THE EFFECT OF SURFACTANTS ON THE ACID-BASE BEHAVIOR OF METHYL RED .2.A SPECTROPHOTOMETRIC COMPARISON OF THE EFFECT OF TRITON-X-100 AND BETA-CYCLODEXTRIN

The effect of the non-ionogenic surfactant Triton X-100 (TX) and beta- cyclodextrin (CD) on the absorption bands of methyl red was examined. The interactions of methyl red with the both substances were studied b ased on changes in the absorption curves after their resolution into G aussian bands. The conditional dissociation constants of methyl red we re determined at various concentrations of the additives (in the case of TX, both below and above its cmc value). At c(TX) = 0.06 mol l-1 th e change in the conditional dissociation constant of methyl red was DE LTApK(a) = -0.58 and at c(CD) = 6 mmol l-1 the DELTApK(a) value was id entical.