采用表面张力、电导率、紫外可见吸收光谱、恒波长同步荧光光谱法分析了典型阴离子表面活性剂十二烷基苯磺酸钠在水溶液中的临界胶束浓度(CMC). 结果表明,同步荧光光谱法测定CMC时的样品用量少,检测灵敏度高,具有较高的准确性;测定的十二烷基苯磺酸钠的第一临界胶束浓度和第二临界胶束浓度分别为1.48和6.90 mmol/L,与传统的表面张力法和电导率法的测定结果一致. 验证了同步荧光光谱法测定表面活性剂CMC的可靠性.
The critical micelle concentration of sodium dodecyl benzene sulfonate, which is a typical anion surfactant, was respectively determined by surface tension, electrical conductivity, UV-Vis absorption spectral and synchronous fluorescence spectral methods. Results show that synchronous fluorescence spectral method is characterized by less sample volume, high sensitivity, and high accuracy. The first and the second critical micelle concentrations were determined by the synchronous fluorescence spectral method to be 1.48 and 6.90 mmol/L respectively, which are well consistent with those data from the traditional surface tension and electrical conductivity methods, thus, verifying the reliability of synchronous fluorescence spectrometry to measure the critical micelle concentrations of surfactants.
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