Abstract
The formation of cadmium 8-oxyquinoline (HOx) complexes in water and a 0.01 M aqueous solution of sodium dodecyl sulfate (293 K, 0.01) was studied by pH-metric titration. Mathematical simulation of the most probable equilibria gave complex formation constants logβ1 = 6.17 ± 0.32 (CdOx+) and logβ2 = 14.60 ± 0.14 (CdOx2) in aqueous solution and apparent stability constants logβ1 = 8.64 (CdOx+) and logβ2 = 17.59 (CdOx2) in a solution of dodecyl sulfate. The solubility of cadmium dioxyquinolate in water at pH from 3 to 6 and a micellar sodium dodecyl sulfate medium was determined by the method of saturated solutions. The solubility product pLp = 21.3 ± 0.9 (H2O, 293 K) was calculated by modeling the solution of CdOx2 with taking into account all acid-base interactions and complex formation reactions.
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