关键词: 香蕉, 土壤, 氯氰菊酯, 残留, 降解动态, 安全性评价

Abstract: The degradation dynamics of cypermethrin in bananas and its orchard were studied by using GC and field experiment. The results showed that the original sediment of cypermethrin in bananas was relatively lower. The rule of cypermethrin degradation in bananas and the soil were well-fitted with first-order kinetics. On one hand, two different application doses share the same degradation coefficient, T1/2 ranged from 12.1 d to 12.88 d and T0.99 ranged from 80.3 d to 85.1 d in bananas. On the other hand, in the soil T1/2 and T0.99 were 8.0 d, 52.9 d respectively. Furthermore, after applying for 62～70 d, the residue of cypermethrin in banana orchard was less than 0.01 mg/kg. The application of cypermethrin into bananas according to the regular method in Fujian, which is an effective dose of 56.25 g/hm2, was applied continually with an interval of 7 d. So it meaned that more than 7 d can be recommended as pre-harvest time. The quality safety of their products was fulfill quality requirements of NY/T 750-2011.

Key words: banana, soil, cypermethrin, residual, degradation dynamics, safety assessments