18.7%烯酰·吡唑酯水分散粒剂在黄瓜和土壤中的残留消解动态

Degradation Dynamics of Dimethomorph+Pyraclostrobin 18.7% WG in Cucumber and Soil

为评价吡唑醚菌酯和烯酰吗啉在黄瓜上使用的安全性，对18．7％烯酰·吡唑酯水分散粒剂在黄瓜和土壤中的残留消解动态进行了研究。消解动态符合一级动力学方程，吡唑醚菌酯在黄瓜和土壤中的降解半衰期分别为1．4～4．2d、8．5～11．8d，烯酰吗啉在黄瓜和土壤中的降解半衰期分别为1．5～4．7d、17．7～33．6d。黄瓜和土壤中吡唑醚菌酯最终残留量分别为0．006～0．333mg／kg、0．066～2．237mg／kg。烯酰吗啉最终残留量分别为0．006～0．632mg／kg、0．108～4．866mg／kg。吡唑醚菌酯和烯酰吗啉的最终残留量均低于国家标准中规定的最大残留限量。

Degradation dynamics of dimethomorph ＋ pyraclostrobin 18.7% WG in cucumber and soil were studied to evaluate its safety. The degradation dynamics of pyraclostrobin and dimethomorph in cucumber and soil followed the first order reaction. The half-lives of pyraclostrobin in cucumber and soil were 1.4-4.2 d and 8.5-11.8 d, the half-lives of dimethomorph in cucumber and soil were 1.5-4.7 d and 17.7-33.6 d. The final residues of pyraclostrobin in cucumber and soil were 0.006-0.333 mg/kg and 0.066-2.237 mg/kg, the final residues of dimethomorph in cucumber and soil were0.006-0.632 mg/kg and 0.108-4.866 mg/kg. The final residues of pyraclostrobin and dimethomorph in cucumber were all less than the maximum residue limits in cucumber.