几种农药在露地黄瓜上的残留降解动态检测研究

研究了在露地黄瓜栽培中。喷施毒死蜱、甲氰菊酯、氯氰菊酯、吡虫啉、百菌清、甲基硫菌灵和王铜等农药的残留降解动态。结果表明，不同农药在黄瓜果实中的残留量和降解速度有很大差异。在杀虫剂中．甲氰菊酯在喷药后第1d的残留量最大，其后的降解速度较快；毒死蜱残留量位居第二，其降解速度比较稳定；氯氰菊酯在喷药后第1d的残留量超过标准．但第3d以后就检测不到其残留：吡虫啉在施药后第1d的残留量最低，降解速度也比较稳定。在杀菌剂中．甲基硫菌灵的降解速度较快，百菌清和王铜的降解速度较慢。无论是杀虫剂还是杀菌剂，施药后在黄瓜上的残留量随喷药时间的推移而减少。

Residue Dynamics of Pesticides in Ridge Cucumber

The degradation dynamics of pesticide residues in ridge cucumber were investigated The results of determination indicated that the residue and degradation for various pesticides was different. The residue of fenpropathrin but the rate of degradation was faster MRL after 1 day, it was not detected than its MRL 1 day after application, was the largest in all the pesticides tested after 1 day, in the later. Although cypermethrin residue was over the 3 days after application. Chlorpyrifos residue was lower but the rate of degradation was slow. Imidacloprid was similar as chlorpyrifos. For fungicides, the degradation rate of thiophanate-methyl was faster than chlorothalonil and copper-oxychloride.