Summary
Three Cr(III) species (dichlorotetraaquachromium (III), [CrCl2(H2O)4]+; monochloropentaaquachromium(III), [CrCl(H2O)5]2+; and hexaaquachromium(III), [Cr(H2O)6]3+) have been separated and determined by capillary electrophoresis. The first two complexes could be detected in direct mode in phosphate buffer, but because the absorption of complex [Cr(H2O)6]3+ is poor in the UV range, indirect UV detection had to be used. For indirect detection 5 mM imidazole was added to the buffer solution. The formation and decomposition of the different Cr(III) complexes were monitored in time after the preparation of solutions of CrCl3.6H2O. The slowest process was the decomposition of [CrCl(H2O)5]2+; 300 h after preparation of a solution of CrCl3.6H2O of pH 1 the solution contained only [Cr(H2O)6]3+. The effects of pH and the content of some matrix ions on the rates of conversion of the complexes were studied. The kinetic characteristics of this complex system could be investigated adequately by means of capillary electrophoresis.
Similar content being viewed by others
References
S. A. Katz, H. Salem, The Biological and Environmental Chemistry of Chromium, VCR, New York, 1994.
E. D. Zlotorzynska, E. P. C. Lai, A. R. Timerbaev, Anal. Chim. Acta359, 1 (1998).
C. L. Rollinson, J. C. Bailar, H. J. Emelens, R. Nyholm, A. F. Trotman-Dickensen, Comprehensive Inorganic Chemistry, Vol. 3, Pergamon, New York, 1971.
A. Cotton, G. Wilkinson, Advanced Inorganic Chemistry, 5th edn, Wiley, New York, 1988, p. 686.
B. Glod, E. Pobozy, S. Marczak, M. Trojanowitz, Acta Chromatogr.6, 39 (1996).
M. Thompson, R. E. Connick, Inorg. Chem.20, 2279 (1981).
W. Beck, H. Engelhardt, Chromatographia33, 313 (1992).
N. Bjerrum, Ph. D. Dissertation, Copenhagen, 1908.
R. J. Angelici, Synthesis and Techniques in Inorganic Chemistry, 2nd edn, Sounders, Philadelphia, 1977, p. 63.
H. Stünzi, L. Spiccia, F. P. Rotzinger, W. Marty, Inorg. Chem.28, 66 (1989).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Gáspár, A., Buglyó, P. Separation and kinetic study of chromium(III) chloro complexes by capillary electrophoresis. Chromatographia 51, S143–S147 (2000). https://doi.org/10.1007/BF02492797
Received:
Revised:
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/BF02492797