Separation and kinetic study of chromium(III) chloro complexes by capillary electrophoresis |
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| Authors: | A Gáspár P Buglyó |
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| Institution: | (1) Department of Inorganic and Analytical Chemistry, Kossuth Lajos University, POB 21, 4010 Debrecen 10, Hungary |
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| Abstract: | 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.
Presented at Balaton Symposium on High-Performance Separation Methods, Siófok, Hungary, September 1–3, 1999 |
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| Keywords: | Capillary electrophoresis Chromium(III) chloro complexes Kinetics |
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