شماره ركورد كنفرانس :
3550
عنوان مقاله :
Development of simple and efficient microextraction method for extraction of some pesticides in fruit juice samples prior to their determination by GC–FID
پديدآورندگان :
Sadeghi Alavian Ali Department of Analytical Chemistry, Faculty of Chemistry, University of Tabriz, Tabriz, Iran , Farajzadeh Mir Ali mafarajzadeh@tabrizu.ac.ir Department of Analytical Chemistry, Faculty of Chemistry, University of Tabriz, Tabriz, Iran; mafarajzadeh@yahoo.com; , Sattari Dabbagh Masoumeh Department of Analytical Chemistry, Faculty of Chemistry, University of Tabriz, Tabriz, Iran
كليدواژه :
Vortex–assisted liquid–liquid microextraction based on solidification of floating organic droplet , Pesticide , Gas chromatography , Fruit juices
عنوان كنفرانس :
بيست و پنجمين سمينار ملي شيمي تجزيه انجمن شيمي ايران
چكيده فارسي :
Pesticides are defined as any substance or mixture of substances that destroy or reduce the severity of pests. Over the past decades, different kinds of pesticides have been widely used to increase agricultural productivity [1]. However analysis of pesticide residues in food samples is necessary due to their toxicity for human. Different analytical methods have been used for this purpose. In most cases performing a sample preparation step is needed before performing the analytical methods. Liquid–liquid extraction (LLE) [2] and solid phase extraction (SPE) [3] are two commonly used methods for sample preparation of pesticides in different samples. In the present study, a simple, green, and rapid sample preparation method namely vortex–assisted liquid–liquid microextraction based on solidification of floating organic droplet has been developed for the extraction and preconcentration of diazinon, ametryn, chlorpyrifos, penconazole, oxadiazon, diniconazole, and fenazaquin in fruit juice samples prior to their analysis with gas chromatography–flame ionization detection. In this method, menthol as a green extraction solvent is added into sample solution and then vortexed. The obtained cloudy solution is centrifuged and the dispersed fine droplets of the extraction solvent are collected on the top of the aqueous phase as a single drop. Some important parameters such as ionic strength, vortexing time, pH, etc were investigated and optimized. Under the optimum experimental conditions, limits of detection and quantification were obtained in the ranges of 0.50–1.3 and 1.7–4.3 µg L–1, respectively. The obtained values for enrichment factors and extraction recoveries were in the ranges of 263–421 and 53–84%, respectively. Repeatability of the method expressed as relative standard deviation was ≤ 7% for intra– (n=6) and inter–day precisions at a concentration of 50 µg L–1 of each pesticide.
