Residue and Degradation Dynamics of Chlorpyrifos in Mixed Agent in Rice and Paddy Field
WANG Hongjun
CHEN Yan
Abstract：In order to discuss the residue and degradation dynamics of 25% isoprocarb and chlorpyrifos EC in rice and paddy filed,this study had used the measurement technique of GC-NPD to determine the residues of chlorpyrifos in rice and paddy field,so as to provide scientific basis for the reasonable usage of this agent in rice and paddy.The results showed that the curve of residue dynamics of chlorpyrifos in water,soil and plants accorded with the first-order kinetics equation,and the half-lives of chlorpyrifos were 1.45-3.48 d in water,3.16-6.36 d in soil,2.05-2.98 d in plants,respectively.The final residues of chlorpyrifos in soil,brown rice,husk and plants,increased correspondingly with the increase of spraying dosage and times,and decreased accordingly with the prolonging of sampling time.When 25% isoprocard and chlorpyrifos EC was applied 3 or 4 times at recommended dosage and 1.5 times recommended dosage in rice field,over 33 days after the last application,the final residues maximum of chlorpyrifos were 0.044 7 mg/kg and 0.081 2 mg/kg in soil,0.045 4 mg/kg and 0.076 5 mg/kg in brown rice,0.084 3 mg/kg and 0.093 6 mg/kg in husk,0.047 9 mg/kg and 0.063 2 mg/kg in plants,respectively,which all were below the maximum residue limit(MRL) 0.5 mg/kg of rice in China,and the rice harvested at this time was safe for human consumption.
Keywords：chlorpyrifosricepaddy fieldresidue and degradation dynamics
Publication Date：2017-01-01
Online Publishing Date：2026-09-12(First online date of this platform, not the publication date of the document)
Pages：7( 100-106 )