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《Acta Scientiae Circumstantiae》 1985-01
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A COMPARATIVE STUDY OF THIN FILM PHOTODEGRADATIVE RATES FOR 35 PESTICIDES

Chen Zongmao (Research Institute of Tea, Chinese Academy of Agricultural Sciences)  
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-l(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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