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  • Title: Rapid gas chromatographic method for the multiresidue screening of fruits and vegetables for organochlorine and organophosphate pesticides.
    Author: Pylypiw HM.
    Journal: J AOAC Int; 1993; 76(6):1369-73. PubMed ID: 8286976.
    Abstract:
    A rapid and reliable method was developed for the determination of pesticides in fruits and vegetables. A 100 g sample is extracted with a mixture of 200 mL petroleum ether and 100 mL 2-propanol. The extract is backwashed 4 times, twice with aqueous sodium sulfate and twice with 350 mL distilled water, and then dried over 15 g sodium sulfate. The dried extract is analyzed by capillary gas chromatography with selective organochlorine and organophosphorus detection. The method determines primarily nonpolar pesticides, with recoveries ranging from 81 to 114%, and has an average limit of detection of 10 ppb for both detectors.
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