Dissipation,residue and dietary risk assessment of beta-cypermethrin-pyriproxyfen in Chinese kale
The study aimed to confirm the residue dissipation and the dietary risk of beta-cypermethrin and pyriproxyfen in Chinese kale.Based on good agricultural practices and analytical methods,residue levels of beta-cypermethrin and pyriproxyfen were determined in Chinese kale.Long-term and short-term dietary intake risk assessment of beta-cypermethrin and pyriproxyfen were evaluated based on the date of food consumption and weight data of different gender/age groups in dietary structure studies.Good linear relationships were presented in the range of 0.01-1.0 mg/L and 0.005-1.0 mg/L,respectively,and the coefficient of determination(R2)were above 0.996 7.The average recoveries of the pesticides in the Chinese kale with three spiked levels varied from 70.6％to 113.4％,with relative standard deviations(RSDs)of 0.5％-8.5％.The limit of qualification(LOQ)was 0.01 mg/kg.Residue experiments of beta-cypermethrin·pyriproxyfen 10％microemulsion(ME)in Chinese kale were carried out with each high recommended dosage.The dissipations of beta-cypermethrin and pyriproxyfen were followed first-order kinetic equations.The degradation half-lives were 3.9-10.1 days and 4.8-6.3 days,respectively.The final residues of beta-cypermethrin and pyriproxyfen in Chinese kale were lower than 0.094 mg/kg and 0.202 mg/kg,respectively,after 3,5,7,10 days of the last application.For dietary exposure risk assessments,the maximum value of the risk of chronic exposure under different Chinese ages was 27.26％and the maximum value of the risk of acute exposure was 67.17％,and both below 100％.It indicated that the agents of beta-cypermethrin·pyriproxyfen 10％ME sprayed on Chinese kale at the recommended dosages had no unacceptable potential risks for Chinese consumers.
Chinese kalebeta-cypermethrinpyriproxyfenrisk assessment of dietary residue intake
万方数据
维普
