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

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 hexafluoroph...

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Veröffentlicht in:Journal of hazardous materials 2010-04, Vol.176 (1), p.721-728
Hauptverfasser: Berton, Paula, Martinis, Estefanía M., Wuilloud, Rodolfo G.
Format: Artikel
Sprache:eng
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Zusammenfassung: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 ([C 4mim][PF 6]) 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.
ISSN:0304-3894
1873-3336
DOI:10.1016/j.jhazmat.2009.11.094