毒死蜱在苹果和土壤中的残留动态及安全性评价

Residue Dynamics and Safety Evaluation of Chlorpyrifos in Apple and Soil

通过田间试验和室内检测,研究了毒死蜱在苹果及土壤中的残留动态及最终残留量。结果表明:毒死蜱在苹果中的半衰期为6.9～8.0 d,药后21 d消解87%以上。毒死蜱在土壤中的半衰期为4.8～6.2 d,药后14 d消解87%以上。毒死蜱40%微乳剂以267、400.5 mg a.i./kg,施药3、4次,末次施药后14 d收获的苹果中毒死蜱残留量均低于1 mg/kg。推荐该药在苹果上的安全间隔期为14 d。

The field experiment and laboratory testing were conducted to reveal the degradation dynamics and the final residues of chlorpyrifos in apple and soil. The results showed that the half - life of ehlorpyrifos was 6.9 - 8.0 days and 4.8 -6.2 days in apple and soil respectively, and over 87% degraded on the 21st day in apple and on the 14th day in soil after application. When sprayed 3-4 times with 267 mga. i./kg and 400.5 mg a. i./kg chlorpyrifos 40% ME, and the last application was 14 days before harvesting, the residue of ehlorpyrifos in apple was lower than 1 mg/kg （ MRL）, and 14 days were recommended as the preharvest interval of chlorpyrifos for apple.