Document Type : Research Paper
Department of Analytical Chemistry, Faculty of Chemistry, University of Tabriz, Tabriz, Iran
University of Tabriz
Department of Applied Chemistry, Faculty of Chemistry, University of Tabriz, Tabriz, Iran
Department of Inorganic Chemistry, Faculty of Chemistry, University of Tabriz, Tabriz, Iran
Food and Drug Safety Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
The proposed analytical method tries to illustrate a new approach for the extraction of some pesticides from different fruit beverages (orange, pineapple, cherry, and mango) using UiO-66 as a capable adsorbent. Further preconcentration for heightening enrichment factors of the analytes was accomplished using a dispersive liquid-liquid microextraction. The synthesized adsorbent was carefully characterized using nitrogen adsorption/desorption, X-ray diffraction, MAP, Fourier transform infrared spectrophotometry, energy dispersive X-ray, and scanning electron microscopy analyses. The performed analyses proved the successful formation of the desired compound. After the sorption of the target compounds onto UiO-66 particles by vortexing, the adsorbent was separated by centrifugation. The analyte-loaded adsorbent was treated with 1.0 mL of acetonitrile for the aim of desorption. The obtained eluate containing the desorbed pesticides was mixed with 38 µL of 1,1,1-trichloroethane and hastily injected into sodium chloride solution. After the centrifugation, an aliquot of the sedimented phase was injected into a gas chromatograph equipped with a flame ionization detector. Satisfactory figures of merit obtained in this survey consisted of high enrichment factors (215-275), acceptable extraction recoveries (43-55%), low limits of detection (1.10-2.35 µg L-1) and quantification (3.66-7.82 µg L-1), low relative standard deviations (≤ 7.8%), and wide linear ranges. Also, the proposed method benefits from the high surface area of the adsorbent and low matrix effect.