چاپ صفحه |  صفحه نخست سامانه |  چکیده مقاله |  نویسندگان |  دانلود مقاله | دانشگاه علوم پزشکی تبریز |
| In this work, an effervescent tablet containing ionic liquids was madeand used in ultrasonic-assisted dispersive liquid–liquid microextractionfor extraction and preconcentration of benzoylurea insecticides (hexa-flumuron, teflubenzuron, triflumuron and chlorfluazuron) in fruit juiceand vegetable sample prior to high-performance liquid chromatogra-phy-diode array detection. In this method, the effervescent tabletcomposed of sodium bicarbonate, tartaric acid and potassium bromideis used for dispersion of an extraction solvent into an aqueous phasecontaining the analytes. An ionic liquid (1-butyl-3-methylimidazoliumhexafluorophosphate) is used as the extraction solvent. An acid–basereaction between tartaric acid and sodium bicarbonate is immediatelyoccurred, after releasing the tablet into the aqueous phase, and theproduced CO2leads to dispersion of the extraction solvent (placed inthe tablet) into the solution as tiny droplets. Also, sonication is used inthe improvement of dispersion of the extraction solvent and masstransfer of the analytes into the tiny droplets of the extraction solvent.Under the optimum conditions, limits of detection and quantificationwere obtained in the ranges of 0.04–0.19 and 0.13–0.64 ng mL–1,respectively. The enrichment factors and extraction recoveries of theselected analytes ranged from 370 to 465 and 74% to 93%, respectively.The relative standard deviations were≤6.9% for intra-day (n = 6) andinter-day (n = 5) precisions at a concentration of 1 ng mL–1of eachanalyte. Finally, some fruit juice and vegetable samples were effectivelyanalysed by the proposed method, and hexaflumuron was found incabbage sample, at ng g−1concentration range |
| نویسنده | نفر چندم مقاله |
|---|---|
| محمدرضا افشار مقدم | دوم |
| نام فایل | تاریخ درج فایل | اندازه فایل | دانلود |
|---|---|---|---|
| bamorowat-int.pdf | 1399/07/14 | 1870358 | دانلود |
