Residue and safety evaluation of 5 diamide insecticides in soybean-maize strip compound planting
[Aims]The aim of this study was to verify the safety of 5 diamide insecticides in soybean-maize strip compound planting.[Methods]The analysis method of 5 insecticides in soybean and maize substrates was established and the field trial samples were analyzed.Compared with the established maximum residue limit and combined with long-term dietary risk assessment model in China,the application of 5 insecticides in soybean-maize strip compound planting field was evaluated.[Results]At 3 adding levels,the average recoveries and relative standard deviations(RSD)of 5 diamide insecticides in soybean and maize substrates were 77％-114％and 1％-14％,respectively.The limit of quantitation(LOQ)of the five insecticides in soybean,green bean,maize and fresh maize was 0.02 mg/kg,and 0.05 mg/kg in soybean straw and maize straw.The residues of 5 insecticides in soybean straw and maize straw were＜0.05-1.5 and＜0.05-1.2 mg/kg,respectively.The results of dietary assessment showed that the long-term dietary risk(％ADI)of tetrachlorantraniliprole,tetraniliprole,broflanilide,cyantraniliprole and chlorantraniliprole in soybean and maize were 2.00％,0.67％,0.59％,9.33％and 0.18％,respectively,which were all less than 100％.The cumulative intake risk hazard index(HI)of the five insecticides was 12.77％,which was also less than 100％,indicating that the dietary intake risk to the general population was acceptable.[Conclusions]The application safety of 5 diamide insecticides in soybean-maize strip compound planting is relatively high.The results of this study provide data support for the safe use and registration of diamide insecticides in soybean and maize fields.
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