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2.67×10-11cm3/(s.mol),以此估算了在大气中.OH自由基浓度为7×105mol/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.
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^-11cm^3/（ 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.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2006年第1期112-115,共4页
Chemical Journal of Chinese Universities
基金
国家杰出青年基金(批准号:49925513)
国家自然科学基金(批准号:2007001)
国家'九七三'计划(批准号:2002CB410802)资助
