title: Equilibrium dialysis of barbituric acids up to high concentrations of aqueous sodium alkylsulfonate solutions.
abstract: The partition coefficient K of four barbituric acids has been determined by the equilibrium dialysis method in aqueous solutions of sodium alkylsulfonate at 25 degrees C. The results obtained from dilute solutions to 0.3 M surfactant concentration are compared with solubility data for the same systems. The K values as deduced from Langmuir or Freundlich isotherms decrease with increasing surfactant concentration. The detergent used was an impure commercial product of known composition, which could be considered as a mixed surfactant. The change of partition coefficient with surfactant concentration as obtained from equilibrium dialysis experiments has been interpreted by assuming a continuous change of micelle composition.
mesh_terms: D000476:Alkanesulfonates; D001463:Barbiturates / Q000032:analysis*; D003956:Dialysis; D008823:Micelles; D012995:Solubility; D013501:Surface-Active Agents
chemical_list: D000476:Alkanesulfonates; D001463:Barbiturates; D008823:Micelles; D013501:Surface-Active Agents