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化学学报
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化学学报 ›› 2006, Vol. 64 ›› Issue (5): 363-366.    下一篇

研究论文

液相OH•, NO3•和SO4•-与二甲基硫反应机理

房豪杰，郑璐，张仁熙，侯惠奇*   

  1. (复旦大学环境科学研究所 上海 200433)
  • 投稿日期:2005-06-15 修回日期:2005-11-16 发布日期:2006-03-15
  • 通讯作者: 侯惠奇

Reaction Mechanism of OH•, NO3• and SO4•- with Dimethylsulfide in Liquid Phase

FANG Hao-Jie,ZHENG Lu,ZHANG Ren-Xi, HOU Hui-Qi*   

  1. (Environmental Science Institute, Fudan University, Shanghai 200433)
  • Received:2005-06-15 Revised:2005-11-16 Published:2006-03-15
  • Contact: HOU Hui-Qi

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利用激光闪光光解技术研究了液相二甲基硫(DMS)与OH•, NO3•和SO4•-自由基的微观反应机理. 实验结果表明: 在pH 5～9时, OH•氧化DMS生成DMSOH•, DMSOH•会与DMS反应生成(DMS)2+; 而NO3•和SO4•-;会直接氧化DMS生成DMS＋, 生成的DMS＋会与DMS反应生成(DMS)2+.(DMS)2+与氧气的反应很慢, 它的衰减受pH影响较大.

关键词: 激光闪光光解, 液相, 二甲基硫

The laser flash photolysis technique was employed to study the reactions of dimethylsulfide (DMS) with OH•, NO3• and SO4•- radicals in solution. During pH 5～9, OH• reacted with DMS to form DMSOH• radical, which then reacted with another DMS molecule to form(DMS)2+, however, the oxidation by NO3• and SO4•- radicals proceeded via one-electron oxidation to form DMS＋, which could also react with another DMS molecule to form(DMS)2+. The decay of (DMS)2+ ion was greatly influenced by the pH and its reaction with oxygen was immeasurably slow.

Key words: laser flash photolysis, liquid phase, dimethylsulfide