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Spectrophotometry study of the reaction between dyes of the alizarin green series and vanadates in the presence of cetylpyridinium cation

J. Šimek, Nguyen Truong Son, and E. Ružička

Department of Analytical and Organic Chemistry, Faculty of Natural Sciences, Palacký University, CS-771 46 Olomouc

 

Abstract: The reaction between six dyes of the alizarin green series (L) and vanadates (V) in the presence of cetylpyridinium ion (CPy+, S) was studied. Provided the concentration of surfactant was lower than the critical micellar concentration, defined ternary complexes of the type VL2S4 or VL2S6 arose in the solution. The values of equilibrium constants of the investigated complex-forming equilibria were determined and a method of photometric and chelatometric determination of vanadium in the interval 4.5—60 μg and 0.05—6 mg was proposed. The mechanism of ternary complex formation was also explained.

Full paper in Portable Document Format: 391a91.pdf

 

Chemical Papers 39 (1) 91–101 (1985)

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