异甲·特丁净乳油在花生和土壤中的残留动态及安全性评价

目的]探讨异丙甲草胺和特丁净在花生上的残留特性和安全风险。方法]通过田间试验及室内检测研究50%异甲·特丁净乳油在花生和土壤中的残留消解动态及最终残留量。结果]50%异甲·特丁净乳油按施药剂量为2 250、3 750 g a.i./hm~2,于花生播后苗前土壤喷施1次,收获期的异丙甲草胺和特丁净在花生植株、花生壳、花生仁中的残留量均未检出(异丙甲草胺残留量0.05 mg/kg,特丁净残留量0.01 mg/kg)。异丙甲草胺在土壤中的半衰期为11.6~14.8 d,药后30 d消解90%以上;特丁净在在土壤中的半衰期为12.1~14.7 d,药后30 d消解87%以上。总的来说,异丙甲草胺和特丁净在土壤中半衰期较短,消解速度较快。结论]试验结果为异丙甲草胺·特丁净在花生上的安全合理使用提供了理论依据。

Residue Degradation and Safety Assessment of Metolachlor and Terbutryn in Peanut and Soil

Objective] The aim was to research the residue degradation and safety risk of metolachlor and terbutryn in peanut.Method] Field experiment and laboratory testing were conducted to reveal residual degradation dynamics and the final residues of metolachlor and terbutryn in peanut and soil.Result] The final residue tests showed that metolachlor and terbutryn 50％ was sprayed on the soil for one time in the peanut pre-emergence at application dose 2 250 and 3 750 g a.i./hm2,metolachlor and terbutryn in the harvested plant,shell,peanut were lower than the limit of quantification (LOQ) of 0.05 mg/kg and 0.01 mg/kg,respectively.The half-live of metolachlor in soil was 11.6-14.8 d,terbutryn in soil was 12.1-14.7 d,and the residue degradation rate of metolachlor and terbutryn in soil was after application for 30 days was above 90％ and 87％ respectively.In general,metolachlor and terbutryn had a relatively short half-life in the soil,and the residue degradation was faster.Conclusion] The research results provide scientific basis for the rational and safe use of metolachlor and terbutryn in peanut.