An method of residue analysis and residue dynamics of flusilazole in pear and soil were studied. Samples were ex- tracted from pear and soil with acetonitrile,and cleaned up by PSA, then determined by HPLC with UV detector. The minimum detectable quantity of flusilazole was 9.8ng, the minim umdetectable concentration of the method was 9.8× 10^-3 mg/kg. The recoveries ranged from 85.0% to 105.0% with a RSD of 2.6%-7.4% in pear, from 80.0% to 108.0% with a RSD of 1.5% -11.4% in soil at three spiked levels of 0.02-0.2mg/L. The result showed that flusilazole degraded rapidly in the pear, but lowly in the soil relatively. The half life of flusilazole in the former was 5.6-13. 1d and in the latter was 5.7-31.4 d. And the last application was done in the 21st day before harvesting, the residue of flusilazole in the harvested pear was lower than 0. 2 mg/ kg,demonstrating that it was safe to apply flusilazole in pear with the recommended rate.%研究了氟硅唑在梨和土壤中的残留分析方法及其残留动态。样品用乙腈提取，PSA分散吸附剂吸附净化，液相色谱一紫外测定。氟硅唑的最小检出量为9．8ng，方法的最低检出浓度为9．8×10-3mg／kg。在0．02～0．2mg／L添加水平下，梨中的回收率85．0％～105．0％，相对标准偏差2．6％～7．4％；土壤中的回收率80．0％～108．0％；相时标准偏差1．5％～11．4％，符合农残分析要求。试验结果表明，氟硅唑在梨中消解较快，土壤中相对缓慢，半衰期分别为5．6～13．1d和5．7～31．4d。末次施药距收获间隔21d，梨中氟硅唑残留量均低于0．2mg／kg，该药按推荐剂量使用是安全的。
展开▼
