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Type: Journal article
Title: Separation of chromium (III) and chromium (VI) by capillary electrophoresis using 2,6-pyridinedicarboxylic acid as a pre-column complexation agent
Author: Chen, Zuliang
Naidu, Ravendra
Subramanian, Avudainayagam
Citation: Journal of Chromatography A. 2001; 927(01-Feb): 219-227
Publisher: Elsevier Science BV
Issue Date: 2001
ISSN: 0021-9673
School/Discipline: School of Earth and Environmental Sciences
Statement of
Zuliang Chen, Ravendra Naidu and Avudainayagam Subramanian
Abstract: A simple method was developed for the simultaneous determination of Cr(III) and Cr(VI) by capillary zone electrophoresis (CZE), where Cr(III) was chelated with ligands to form anionic complexes. Nitrilotriacetic acid, N-2-hydroxyethylenediaminetriacetic acid, ethylenediaminetetraacetic acid, diethylenetriaminepentaacetic acid, and 2,6-pyridinedicarboxylic acid (PDCA) were investigated as Cr(III) complexing ligands. Of all the ligands studied, 2,6-PDCA with Cr(III) gave the largest UV response and high selectivity for Cr(III). In addition, the condition for pre-column derivatization, including pH, concentration ratio [Cr(III)/2,6-PDCA] and the stability of Cr(III) complexes were also examined. The separation of anionic forms of Cr(III) and Cr(VI) was achieved using co-CZE with UV detection at 185 nm. The electrolyte contained 30 mM phosphate, 0.5 mM tetradecyltrimethylammonium bromide, 0.1 mM 2,6-PDCA and 15% (v/v) acetonitrile at pH 6.4. The detection limits were 2 μM for Cr(III) and 3 μM for Cr(VI) and linear plots were obtained in a concentration range of 5–200 μM. The utility of the method was demonstrated for the determination of Cr(III) and Cr(VI) in contaminated soils.
DOI: 10.1016/S0021-9673(01)01116-5
Appears in Collections:Earth and Environmental Sciences publications

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