Abstract
Our previously reported procedure for analyzing pesticides in aqueous samples involving liquid-solid extraction by graphitzed carbon black (GCB) followed by liquid chromatography was appropriately modified for extending the analysis to very polar pesticides and pesticide metabolites. For this purpose, a 1-g GCB reversible extraction cartridge was adopted. Pesticide reextraction was performed by back-flushing the cartridge with a suitable eluant phase. The advantages of back-flush over forward flush desorption are illustrated
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