ION-EXCHANGE STUDY OF THE COMPLEX FORMATION OF SOME CONDENSED PHOSPHATE OLIGOMERS WITH Al³⁺ AND Cu²⁺ ION

Abstract

In this paper, the complex formations of cyclo-polyphosphates and linear polyphosphates with copper(II), and aluminum ions were investigated by both cation- and anion-exchange methods. From the apparent stability constants of cyclo-polyphosphate complexes, it was shown that their complex formations with both cations are due to electrostatic forces. On the other hand, the complex formations between linear polyphosphates and cations might be ascribed to the covalent bond.