Organophosphate compounds extraction solvents

The difficulties and problems of LLE of pesticides from water have been outlined. A theoretical approach for accurate and precise quantitation of pesticides from natural water using p-values has been proposed. Few p-values have been reported for aqueous solvent systems some have been determined for organophosphate pesticides (35). Table VI shows the p-value for the parathion system consisting of parathion, its oxon, and hydrolysis product, p-nitrophenol extracted under the conditions of 0.2M phosphate buffer and a pH of 3.10. At this pH value these compounds hydrolyze least. Ether is the best solvent for the LLE of the whole system. Equations 10, 11, 12, and 13 are now used to determine... 

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