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Supercritical Fluid Extraction Gas Chromatographic Determination of Organophosphorus Pesticides in Vegetables and Fruits

WANG Jian hua * (Shandong Impostand Export Commodity Inspection Bureau,Qingdao 266002), WANG Guo tao and YUAN She mei (Shengli Oil Transportation Company,Weifang),Fenxi Shiyanshi,1999,18(6):55~58  
A simple supercritical fluid extraction(SFE) method has been developed to efficiently extract multiresidues of organophosphorus from fresh vegetables and fruits by using commercial SFE equipment and moderate SFE conditions. Samples were mixed with hydromatrix and extracted with supercritical carbon dioxide at 30MPa, 50℃ and 25 mL with 10mL of ethyl acetate as trapping system. Recoveries of most pesticides from subsamples of 2g with this procedure were 82%~107%, with relative standard deviations of 4 6%~11%. Oranges,tomatoes,strawberrys and lemon samples were analyzed with this method, and the results were comparable with those by traditional analyses.The results indicated that the method can be used as multiresidue screening for the determination of organophosphorus insecticides in vegetables and fruits.
【CateGory Index】: O657.32
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