油菜体内及土壤中咪鲜胺的残留检测与消解动态

Study on residue detection and degradation of prochloraz in rapeseed and soil

采用固相萃取（SPE）-高效液相色谱紫外检测（HPLC—UV）建立了油菜中咪鲜胺的残留量检测方法，并进行咪鲜胺消解动态研究。提取液经石墨碳和C18固相萃取柱净化、浓缩后测定。咪鲜胺在各样品中的添加回收率为80．1％-91．8％，变异系数为1．8％-9．6％。咪鲜胺在油菜中消解较快，半衰期为4—6d；30g制剂／666．7m^2于油菜盛花期施药2次，油菜收获时，油菜籽中咪鲜胺残留量最高为0．20mg／kg，土壤中咪鲜胺残留量最高为0．49mg／kg。

Residue detection and degradation of prochloraz 50% WP in rapeseed and soil were investigated and its residue was determined with HPLC - UV. After distilling and cleaning - up with SPE tubes of the samples, prochloraz was then detected. The fortified recovery of prochloraz was 80.1% - 91.8% , with a CV of 1.8% - 9.6%. The results obtained from two date groups showed that the degradation of prochloraz in rapeseed was fast, with a half- life of only 4 - 6 days. After 30 days, only the samples from high dosage of application contained prochloraz with the highest amount of 0.20 and 0.49mg/kg in rapeseed and soil, respectively.