高等学校化学学报 ›› 2006, Vol. 27 ›› Issue (1): 112-115.

• 研究论文 • 上一篇    下一篇


除草剂2-甲基-4-氯苯氧乙酸(MCPA)与OH自由基的气相化学反应

韩蕾, 朱彤, 孙凤龙, 尚静   

  1. 环境模拟与污染控制国家联合重点实验室, 北京大学环境学院, 北京 100871
  • 收稿日期:2004-12-06 出版日期:2006-01-10 发布日期:2006-01-10
  • 通讯作者: ZHU Tong, E-mail: tzhu@pku.edu.cn
  • 基金资助:

     国家杰出青年基金(批准号: 49925513)、 国家自然科学基金(批准号: 2007001)和国家“九七三”计划(批准号: 2002CB410802)资助.

Gas\|phase Reaction of Herbicide 2-Methyl|4|chlorophenoxy Acetic Acid(MCPA) with OH Radicals

 HAN Lei, ZHU Tong, SUN Feng-Long, CHANG Jing   

  1. State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences, Peking University, Beijing 100871, China
  • Received:2004-12-06 Online:2006-01-10 Published:2006-01-10
  • Contact: 朱彤(1962年出生), 男, 博士, 长江特聘教授, 博士生导师, 从事大气化学研究. E-mail: tzhu@pku.edu.cn

摘要:

采用长光程气体池结合傅里叶变换红外光谱仪测得了除草剂2-甲基|4|氯苯氧乙酸(MCPA)与·OH自由基在23 ℃时的反应速率常数为2.67×10-11  cm3/(s*mol), 以此估算了在大气中·OH自由基浓度为 7×105  mol/cm3时, MCPA与·OH自由基反应导致的大气寿命为14.9 h. 结果表明, 在大气环境中MCPA较容易降解, 不会通过大气输送对环境造成广泛和持久性污染. 

关键词:  除草剂; 2-甲基-4-氯苯氧乙酸(MCPA); ·OH自由基; 反应速率常数

Abstract:

The investigations about the atmospheric degradation of organic herbicides became more and more important in China.  In our present research, the rate constant of the reaction of 2-methyl-4-chlorophenoxy acetic acid(MCPA) with OH radicals was measured by a long path quartz reactor connecting with Fourier Transform Infrared Spectroscopy(FTIR).  At 23 ℃ and under one atmosphere, the rate constant was determined to be 2.67×10-11 cm3/(s*mol), the atmospheric life time of MCPA was estimated to be 14.9 h.  The results show that MCPA can be degraded in  atmosphere and is not feasible to cause wide\|spreading and persisting pollution through long range atmospheric transport.

Key words: Herbicide; 2-Methyl, 4, chlorophenoxy acetic acid(MCPA); OH radical; Reaction rate constant

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