8种农药在韭菜中的残留结果分析

Analysis of residual results of 8 pesticides in Allium tuberosum Rottler ex Sprengle

为了评价腐霉利、毒死蜱、高效氯氟氰菊酯、氯氰菊酯、异菌脲、啶虫脒、辛硫磷和阿维菌素等8种农药在韭菜上的使用安全性,以8种农药的推荐使用剂量和农户实际使用剂量施用,采收不同间隔期的样品进行农药残留量分析。试验结果表明,毒死蜱在药后30 d检出值分别为0.1000和0.2000 mg·kg^(-1),仍超过最高限量0.02 mg·kg^(-1)。腐霉利常规处理A在药后7 d降解至4.450 mg·kg^(-1),符合限量要求;处理B直至药后21 d才降解至3.5400 mg·kg^(-1),符合限量要求。其余6种药剂的常规处理A在药后7 d内均降解至最高限量内,其中高效氯氟氰菊酯、异菌脲和啶虫脒在药后2 h残留量即符合限量要求,可放心施用;氯氰菊酯和阿维菌素在药后3 d、辛硫磷在药后7 d残留量符合限量要求。常规施药量的1.2倍处理B中氯氰菊酯推迟至药后10 d,其残留量才符合限量要求。

In order to evaluate the safety of eight pesticides,including procymidone,chlorpyrifos,eta-cyfluthrin,cypermethrin,iprodione,acetamiprid,phoxim and avermectin,on Allium tuberosum Rottler ex Sprengle,the recommended dosage of the eight pesticides and the actual dosage used by farmers were applied.Samples from different intervals were collected for pesticide residue analysis.The experimental results showed that the detection values of chlorpyrifos were 0.1000 and 0.2000 mg·kg^(-1),respectively,until 30 days after treatment,still exceeding the maximum limit of 0.02 mg·kg^(-1).The conventional treatment A of procymidone degraded to 4.450 mg·kg^(-1)until 7 days after treatment,meeting the limit requirements;Treatment B did not degrade to 3.5400 mg·kg^(-1)until 21 days after treatment,meeting the limit requirements.The conventional treatment A of the other six pesticides all degraded to the maximum limit within 7 days after treatment,among which the residual levels of eta-cyfluthrin,iprodione,and acetamiprid meet the limit requirements after 2 hours of treatment,and can be used with confidence;The residual levels of cypermethrin and avermectin after 3 days of treatment and phoxim after 7 days of treatment meet the limit requirements.The residual amount of cypermethrin in treatment B,which is 1.2 times of the conventional dosage,is delayed until 10 days after treatment to meet the limit requirements.