Collect. Czech. Chem. Commun. 1982, 47, 1310-1314

The dissociation constants of eriochromcyanine R and bromopyrogallol red in the presence of carbethoxypentadecyltrimethylammonium bromide (Septonex)

Vlasta Škarydová and Ludmila Čermáková

Department of Analytical Chemistry, Charles University, 128 40 Prague 2


The values of the mixed dissociation constants pKa of triphenylmethane dyes (eriochromcyanine R and bromopyrogallol red) in dependence on the concentration of cation-active tenside (1-carbethoxypentadecyltrimethylammonium bromide - Septonex) were found from spectrophotometric data and the effect of formation of micelle tenside aggregates was evaluated.