Use of solid-phase extraction disks for analysis of moderately polar and nonpolar pesticides in high-moisture foods.

This study investigated the use of solid-phase extraction (SPE) disks in analysis of high-moisture (< 2% fat) foods for organophosphorus and organochlorinated pesticides with low (< 25 mg/mL) water solubilities. Five representative foods were each spiked with one of 18 pesticides at 2 levels. Gas chromatography with flame photometric and electrolytic conductivity detection was used to quantitate organophosphates and organochlorinated pesticides, respectively. Essentially complete recoveries (> or = 80%) suggest that use of SPE disks can complement traditional liquid-liquid extraction procedures.