Residues and Dietary Risk Assessment of Clothianidin,Chlorfenapyr and Its Metabolite in Welsh Onion
[Objective]To evaluate the residual digestion and dietary intake risks of clothianidin and chlorfenapyr in welsh onion.[Method]By conducting standardized field residue tests and considering the residual levels of clothianidin and chlorfenapyr in welsh onion,the long-term di-etary intake risks of clothianidin and chlorfenapyr were evaluated.[Result]The half-lives of clothianidin and chlorfenapyr in welsh onion were 4.6-7.4 and 5.8-6.9 d,respectively,indicating faster degradation.The results of long-term dietary risk assessment indicated that the risk quo-tients(RQ)of clothianidin and chlorfenapyr in the general population were 5%and 84%,respectively,indicating that the risk of dietary intake was acceptable.[Conclusion]At the recommended dosage,the residues of clothianidin and chlorfenapyr in welsh onion have no effect on human health.