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建立了气相色谱仪测定梨果和土壤中己唑醇的残留分析方法,并开展了市售梨果样品中己唑醇残留量的检测。梨果和土壤样品以乙腈为提取溶剂提取,用中性氧化铝和弗罗里硅土的混合柱净化,经浓缩后正己烷定容,GC-ECD测定己唑醇残留量。在添加浓度范围内(0.01~0.5 mg·kg~(-1)),梨果中己唑醇的平均添加回收率为77.4%~99.1%,相对标准偏差为7.5%~9.8%;土壤中己唑醇的平均添加回收率为82.2%~95.3%,相对标准偏差为5.8%~9.9%。该方法的准确性、精确性均达到农药残留分析的要求。采用该方法对市售梨果实际样品的检测结果表明,梨果中己唑醇的残留量均未超过最高残留限量值。
A gas chromatograph was established for the determination of hexaconazole in soil and the residue of hexaconazole, and the detection of hexaconazole in commercially available pear fruit was carried out. Pear and soil samples were extracted with acetonitrile as extraction solvent and purified by a mixed column of neutral alumina and Florisil. After concentration, the volume of n-hexane was determined. The content of hexaconazole was determined by GC-ECD. The average recoveries of hexaconazole in pear fruit ranged from 77.4% to 99.1% and the relative standard deviations (RSDs) ranged from 7.5% to 9.8% at the concentration range of 0.01-0.5 mg · kg -1. The average recoveries of azole alcohol were 82.2% ~ 95.3% with relative standard deviations of 5.8% ~ 9.9%. The accuracy and accuracy of the method meet the requirements of pesticide residue analysis. Using this method, the test results of commercially available pear fruits showed that the residues of hexaconazole in pear fruit did not exceed the maximum residue limit value.