Ion-interaction chromatographic studies on metal ions completed with Plasmocorinth B dye |
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Authors: | Corrado Sarzanini Giovanni Sacchero Maurizio Aceto Ornella Abollino Edoardo Mentasti |
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Institution: | Department of Analytical Chemistry, Via P. Giuria 5, 10125 Turin Italy |
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Abstract: | The ion-interaction chromatographic behaviour of Plasmocorinth B (a disulphonated azo dye) and of its complexes formed with metal ions in oxidation states + 2 and + 3 (Cu2+ Ni2+, Al3+, CO3+, Fe3+, Ga3+) was investigated. The effect of cationic ion-pairing agents (tetramethyl-, benzyltrimethyl- and tetrabutylammonium) was also evaluated in the presence of alkali metal ions competitors (Li+ and Na+). The effects of organic modifier and of pH were also considered. The remarkably different behaviour of the ligand and the complexes suggests the formation of M(II)L? and M(III)L22?. The stoichiometry of complexes was confirmed by applying the electrostatic theory derived from Gouy-Chapman and a modified Langmuir adsorption isotherm to the experimental data. |
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