甘蓝及其土壤中灭幼脲的残留检测与消解动态研究

Residue Detection and Degradation of Chlorbenzuron in Cabbage and Soil

建立了杀虫剂灭幼脲在甘蓝及其土壤中残留量的高效液相色谱检测方法。样品经提取和固相萃取（SPE）小柱净化后进行测定，灭幼脲的回收率为77．1％～81．6％，变异系数在4．3％～9．7％之间。残留动态研究表明，灭幼脲在甘蓝及其土壤中消解的半衰期分别为4～6d和15～16d；以20g制剂／亩的剂量（最高推荐剂量）施药14d后收获时，甘蓝中最高残留量为0．38mg／kg，土壤中最高残留量为0．28mg／kg。

Residue detection and degradation of 25% slurry chlorbenzuron in cabbage and soil were investigated and its residue was determined with high-performance liquid chromatography. A simple method based on small column solid phase extraction was developed to extract the chlorbenzuron from cabbage and soil, and then determined by high performance liquid chromatography（SPE-HPLC）. The recoveries of chlorbenzuron for the spiked samples were in the range of 77. 1%～81.6%,and the CVs were 4.3%～9. 7%. The results obtained from four groups of cultured experiments showed that the halflife of chlorbenzuron was 446 days in cabbage and 15～16 days in the soil. Whereas, the residue in cabbage was 0.38 mg/kg and 0.28 mg/kg in soil after 14 days with a recommended usage of 20 g/mu of 25% slurry chlorbenzuron in the cabbage field.