期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 176, 期 1-3, 页码 721-728出版社
ELSEVIER
DOI: 10.1016/j.jhazmat.2009.11.094
关键词
1-Butyl-3-methylimidazolium hexafluorophosphate; Room temperature ionic liquid; Microextraction; Vanadium; On-line preconcentration
资金
- Consejo Nacional cle Investigaciones Cientificas y Tecnicas (CONICET)
- Agencia Nacional cle Promocion Cientifica y Tecnologica (FONCYT) (PICT-BID)
- Universidad Nacional de Cuyo (Argentina)
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 mu L-volume of 1-butyl-3-methylimidazolium hexafluorophosphate ([C(4)mim][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 mu g 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 mu g L-1. The method was successfully applied for the determination of vanadium in environmental and biological samples. (C) 2009 Elsevier B.V. All rights reserved.
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