Abstract
A method was developed using matrix solid-phase dispersion and liquid chromatography with ultraviolet diode array detection for the determination of bromopropylate, clofentezine, coumaphos, difenoxuron, diniconazole, fenvalerate, flumetralin, fluometuron, and teflubenzuron in the stem of coconut palm. The parameters evaluated included the type of sorbent (C18-bonded silica, neutral alumina, silica gel, and Florisil) and the volume of the eluting solvent, acetonitrile. The best results were obtained using 0.25 g of stem, 1.0 g of neutral alumina as sorbent, and 5 mL of acetonitrile. The method was validated using stem samples spiked with pesticides at different concentration levels (0.01–10.0 µg mL−1). Average recoveries (using three replicates) ranged from 70 to 91 %, with relative standard deviations between 1.6 and 10 %. Detection and quantification limits were in the ranges 0.01–0.05 and 0.05–0.2 µg g−1, respectively.
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