چاپ صفحه |  صفحه نخست سامانه |  چکیده مقاله |  نویسندگان |  دانلود مقاله | دانشگاه علوم پزشکی تبریز |
| A dispersive solid phase extraction method was combined with deep eutectic solvent–based solid- ification of floating organic drop–dispersive liquid–liquid microextraction and used for the extrac- tion/preconcentration of some organophosphorus pesticides residues from edible oil samples. The ex- tracted analytes were quantified with gas chromatography–nitrogen phosphorous detector. In this pro- cedure, the sample lipids are saponified with a sodium hydroxide solution and then the analytes are adsorbed onto a primary secondary amine sorbent. After that the analytes are desorbed with acetone as an elution/dispersive solvent and mixed with choline chloride: 3,3–dimethyl butyric acid deep eutectic solvent and the mixture is rapidly dispersed into deionized water. Then, the obtained cloudy solution is centrifuged and placed into an ice bath. The extraction solvent is solidified on the top of the solution. Finally, it is removed and dissolved in acetonitrile, and 1 μL of the solution is injected into the sepa- ration system. Validation of the method showed that limits of detection and quantification were in the ranges of 0.06–0.24 and 0.20–0.56 ng mL –1 , respectively. Enrichment factors and extraction recoveries of the analytes ranged from 170–192 and 68–77%, respectively. The method had an acceptable precision with relative standard deviations less than ≤9.2% for intra–(n = 6) and inter–day (n = 6) precisions at four concentrations (3, 10, 50, and 250 ng mL –1 , each analyte). Finally the method was used for determination of the analytes in five edible oil samples. |
| نویسنده | نفر چندم مقاله |
|---|---|
| محمدرضا افشار مقدم | چهارم |
| نام فایل | تاریخ درج فایل | اندازه فایل | دانلود |
|---|---|---|---|
| JCA-Oil.pdf | 1399/04/26 | 1571461 | دانلود |
