水果和蔬菜中硫双威的提取净化及测定方法研究

CLEANUP AND DETERMINATION METHOD FOR THE MULTIRESIDUE ANALYSIS OF THIODICARB IN VEGETABLES AND FRUITS BY GC-FPD

本文提出了一种提取净化蔬菜、水果中残留硫双威的前处理方法和用火焰光度检测的气相色谱法。该法的最低检出浓度为００４ｍｇ／ｋｇ，在蔬菜、水果中的平均加标回收率分别为９２９８％～１０６７％和９４５２％～１０４２％，变异系数分别在２５７％～６０５％和２７４％～５８３％之间。该方法快速、准确。

A quick and effective liquid-liquid extraction and cleanup method has been developed for the gas chromatographic determination of thiodicarb in vegetables and fruits.The samples were extracted by methylene chloride.Rotary-evaporated was all methylene chloride.Quantitatively transferred extracts were with an aqueous solution containing 28% alcohol.The aqueous layer was extracted by petroleum ether.Discarded was all petroleum ether layer.It was exrtacted and diluted with CHCl 3.The residues were detected by GC-FPD.The minimum detective concentration of thiodicard in vegetables and fruits was 0.04 mg/kg.The average recoveries of thiodicarb in vegetables and fruits were in the range of 92.98%～106.7% and 94.52%～104.2% respectively.The coefficients of variation were in the range of 2.57%～6.05% and 2.74%～5.83% respectively.