【摘要】 采用HPLC-DAD方法对吡虫啉在金银花及土壤中的残留动态进行研究。该方法最小检出量为0.021 2 ng,样品添加回收率为80.9%~84.6%,变异系数为7.74%~18.15%。研究结果表明:吡虫啉在金银花和土壤中的半衰期分别为1.52~4.65、11.07~19.09 d。建议金银花中吡虫啉的最大残留限量(MRL)为3.0 mg/kg;10%吡虫啉可湿性粉剂防治金银花蚜虫,用药量为30 g/hm2(有效成分),采用喷雾的施药方法,在每茬花中最多施药2次,安全施药间隔期为7 d。更多还原

【Abstract】 HPLC-DAD was developed to study the residual dynamics and the final residues of imidacloprid in honeysuckles and soils.The lowest detection limit of this method was 0.021 2 ng.The recovery of imidacloprid added to honeysuckle and soil samples ranged from 80.9% to 84.6% with a coefficient of variation of 7.74% to 18.15%.The results showed that the degradation half life of imidacloprid was 1.52-4.65 d in honeysuckles and 11.07-19.09 d in soils.It was suggested that the MRL of imidacloprid in honeysuckles was 3.0 mg/kg.When 10% imidacloprid WP was applied to control the aphids on honeysuckles at 30 g/hm2(effective ingredients),one or two times of applications were allowed during each flowering period,with the safe interval of seven days from harvest.更多还原