研究论文
陈宗懋.35种化学农药光解速率的比较研究[J].环境科学学报,1985,5(1):70-84
35种化学农药光解速率的比较研究
- A COMPARATIVE STUDY OF THIN FILM PHOTODEGRADATIVE RATES FOR 35 PESTICIDES
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- 作者
- 单位
- 陈宗懋
- 中国农业科学院茶叶研究所
- 摘要：对35种化学农药(包括有机氯、有机磷、氨基甲酸酯、三均氮类和拟除虫菊酯类)呈固态时的光解速率进行了比较,列举了在三种不同浓度(0.67、3.3、6.7μg/cm2)下的光解速率常数(k)和半衰期(HL50),并就农药在玻片上分子层排列的厚度对光解速率常数的变化进行了讨论,还进行了不同农药在295-305nm波长范围内的消光系数(ε)与光解速率间关系的研究,结果表明两者无明显相关.
- Abstract：The photodegradative rate constant and half-life for 35 pesticides (including orgaaochlorine, organophosphorus, carbamate, triazine and pyrethroid pesticides) at three concentration levels (0.67, 3.3 and 6.7μg/ cm2)were determined at the environmentally important wavelengths. The rate constants range from 265.2 ± 12.8× 10-7s-1(Dichlorvos, 0.67μg/cm2) to 9.3 ± 1.2× 10-7s-1 (p,p'-DDE, 0.67μg/cm2). The rate constants began to decrease when concentration of the pesticides on glass plates reached a certain level. The mechanism for variation of the rate constant was discussed from the view point of the thickness of pesticide molecular layer on the plates.There were found no significant relationships between the extinction coefficients at 295-305nm and the photodegradation rate for the pesticides.
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