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首页> 外文期刊>Journal of the Iranian Chemical Society >Synthesis of MOF-70 based on diffusion method; microgram amount application as a highly efficient sorbent in dispersive micro solid phase extraction prior to dispersive liquid-liquid microextraction for the preconcentration and extraction of pesticides from fruit juices
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Synthesis of MOF-70 based on diffusion method; microgram amount application as a highly efficient sorbent in dispersive micro solid phase extraction prior to dispersive liquid-liquid microextraction for the preconcentration and extraction of pesticides from fruit juices

机译：Synthesis of MOF-70 based on diffusion method; microgram amount application as a highly efficient sorbent in dispersive micro solid phase extraction prior to dispersive liquid-liquid microextraction for the preconcentration and extraction of pesticides from fruit juices

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摘要

In the present research, a sample preparation method called dispersive microsolid phase extraction followed by dispersive liquid-liquid microextraction was developed based on MOF-70 as a highly efficient adsorbent for the extraction of seven pesticides including chlorpyrifos, haloxyfop-R-methyl, oxadiazon, diniconazole, clodinafop-propargyl, fenpropathrin, and fenoxaprop-P-ethyl from various fruit beverages (orange, pineapple, pomegranate, grape, and cherry beverages). In the first step, the pesticides are loaded on the MOF particles from the sample solution by vortexing and then settled down by centrifugation. Then, they are desorbed by acetonitrile from the MOF surface. In the next step, the obtained acetonitrile phase is mixed with mu L-level of 1,1,1-trichloroethane and injected into deionized water. After the final centrifugation, the sedimented phase is collected and an aliquot of the obtained phase is injected into a gas chromatograph equipped with a flame ionization detector. MOF-70 is carefully synthesized and characterized using X-ray diffraction, Fourier transform infrared spectrophotometry, scanning electron microscopy, energy-dispersive X-ray, and nitrogen adsorption/desorption analysis. After optimization of the process, satisfactory figures of merit were obtained such as high extraction recoveries (35-96%) and enrichment factors (175-480), low relative standard deviations (4.5-8.5%), wide linear ranges, and low limits of detection (0.20-0.76 mu g L-1) and quantification (0.65-2.47 mu g L-1). The developed approach can be introduced as a highly efficient analytical method based on MOF-70 for the analysis of various pesticides in juice samples.

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