香料烟中2种菊酯农药的残留降解动态

连续2a的消解动态表明,2.5%溴氰菊酯乳油和2.5%高效氯氟氰菊酯乳油在香料烟叶中的降解符合一级动力学消解模式,其半衰期分别为5.28～5.73d和7.05～8.98d,施药后30d残留量分别在0.012 8mg/kg和0.358 2mg/kg以下,降解率达95%以上。最终残留试验表明,2.5%溴氰菊酯乳油和2.5%高效氯氟氰菊酯乳油按其推荐剂量分别作2次和3次2种施药处理,采收间隔期15d后,香料烟中的最终残留量分别低于0.307 8 mg/kg和0.762 1 mg/kg,均低于溴氰菊酯和高效氯氟氰菊酯在烟草中的最大残留限量(MRL值)。

Dynamics of residues and degradation of two chrysanthemum ester pesticides in oriental tabacco

Results of two continuous years on the dynamics of residues and degradation showed that the degradation of 2.5% deltamethrin EC and 2.5% lambda-cyhalothrin EC fitted with level dynamics degradation model with the half-life period ranged from 5.28 to 5.73 days and 7.05 to 8.98 days,respectively.30 days after spraying,the amount of residues were 0.012 8 milligram per kilogaram and 0.358 2 milligram per kilogaram.The rate of degradation reached higher than 95%.The residues experiment showed that when 2.5% deltamethrin EC and 2.5% lambda-cyhalothrin EC,2 times and 3 times treatments,after 15 days interval of revovery was recommended,the residues in oriental tobacco were lower than 0.307 8 milligram per kilogram and 0.762 1 milligram per kilogaram,which lower 0.5 milligram per kilogaram and 5 milligram per kilogaram that the maximum residues limit of deltamethrin and lambda-cyhalothrin in tobacco.