Thin-Layer Chromatographic Studies of the Mobility of Pesticides through Soil-Containing Static Flat-Beds

摘要

The chromatographic behavior of some pesticides has been studied on silica, soil, and mixed layers containing soil, with aqueous ammonium or sodium salt solutions, with or without added N-cetyl-N,N,N,-trimethylammonium bromide (CTAB),with pure organic solvents, and with aqueous CTAB systems. One interesting aspect of this study is the migration of persticides such as phosphamidon and dimethoate through pure soil. Several important binary separations have been achieved, sulfur-containing pesticides have been successfully separated from those with chlorine, phosphorus, or both phosphorus and sulfur in their molecules. Phosphorus-containing pesticides were found to migrate faster than those not containing phosphorus, in a variety of mobile phases, irrespective of the nature of the stationary phase. The trend in the relative mobilities of pesticides on the different stationary phases used is also reported.