Conversion of a conventional packed-column gas chromatograph to accommodate megabore columns. II. Determination of organophosphorus insecticides in environmental water
Mallet, C.; Mallet, V.N.
Journal of Chromatography 481: 37-44
1989
ISSN/ISBN: 0021-9673 PMID: 2592498 Document Number: 337714
Several methods involving solvent extraction or solid extraction (Amberlite XAD resins) were studied for the multi-residue recovery of fourteen organophosphorus compounds in water. It was found that extraction with ethyl acetate in a salted medium provided the most consistent data, both in terms of number of compounds recovered and percentage recovery. Amberlite XAD resins gave consistently high recoveries, and this was attributed to a matrix effect upon the particular nitrogen-phosphorus detector. The evaluation was made using a megabore column installed in a conventional packed-column chromatograph, and the results show that such a system is amenable to the multi-residue analysis of organophosphorus pesticides at very low costs.