phosphate buffer; ethanol; potassium chloride in 1,4-dioxane; water T=30°C; also in the presence of CTAB, N,N-ditetradecyl-Nα-(6-trimethylammoniohexanoyl)-L-histidinamide bromide and N,N-ditetradecyl-Nα-(6-trimethyammoniohexanoyl)-L-alaninamide bromide; Equilibrium constant;