Abstract
Abstract Adsorption of sodium dodecyl sulfate (NaDS) and calcium dodecyl sulfate (Ca(DS)2) at the aqueous surface was measured by a radiotracer method using tritium labelled compounds at constant ionic strength of 1×10−2 and 7.5×10−3 adjusted by the addition of NaCl and CaCl2, respectively. The adsorbed amounts increased with increasing concentration of dodecyl sulfates in both cases, and approached saturation values of 3.65×10−10 mol/cm2 at 25°C for NaDS and 3.8×10−10 mol/cm2 at 55°C for Ca(DS)2. The amounts calculated from surface tension data by applying the Gibbs adsorption isotherm were confirmed to be in good agreement with the values directly measured. The adsorbed amounts of chloride ion, generally assumed to be zero, were confirmed to be negligible in the concentration region from zero up to critical micelle concentration.
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