Residue dynamics and risk assessment of four pesticides in yellow peach
To clarify food safety and dissipation dynamics of four unregistered pesticides(procymidone,chlorantra-niliprole,emamectin benzoate and paclobutrazol)in yellow peach,the degradation dynamics and dietary risk assess-ment of these four pesticides in yellow peach were studied under two treatment methods of bagged and non-bagged.Based on liquid chromatography-tandem mass spectrometry(LC-MS/MS)technology,a simple and practical method was established to measure the residues of four unregistered pesticides in yellow peach.The mean recoveries of four pesticides in yellow peach were 75.6%-111.3%at spiking levels from 0.05 to 5.0 mg·kg-1(procymidone,chlo-rantraniliprole and paclobutrazol)and 0.001 to 0.05 mg·kg-1(emamectin benzoate)with relative standard deviation(RSD)of 0.9%-5.2%.The degradation of four pesticides in the yellow peach accorded with the first-order kinetic equation.Based on the results of pesticide residue and risk assessment,emamectin benzoate and paclobutrazol should be used on the yellow peach with a preharvest interval(PHI)of 14 days,and chlorantraniliprole should be used on the yellow peach with a PHI of 3 days at the recommended dose.Due to the slow degradation of procymi-done,it is not recommended to use procymidone in yellow peach.
万方数据
维普
