Published: Journal of Chromatographic Science, Volume 34, Number 10, October 1996, pp. 425–430.
Equilibrium and Kinetic Studies of
Ligand-Exchange Reaction of Aluminum(III)-5-Sulfoquinoline-8-ol
Complex with Phosphate Ion by Reversed-Phase Ion-Pair Liquid
Chromatography
Y.Q. Feng, M. Shibukawa, and
K. Oguma
The reversed-phase ion-pair liquid chromatographic behavior of complexes of aluminum(III) with 5-sulfoquinoline-8-ol (HQS) on a column packed with a polystyrenedivinylbenzene copolymer is investigated with eluents that contain phosphate buffer. The aluminum(III)-HQS complex results in two peaks on the chromatograms; the heights of the peaks strongly depend on the pH of the eluent, the concentrations of HQS and phosphate buffer in the eluent, and the column temperature. The results obtained are interpreted according to the ligand-exchange reaction of aluminum(III)-HQS with H2PO4– or HPO42– in the eluent. The compositions of the mixed ligand complexes are determined, and the equilibrium and rate constants for the ligand-exchange reaction are estimated.
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