香蕉和土壤中吡唑醚菌酯的残留分析

建立吡唑醚菌酯在香蕉全蕉、蕉肉及土壤中的残留分析方法，测定吡唑醚菌酯在云南、海南两地香蕉及土壤中的残留动态及最终残留。结果表明：在0.01~0.1 mg/kg添加范围内，吡唑醚菌酯在香蕉果、肉、土中的平均回收率为82％~104％，变异系数为1.3％~3.6％；方法最小检出量为1×10-10 g，最低检出浓度为0.01 mg/kg。吡唑醚菌酯在云南和海南两地香蕉中的半衰期分别为17.2、16.7 d，在土壤中的半衰期分别为19.9、17.9 d。施药后35、42、49 d收获的香蕉中吡唑醚菌酯残留量均低于0.02 mg/kg。该方法准确度高，灵敏度高，线性良好。

Residue Analysis of Pyraclostrobine in Banana and Soil

The method for the determination of pyraclostrobine residues in banana fruit, flesh and soil was established. Residue analysis of pyraclostrobine in banana and soil were determined. The field experiments were investigated in Yunnan and Hainan. Average recoveries of pyraclostrobine in banana fruit, flesh and soil were found in the range of 82%~104% at the three spiking levels from 0.01 to 0.1 mg/kg with relative standard deviations of 1.3%~3.6%. The lowest detection limit of instrument for pyraclostrobine was 1×10-10 g, and the limit of quantitation was 0.01 mg/kg. The experiments results demonstrated that the half-lives for banana was 17.2 d in Yunnan, and 16.7 d in Hainan, respectively. And the half-lives for soil was 19.9 d in Yunnan, and 17.9 d in Hainan, respectively. The residue of pyraclostrobine was <0.02 mg/kg in banana, after 35, 42 and 49 d of spray. The method showed high accuracy, high sensitivity and good linearity. The experiments provide scientific basis for evaluating the safety and rationality of using pyraclostrobine in banana.