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《Physical Testing and Chemical Analysis Part B Chemical Analysis》 2005-12
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RAPID DETERMINATION OF RESIDUAL ORGANOPHOSPHORUS PESTICIDES IN WELSH ONION BY SOLID-PHASE EXTRACTION-GAS CHROMATOGRAPHY

WANG Lian-zhu~1,YOU Jun~1,CHEN Zhi-hua~1,LIANG Ming~2,LU Shen-yu~2,HONG Wei-ping~1(1.Zhangzhou Entry-Exit Inspection and Quarantine Bureau,Zhangzhou 363000,China;2.Fujian Entry-Exit Inspection and Quarantine Bureau,Fuzhou 350001,China)  
Gas chromatography hyphenated with solid-phase extraction was applied to the rapid determination of 8 residual organophosphorus pesticides(Opp′s) in welsh onion.The onion sample(25 g) was extracted with a mixture containing 50 mL of acetonitrile and 10 mL of sat′d NaCl water solution.The extract was filtered and salted out with 6 g of NaCl by shaking vigorously for 3 min in a separatory funnel.10.0 mL of the organic phase was evaporated(at 40 ℃) to dryness,and the residue was taken up with 1.0 mL of nhexane,and purified by SPE on silica gel column(Accu Bond Ⅱ silica cartridges).The Opp′s on the column was eluted with acetone-n-hexane((1+1)) mixture and 15 mL of the eluate was taken and dried by blowing with nitrogen.n-Hexane(1.0 mL) was used to dissolved the residue and the solution was used for GC determination.Two capillary columns(HP 5 and DB1701) with different polarity were used in the GC identification and determination,and two flame photometric detectors were used.Recoveries for the 8 Opp′s were tested by the standard addition method and the results obtained were in the range of 60%-130%.RSD′s found were less than 18%.Detection limits were in the range of 0.02-0.05 mg·kg~(-1).
【CateGory Index】: TS207.53;O657.71
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