Journal
FOOD CHEMISTRY
Volume 297, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2019.05.200
Keywords
Multiresidue pesticide analysis; Sea sand; Ultrasound-assisted matrix solid-phase dispersion; Gas chromatography-mass spectrometry; Liquid chromatography-tandem mass spectrometry
Funding
- Brazilian agency FAPERGS [22412551/14-5]
- Brazilian agency FINEP
- CAPES
- Brazilian Agency CNPq [DT 311694/2016-0]
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior - Brasil (CAPES) [001]
- PNPD/CAPES [1461080]
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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(-1) for all analytes. Thiamethoxam, captan, chlorpyrifos, dimethoate and pyrimethanil were found in strawberry samples at concentrations from 0.01 to 0.06 mg kg(-1). Acephate and tebuconazole were found in a tomato sample at concentrations of 0.45 and 0.30 mg kg(-1), respectively. The method developed was efficient, simple, cheap, robust, and environmentally friendly.
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