8%氟虫腈悬浮种衣剂在玉米和土壤中的残留研究及安全评价

为评价8%氟虫腈悬浮种衣剂在玉米和土壤使用后的生态环境安全性，建立8%氟虫腈悬浮种衣剂的科学合理使用规范，采用田间试验的方法，对8%氟虫腈悬浮种衣剂在玉米及土壤中的残留消解动态及最终残留量进行研究，应用Agilent 7890A气相色谱仪-电子捕获检测器测定氟虫腈在玉米和土壤中的残留量，并对其在玉米上的安全使用进行评价。消解动态试验结果表明：8%氟虫腈悬浮种衣剂用于拌种防治玉米田蛴螬，在土壤中的半衰期为2.7~3.9天，药后14天消解89%以上，半衰期较短，消解速度较快；在玉米植株中的半衰期为2.2~4.3天，药后9天消解78%以上，半衰期较短，消解速度较快。最终残留量试验结果表明，样品最终残留量均低于0.01 mg/kg，CAC规定玉米籽粒中氟虫腈的最大残留限量为0.01 mg/kg。建议8%氟虫腈悬浮种衣剂用于拌种防治玉米田蛴螬，施药剂量为18.75 g/kg制剂（有效成分1.5 g/kg）玉米种子，于玉米播种前拌种。

Residue and Application Safety Assessment of Fipronil 8% SD in Corn and Soil

It was to evaluate the ecological security and establish the regular use of fipronil 8% SD in corn and soil, field experiment was conducted to reveal residual degradation dynamics and the final residues of fipronil 8% SD in corn and soil. The residues of fipronil in corn and soil were determined by Agilent 7890A GC equipped with ECD, and application safety was assessed. The degradation dynamic test results showed that the half-live of fipronil in soil was 2.7-3.9 d, more than 89% degradation at 14th day after application, and the half-live of fipronil in corn was 2.2-4.3 d, more than 78% degradation at 9th day after application. The final residue tests showed that the final residue of fipronil were lower than 0.01 mg/kg in samples, CAC provided the maximum residue limit of fipronil in corn was 0.01 mg/kg. An 18.75 g/kg preparation (active ingredient 1.5 g/kg) corn seed was recommended for fipronil 8% SD in seed dressing to control grubs before corn seeding.