Abstract
The triphenylmethane dyes, Chromazurol S (CAS) and Chromazurol B (CAB), react with beryllium to form the dye-rich complexes Be(CAS)/sub 2/ and Be(CAB)/sub 2/ in nonionic micellar solutions. The partition equilibria of the dyes and the complexes were spectrophotometrically studied, and the partition coefficients between the micellar and water phases were evaluated in Triton X-100, Emulgen 120, and Brij 58 micellar systems. The micellar effects, i.e., a local increase in the dye concentration in the micelles, contribute to the formation of the dye-rich complexes. Formation constants of the beryllium-CAS complex are ..beta../sub 1/ = 10/sup 4.79/ and ..beta../sub 2/ = 10/sup 7.19/. At a low CAS concentration, the formation of Be(CAS)/sub 2/ is negligible in aqueous solutions. The molar absorptivities of the dye-rich complexes are about 4 times larger than those of the 1:1 complexes. The spectrophotometric determination of beryllium using the high molar absorptivities of these complexes was performed in the Triton X-100 micellar system.
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