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 (Cu 2+ Ni 2+, Al 3+, CO 3+, Fe 3+, Ga 3+) 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)L 2 2−. 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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