摘要
采用气相色谱法及田间试验方法,研究敌敌畏、溴氰菊酯、三氟氯氰菊酯在香蕉上的残留动态。结果表明,在香蕉上的原始沉积量,敌敌畏>溴氰菊酯>三氟氯氰菊酯,同一农药的原始沉积量与施用量密切相关。敌敌畏在香蕉上消解迅速,在施药1 d后消解率均在80%以上,施药后3 d的残留量≤0.005 mg/kg。溴氰菊酯、三氟氯氰菊酯在香蕉上的残留消解动态符合一级动力学方程,溴氰菊酯推荐剂量为C=0.129 8×e-0.1201t,加倍剂量为C=0.248 9×e-0.114 5t,半衰期(T1/2)为5.8～6.1 d,消解99%所需要时间(T0.99)为38.4～40.3 d;三氟氯氰菊酯推荐剂量为C=0.033 9×e-0.070 0t,加倍剂量为C=0.070 7×e-0.069 5t,T1/2为9.9～10.0 d,T0.99为65.8～66.3 d。敌敌畏、溴氰菊酯、三氟氯氰菊酯在距第2次(末次)施药后60～70 d,香蕉产品的最终残留量均分别<0.005 mg/kg、<0.01 mg/kg、<0.008 mg/kg。
The residual dynamics of dichlorvos, deltamethrin and cyhalothrin in bananas were studied by the methods of the GC and the field experiment. Results indicated that the original sediment of the pesticides in bananas followed the order of dichlorvos 〉dehamethrin〉 cyhalothrin, which were closely related to their application dosage about the same pesticide. Dichlorvos could be dissipated rapidly, and the dissipation rate seemed all above 80% after applying 1 d and the residual contents were less than 0.005 mg/kg after applying 3 d. The residual degradation dynamics of deltamethrin and cyhalothrin in bananas could be followed first order kinetic equation. The equations of deltamethrin residual dynamics of the decommended and double dosage were C=0.129 8xe^0.01201t, and C=0.248 9Xe^-0.1145t, respectively, with T1/2 and TQ99 ranged from 5.8 d to 6.1 d, from 38.4 d to 40.3 d, respectively; and the equations of cyhalothrin residual dynamics of the decommended and double dosage were C=0.033 9xe^-0.0700t, and C=0.070 7xe^-0.0695t respectively, with T1/2 and TQ99 ranged from 9.9 d to 10.0 d, from 65.8 d to 66.3 d respectively. The final residue of dichlorvos, deltamethrin and cyhalothrin was below 0.005 mg/kg, 0.01 mg/kg and 0.008 mg/kg separately 60-70 d after the second application. If dichlorvos, deltamethrin and eyhalothrin were applied scientifically and safely during banana production, the products quality was safe.
出处
《热带作物学报》
CSCD
2011年第5期951-955,共5页
Chinese Journal of Tropical Crops
基金
福建省农业科技计划重点项目(2007N0067)
