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  • Title: Determination of coumaphos and its oxygen analog in eggs by in situ fluorometry.
    Author: Zakrevsky JG, Mallet VN.
    Journal: J Assoc Off Anal Chem; 1975 May; 58(3):554-6. PubMed ID: 1141186.
    Abstract:
    A method is reported for the simultaneous determination of coumaphos (o,o-diethyl o(3-chloro-4-methyl-2-oxo-2H-1-benzopyran-7-yl)phosphorothioate) and its oxygen analog, Coroxon, in eggs in the ppb range. The residues are extracted with acetone and chloroform. The extract is purified by liquid-liquid partition followed by column chromatography and then by 2-dimensional thin layer chromatography. The fluorescence is measured directly on the chromatogram.
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