Abstract
An electrode, selective to the dodecyl sulphate anion, has been evaluated for use in surfactant solutions containing polymers and a protein. Results obtained with the electrode have been used directly to construct surfactant ion binding isotherms which show similar regions of change to those previously established in the literature by indirect methods. It is shown that when equilibrium dialysis measurements are used to construct surfactant anion binding isotherms, it is only in the presence of a swamping amount of common cation that this method gives a true indication of the unbound surfactant ion concentration.
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