田间条件下虫螨腈在菜苔中的残留消解及膳食风险评估

Residue Dissipation and Dietary Risk Assessment of Chlorfenapyr in Flowering Chinese Cabbage under Field Conditions

[目的]明确虫螨腈在菜苔中的残留消解情况及对人体的膳食摄入风险。[方法]采用田间试验的方法,对虫螨腈在菜苔中的残留消解及最终残留量进行研究。[结果]消解动态试验结果表明:虫螨腈在北京和山东2地菜苔中半衰期分别为2.8、7.5 d。按照112.5、168.75 g a.i./hm2用量,喷雾施药2~3次,施药间隔7 d,距末次施药后间隔3 d采样,菜苔中虫螨腈的最大残留量为8.93 mg/kg,残留中值为2.03 mg/kg。以此为基础对虫螨腈进行长期膳食摄入风险评估。虫螨腈在菜苔中的长期膳食摄入风险商(RQ)为0.098 28;虫螨腈在所有登记作物中的总膳食摄入风险商(RQ)为0.456 40。[结论]膳食风险均在可接受范围,说明虫螨腈在菜苔中残留不会对我国人体健康产生影响。

[Aims] This study aims to confirm the residue dissipation of chlorfenapyr in flowering Chinese cabbage and the dietary risk in flowering Chinese cabbage.[Methods] Field experiment was conducted to reveal residual degradation dynamics and the final residues of chlorfenapyr in flowering Chinese cabbage.[Results] The degradation dynamic test results showed that the half-live of chlorfenapyr in flowering Chinese cabbage was 2.8 and 7.5 a from Beiing and Shandong,respectively.The ultimate residues of chlorfenapyr in flowering Chinese cabbage were determined after the application at levels of 112.5 and 168.75 g a.i./ha for 2-3 times usage with application frequency of 7 days,with the maximum residue 8.93 mg/kg and the median residue 2.03 mg/kg in flowering Chinese cabbage 3 d after treatment On this basis,the long-term dietary exposure risk of chlorfenapyr was assessed.The risk quotients(RQ) for chlorfenapyr in flowering Chinese cabbage were 0.098 28.The total RQ values for chlorfenapyr in all registered crops were 0.456 40.[Conclusions] Based on this analysis,chlorfenapyr residues in flowering Chinese cabbage would not affect the health of the general population in China.