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建立GC-NPD测定苯醚甲环唑和嘧菌酯在香蕉和土壤中残留的分析方法。样品经乙腈提取,弗罗里硅土小柱净化,洗脱液为正己烷∶丙酮=9∶1。结果表明:该方法可以同时检测出香蕉和土壤中两种物质的含量,两种物质在0.05～2μg/mL的范围内有良好的线性关系,苯醚甲环唑和嘧菌酯的线性相关系数分别为0.997 3和0.999 4。在香蕉果、肉和土中的最低检测浓度皆为0.05 mg/kg,最小检出量为0.05 ng,在不同样品中的平均回收率分别为85.4%～107.4%和93.4%～106.3%,相对标准偏差分别为1.67%～7.80%和1.40%～5.84%。
GC-NPD was established for the determination of difenoconazole and azoxystrobin residues in bananas and soil analysis. Samples were extracted with acetonitrile, Florisil silica column purification, eluent hexane: acetone = 9: 1. The results showed that the method could detect the content of two substances in banana and soil at the same time. There was a good linear relationship between the two substances in the range of 0.05 ~ 2μg / mL. The linear correlation coefficient of difenoconazole and azoxystrobin Respectively 0.997 3 and 0.999 4. The minimum detectable concentrations in banana fruit, meat and soil were 0.05 mg / kg and the minimum detectable amount was 0.05 ng. The average recoveries in different samples were 85.4% -107.4% and 93.4% -106.3% respectively, The standard deviations were 1.67% ~ 7.80% and 1.40% ~ 5.84% respectively.