The speciation of rhodium(III) in hydrochloric acid media by capillary zone electrophoresis
| Authors | |
|---|---|
| Year of publication | 2002 |
| Type | Article in Periodical |
| Magazine / Source | Talanta |
| MU Faculty or unit | |
| Citation | |
| Field | Analytic chemistry |
| Keywords | rhodium(III) speciation; hydrochloric acid media; capillary zone electrophoresis |
| Description | A fast and effective method to stady the aquation of rhodium(III) chlorocomlex in hydrochloric solutions using capillary zone electrophoresis id developed. At least five species, some of which seem to be oligomeric, are formed in solution during the aquation prodess at pH>1. The fast hydration of RhCl3-/6 makes this species impossible to detect. The first species detected in the optimised conditions is RhCl5(H2O)2- although RhCl4(H2O)2- is the main species during the first stage of the aquation process. When equilibrium is reached either RhCl3(H2O)3 or a cationic complex, RhCl2(H2O)4+, is formed as the main species. Matrix Assisted Laser Desorption Ionisation Time of Flight Mass Spectrometry is used as a novel technique to elucidate the structure of the rhodium aqua/chloro complexes formed in solution. Results obtained by CZE are confirmed by spectrophotometry. |
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