Abstract
Concomitant determination of the pesticides metribuzin, atrazine, metolachlor and esfenvalerate in agricultural runoff water was developed utilizing solid-phase extraction (SPE). A 2 5 factorial experimental design compared relative importance for extraction efficiency of the five variables sample pH, elution solvent strength, ionic strength of the sample, addition of organic modifier to the sample, and elution by gravity or vacuum. The protocol was further optimized with respect to sorbent mass, sample volume, elution volume and concentration. The approach offers optimal recoveries, low detection limits, rapid extraction, and final determination by either gas or high-performance liquid chromatography.
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