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Roles of chloride ion in photo-reduction/oxidation of mercury
  • ISSN号:1001-6538
  • 期刊名称:Chinese Science Bulletin
  • 时间:2014.9
  • 页码:3390-3397
  • 分类:O614.243[理学—无机化学;理学—化学] O644.12[理学—物理化学;理学—化学]
  • 作者机构:[1]Chongqing Key Laboratory of Soil Multi-scale Interfacial Process, College of Resource and Environment, Southwest University, Chongqing 400715, China, [2]School of Chemistry and Material, Guizhou Normal University, Guiyang 550001, China, [3]Chongqing Key Laboratory of Agricultural Resources and Environment, Chongqing 400716, China
  • 相关基金:Acknowledgments This work was supported by the National Basic Research Program of China (2013CB430004), and the National Natural Science Foundation of China (41173116, 41373113).
  • 相关项目:三峡水库消落区土壤汞的甲基化及其释放特征
中文摘要:

在水的系统的二价的水银(Hg (II )) 的光致还原在在地球表面环境水银(Hg ) 骑车的全球 biogeochemistry 起一个关键作用。有各种各样的 Cl 的这进程的机制 < 啜 class= “ a-plus-plus ” > 集中([Cl < 啜 class= “ a-plus-plus ” > 在不同 pH 值和照耀波长范围下面的 ]) 仍然是不清楚的。在这个工作,光致还原和相片氧化 Hg 试验与不同[Cl < 啜 class= “ a-plus-plus ” > 在各种各样的轻条件下面的 ] 和 pH 价值被进行。结果证明 Hg (II ) 的光致还原率常数与增加减少[Cl < 啜 class= “ a-plus-plus ” > 在在完整的轻光谱下面的中立答案的 ] 。有 Cl 的 Hg (II ) 的光致还原率常数 < 啜 class= “ a-plus-plus ” > 高度依赖于 Hg (II ) 种类,它是坚定的由[Cl < 啜 class= “ a-plus-plus ” >] 和 pH 价值。照耀波长范围面对 Cl 在 Hg (II ) 和 Hg (0 ) 的相片氧化的光致还原的反应过程上有重要效果 < 啜 class= “ a-plus-plus ” > 。当割掉时紫外(紫外)放射( 280400 ? nm ),没有 Cl ,减小率常数减少<啜class=“ a-plus-plus ”>,和增加与更高[ Cl <啜class=“ a-plus-plus ”>],和 Hg ( 0 )的相片氧化率减少与或没有 Cl <啜class=“ a-plus-plus ”>。除了 Cl < 啜 class= “ a-plus-plus ” > complexation 在答案稳定可约的 Hg 离子,相片氧化是为 Cl 的一个重要原因 < 啜 class= “ a-plus-plus ” > Hg (II ) 的 降低光致还原率。结果为与 Cl 理解 Hg (II ) 的相片氧化还原作用人物是很重要的 < 啜 class= “ a-plus-plus ” > 。

英文摘要:

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 irra- diation 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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