25%氟节胺乳油在烟草和土壤中的消解动态研究

Study on the Degradation Dynamics of 25% Prime+250E Residue in Soil and Tobacco

摘要: 样品用石油醚提取,混合柱净化,气相色谱电子捕获检测器检测。平均回收率为90.3%~96.4%。最小检出浓度分别为0.005mg/kg (土壤),0.01mg/kg (鲜叶),0.025mg/kg (干叶)。在施药后10d、20d采集烟叶和土壤样品分析,残留量均低于10mg/kg,在施药后30d采集样品分析,残留量均低于3mg/kg,低于规定的MRL值(20mg/kg)。

Abstract: Samples of soil and tobacco were extracted with petroleum ether, and separated with mixed Florisile column.Prime+250E was detected by gas chromatography with a ⁶³Ni electron capture detector.The average recovery varied from 90.3% to 96.4%.The minimum detectable concentration was 0.005mg/kg(soil), 0. 01mg/kg(fresh tobacco leaves), 0.025 mg/kg(dry tobacco leaves).The concentrations of Prime+250E residue in soil and tobacco leaves were less than 10 mg/kg after 10 days and 20 days, and 3mg/kg after 30 days.All of them were less than the MRL value (20mg/kg).