吡嘧磺隆在稻田环境中的消解动态研究

Degradation Dynamics of Pyrazosulfuron-ethyl in Paddyfield

选取湖南和北京两地的水稻田为试验对象,于2011、2012年采用液相色谱法研究了吡嘧磺隆在稻田环境中的消解动态。结果表明,吡嘧磺隆在稻田环境样品中的最低检出限为0.01 mg/kg;当添加浓度在0.01~1.00 mg/kg时,平均回收率范围在83.68%~101.9%;其消解动态符合一级化学反应动力学方程C t=C0e-kt,在两个地点的两年试验中,吡嘧磺隆在稻田水、稻田土壤和水稻植株中的平均半衰期分别为2.29、2.73、2.29 d。

The paddyfields located in Hunan province and Beijing city were selected as experimental objects to study the degradation dynamics of pyrazosulfuron-ethyl in it. The results showed that the minimum detection limit of pyrazosulfuronethyl in paddyfield sample was 0.01 mg/kg; when adding concentration was 0.01 ~1.00 mg/kg, the average recovery rate ranged from 83.68% to 101.9%; the degradation dynamics of pyrazosulfuron-ethyl accorded with the first order chemical reaction kinetic equation Ct= C0e-kt, the average half-life of pyrazosulfuron-ethyl in paddyfield water, paddyfield soil and rice plant was 2.29, 2.73 and 2.29 d, respectively.