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[目的]研究甲氨基阿维菌素苯甲酸盐在茭白上的消解动态和残留变化趋势,评价使用安全性。[方法]样品用乙腈提取,LC-MS/MS仪检测,外标法定量。[结果]方法的准确度和精密度符合农药残留分析要求;其在茭白植株中的消解动态规律符合一级动力学方程,半衰期为0.59~3.34 d;按有效成分剂量23~34.5 mg a.i./L,施药2~3次,距末次施药后14、21、28 d采样,茭白中均检测不到其残留(<0.01×1~(-3)mg/kg)。[结论]甲氨基阿维菌素苯甲酸盐按推荐方法剂量在茭白上使用是安全的。
[Objective] The research aimed to study the digestion dynamic and residual change trend of emamectin benzoate on Rhizoma Paridis and evaluate the safety of its use. [Method] Samples were extracted with acetonitrile, detected by LC-MS / MS and quantified by external standard method. [Result] The accuracy and precision of the method were in accordance with the requirements of pesticide residue analysis. The digestion dynamic of the plant was in accordance with the first-order kinetic equation with a half-life of 0.59-3.34 d. The active ingredient dosage was 23-34.5 mg ai / L . The pesticides were applied 2 to 3 times, and the residuals (<0.01 × 1 ~ (-3) mg / kg) were not detected at 14, 21 and 28 d after the last application. [Conclusion] Emamectin benzoate is safe to use on the purpurins according to the recommended method.