| 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 |
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| 引用本文： | 韩蕾,朱彤,孙凤龙,尚静.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[J].高等学校化学学报,2006,27(1):112-115. |
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| 作者姓名： | 韩蕾 朱彤 孙凤龙 尚静 |
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| 作者单位： | 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 |
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| 基金项目： | 国家自然科学基金;中国科学院资助项目;科技部科研项目 |
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| 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.
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| 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 |
| 文章编号： | 0251-0790(2006)01-0112-04 |
| 收稿时间： | 2004-12-06 |
| 修稿时间： | 2004年12月6日 |
Gas-phase Reaction of Herbicide 2-Methyl-4-chlorophenoxy Acetic Acid(MCPA) with (.O)H Radicals |
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| HAN Lei,ZHU Tong,SUN Feng-Long,SHANG Jing.Gas-phase Reaction of Herbicide 2-Methyl-4-chlorophenoxy Acetic Acid(MCPA) with (.O)H Radicals[J].Chemical Research In Chinese Universities,2006,27(1):112-115. |
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| Authors: | HAN Lei ZHU Tong SUN Feng-Long SHANG Jing |
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| Institution: | State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences, Peking University, Beijing 100871, China |
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| 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. |
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| Keywords: | Herbicide 2-Methyl 4 chlorophenoxy acetic acid(MCPA) OH radical Reaction rate constant |
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