Abstract
The possible equilibria of formation for the colored ternary complex of Nb(V), Snazox (azoderivative of 8-hydroxyquinoline), and H 2O 2 are studied. It is shown that an unsaturated coordination complex is formed with a stoichiometric ratio of 1:1:2 and a relatively high conditional stability constant (p K′ d = 13.05 ± 0.55). A detailed account of the optimal experimental conditions for full color development i.e., pH, buffer solutions, ionic strength, rate of color development, order of addition of reagents, etc., is given. Beer's law is obeyed for a final concentration of Nb(V) in the range 1–10 ppm with a precision of about 1%.
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