Development of an on-line temperature-assisted ionic liquid dispersive microextraction system for sensitive determination of vanadium in environmental and biological samples

详细信息    查看全文

• 作者：Paula Berton ; Estefaní ; a M. Martinis ; Rodolfo G. Wuilloud
• 关键词：1-Butyl-3-methylimidazolium hexafluorophosphate ; Room temperature ionic liquid ; Microextraction ; Vanadium ; On-line preconcentration
• 刊名：Journal of Hazardous Materials
• 出版年：2010
• 出版时间：15 April 2010
• 年：2010
• 卷：176
• 期：1-3
• 页码：721-728
• 全文大小：455 K

文摘

An original flow injection (FI) system was developed for on-line microextraction of Vanadium (V) based on room temperature ionic liquid (RTIL). Vanadium was complexed with 2-(5-bromo-2-pyridylazo)-5-diethylaminophenol (5-Br-PADAP) at pH 4.0. A 40 μL-volume of 1-butyl-3-methylimidazolium hexafluorophosphate ([C₄mim][PF₆]) RTIL was mixed with 5 mL of sample solution containing the V-5-Br-PADAP complex. Then, a fully on-line temperature-assisted dispersion procedure was developed, followed by, analyte microextraction; and final on-line separation of the RTIL phase with a florisil-containing microcolumn. Vanadium was removed from the microcolumn with a 10 % (v/v) nitric acid (in acetone) solution, and finally measured by electrothermal atomic absorption spectrometry (ETAAS). The detection limit achieved after preconcentration of 5 mL of sample solution, was 4.8 ng L⁻¹. The relative standard deviation (RSD) for 10 replicate determinations at 5 μg L⁻¹ of vanadium level was 4.1 % , calculated from the obtained peak heights. The calibration graph was linear, with a correlation coefficient of 0.9982 at levels from the detection limits up to 15 μg L⁻¹. The method was successfully applied for the determination of vanadium in environmental and biological samples.