Abstract
ABSTRACT Physicochemical measurements have been applied to study the micellar properties of some commercial surfactant systems exhibiting ultralow interfacial tension under extremely high calcium ion concentration (0.5-1.5 M). These surfactant systems were prepared from Hills B433 surfactant sample containing carboxy-methyl ethoxylated anionic and ethoxylated nonionic surfactant with an average ethylene oxide number of 4.5. Micellar dissociation concentration (mdc) values were determined by turbidity and surface tension methods at different CaCl2- concentrations. The mdc value decreases with the increase of Cacl2- concentration. UV absorption measurements were also performed in these surfactant systems by varying the surfactant and CaCl2- concentrations. The absorption peak around 277 nm has an absorbance proportional to the surfactant concentration. This peak may be useful for quantitative determination of the surfactant. Other peaks in the spectrum seem to be related with surfactant association and coul...
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