24%辛·烟·氯氟吡OD在玉米及其土壤中的消解动态与残留

Dissipation Dynamics and Residues of Bromoxynil Octanoate+Nicosulfuron+Fluroxypyr 24% OD in Corn and Soil

样品采用乙腈振荡提取，固相萃取柱分离、净化，气相色谱电子捕获检测器（ECD）进行检测，外标法定量。结果表明：在玉米植株中，辛酰溴苯腈和氯氟吡氧乙酸的半衰期分别为0．6～1．3d和0．8～1．5d；在土壤中，辛酰溴苯腈和氯氟吡氧乙酸的半衰期分别为1．5~2．7d和0．8～0．9d。玉米与土壤中辛酰溴苯腈的最终残留量均低于0．002mg／kg，氯氟吡氧乙酸的最终残留量均低于0．005mg／kg。

Samples were extracted by acetonitrile and cleaned up by solid phase extraction column, then detected by GC-ECD. The results showed that the half-lives of bromoxynil octanoate and fluroxypyr were 0.6-1.3 d and 0.8-1.5 d in corn plant, the half-lives in soil were 1.5-2.7 d and 0.8-0.9 d. The final residues of bromoxynil octanoate in corn and soil were less than 0.002 mg/kg, and the final residues of fluroxypyr in corn and soil were less than 0.005 mg/kg.