Jump to main content
Jump to site search
PLANNED MAINTENANCE Close the message box

Scheduled maintenance work on Wednesday 22nd May 2019 from 11:00 AM to 1:00 PM (GMT).

During this time our website performance may be temporarily affected. We apologise for any inconvenience this might cause and thank you for your patience.


Issue 5, 2012
Previous Article Next Article

Determination of very low amounts of chromium(III) and (VI) using dispersive liquid–liquid microextraction by in situ formation of an ionic liquid followed by electrothermal atomic absorption spectrometry

Author affiliations

Abstract

A new procedure for the determination of very low levels of Cr(III) and Cr(VI) using ionic liquid dispersive liquid–liquid microextraction (IL-DLLME) followed by electrothermal atomic absorption spectrometry (ETAAS) is presented. The ionic liquid, 1-octyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide ([C8MIm][NTf2]), is formed in situ by mixing 1-octyl-3-methylimidazolium chloride ([C8MIm]Cl) and lithium bis(trifluoromethanesulfonyl)imide ([NTf2]Li) aqueous solutions, and is used to extract complexes originating from Cr(III) and Cr(VI) with ammonium pyrrolidinedithiocarbamate (APDC). No organic solvents are required, the dispersion being due to the very fine droplets of ([C8MIm][NTf2]) originated in the aqueous solution. After centrifugation, the concentration of chromium in the sedimented phase is determined by ETAAS. The total content of chromium is measured using 0.01 mol L−1 APDC at pH = 1. In the presence of 0.001 mol L−1 ethylenediaminetetraacetate, Cr(III) is not extracted, and the analytical signal corresponds to Cr(VI). The level of Cr(III) is obtained by difference. The enrichment factor of the procedure is 300 and a detection limit of 2 ng L−1 is achieved. The relative standard deviation for 10 replicates at the 0.05 μg L−1 level is close to 8%. The recoveries of spiked samples are in the 95–104% range. The method is applied to the analysis of water samples as well as lixiviates obtained from toys made of plastic materials.

Graphical abstract: Determination of very low amounts of chromium(iii) and (vi) using dispersive liquid–liquid microextraction by in situ formation of an ionic liquid followed by electrothermal atomic absorption spectrometry

Back to tab navigation

Publication details

The article was received on 19 Dec 2011, accepted on 27 Feb 2012 and first published on 28 Feb 2012


Article type: Paper
DOI: 10.1039/C2JA10378H
J. Anal. At. Spectrom., 2012,27, 874-880

  •   Request permissions

    Determination of very low amounts of chromium(III) and (VI) using dispersive liquid–liquid microextraction by in situ formation of an ionic liquid followed by electrothermal atomic absorption spectrometry

    I. López-García, Y. Vicente-Martínez and M. Hernández-Córdoba, J. Anal. At. Spectrom., 2012, 27, 874
    DOI: 10.1039/C2JA10378H

Search articles by author

Spotlight

Advertisements