Adsorptivity and rinsability of built detergents using radiotracers. I

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Abstract
Linear, primary alcohol sulfates and linear alkylbenzene sulfonates tagged with radioactive sulfur or, in one case, tritium, were employed to determine adsorptivity and rinsability characteristics.In the rinsability studies it was found that when using scoured cotton as substrate the linear, primary alcohol sulfates leave a slightly lower residue than the sulfonates. Both surfactants almost reach an equilibrium after the first washdry cycle. The surfactants are present on the surface in a reversibly adsorbed state as shown by exchange experiments with unlabelled surfactants.In the adsorption experiments, run under the same conditions as the rinsability experiments, Langmuir‐type isotherms are obtained whose equilibrium values are comparable to the rinsability values.The effect of free detergent alcohol concentration on adsorptivity and rinsability in linear, primary alcohol sulfate built detergent formulations was also studied.