Sand as a solid support in ultrasound-assisted MSPD: A simple, green and low-cost method for multiresidue pesticide determination in fruits and vegetables.

Sand as a solid support in ultrasound-assisted MSPD: A simple, green and low-cost method for multiresidue pesticide determination in fruits and vegetables.

Dos Santos, Elisane O;Gonzales, Julia O;Ores, Joana C;Marube, Liziane C;Caldas, Sergiane S;Furlong, Eliana B;Primel, Ednei G;
Food chemistry 2019 Vol. 297 pp. 124926
329
dos-santos2019sandfood

Abstract

Sand was studied as a solid support in ultrasound-assisted matrix solid-phase dispersion (UA-MSPD) for the extraction of different pesticide classes, including organophosphates, carbamates, triazoles and pyrethroids from fruits and vegetables, with determination by GC-MS and LC-MS/MS. The performance of sand was compared with that of different types of classic solid supports and alternative natural materials from renewable sources. The best results were obtained using 0.5 g sample, 1 g sand as a solid support, 20 mg activated charcoal and 5 mL ethyl acetate as elution solvent. Recoveries ranged from 55 to 140% with an RSD ≤ 20%. LOQs varied from 0.005 to 0.5 mg kg for all analytes. Thiamethoxam, captan, chlorpyrifos, dimethoate and pyrimethanil were found in strawberry samples at concentrations from 0.01 to 0.06 mg kg. Acephate and tebuconazole were found in a tomato sample at concentrations of 0.45 and 0.30 mg kg, respectively. The method developed was efficient, simple, cheap, robust, and environmentally friendly.

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