高效氯氟氰菊酯在玉米和土壤中的残留及消解动态

研究了济南和哈尔滨两年两地的玉米Zea maysL.经高效氯氟氰菊酯种子处理微囊悬浮剂拌种后,高效氯氟氰菊酯在玉米植株、籽粒和土壤中的最终残留量,以及在玉米植株和土壤中的降解动力学规律。结果表明,高效氯氟氰菊酯最终残留在植株、籽粒和土壤中的质量分数分别是〈0.005mg·kg-1、〈0.001mg·kg-1和≤0.053mg·kg-1;在土壤中的降解符合一级动力学方程,降解半衰期19.6～28.1d,消解速率哈尔滨慢于济南,这可能与土壤含水量和气温等有关。本研究为制定该农药在玉米上最大残留限量标准和合理使用准则以及风险评估提供了科学依据。

Residues and degradation of lambda-cyhalothrin in Zea mays L. and soil

Residues and degradation of Lambda-cyhalothrin in maize grains,the plants and soils were studied both in Jinan and Haerbin in two years,after the seeds were treated with Lambda-cyhalothrin capsule suspension for seed treatment.The residues in maize plant,grain and soil were not more than 0.005 mg·kg-1 ,0.001 mg·kg-1 and 0.053 mg·kg-1 respectively.The degradation of Lambda-cyhalothrin in soils followed the first-order kinetics.The half lives of Lambda-cyhalothrin in soils were 19.6～28.1 d.The rate of degradation in Haerbin were slower than which in Jinan,which probably related to the soil moisture and air temperature of the sites.The study provided scientific base for setting up the Maximum Residue Limit of the pesticide in maize,the guidance of safe application and the estimation of maximum residue level.