristics of migration and transformation of mercury and effects of nitrate in Jialing River, Chongqing, China. Sun, Rongguo,Wang, Dingyong,Mao, Wen,Ma, Ming,Zhang, Cheng,Jiang, Tao,Sun, Rongguo,Wang, Dingyong,Zhang, Cheng,Jiang, Tao. 2015

作者其他论文 更多>>
置顶
购物车
反馈

© 京ICP备09089781号-29 主办单位：重庆市农业科学院

学术资源： 中国农业科学院 农业专业知识服务系统 农科联盟资源共建共享平台 中国农业科技文献与信息服务平台 中国农业期刊集成服务平台