摘要
利用共振光散射技术在不引入探针的条件下,建立了室温下直接测定十二烷基苯磺酸钠(SDBS)的临界胶束浓度(CMC)的方法。研究发现:在室温下,SDBS水溶液的共振光散射强度(RLS)随SDBS浓度的增加而增强;且当SDBS接近其临界胶束浓度时,RLS强度增强显著,共振光散射峰分别位于330和396nm。396nm处的RLS强度与SDBS浓度关系曲线呈S型曲线,本文将曲线突升起点处两条切线的交点对应的SDBS浓度,确定为SDBS的临界胶束浓度(CMC),这与荧光芘探针和电导率等方法测定结果基本一致。并利用此方法分别研究了Ca2+浓度对SDBS及其SDBS-聚乙二醇辛基苯基醚(OP)复配体系聚集行为的影响。结果表明,SDBS与OP以1∶3复配时,增强了体系的抗钙能力。
A resonance light scattering （RLS） method for the determination of critical micelle concentration （CMC） of sodium dodecyl benzene sulfonate（SDBS） was proposed. Under room temperature, the RLS inten- sity of the SDBS system increased with increasing SDBS concentration. And when the concentration of SDBS approached CMC, the RLS intensity had increased sharply. The RLS peaks Were appeared at 330 nm and 396 nm, respectively. The plot of the RLS intensity at 396 nm versus SDBS concentration was S-Curve. The concentration of SDBS at the intersection point of two tangents to S-curve was considered as SBDS CMC. This result was consistent with the results of the pyrene probe fluorescence spectrometry and electrical conductivity method. The influences of the concentration of Ca^2＋ on the aggregation behave of SDBS and SDBS-emulsion OP（OP） systems were studied by the RLS method. The results indicated that the mixed system of SDBS-OP （ 1 ： 3 ） had better anti-calcium properties.
出处
《分析化学》
SCIE
EI
CAS
CSCD
北大核心
2009年第7期1061-1064,共4页
Chinese Journal of Analytical Chemistry
关键词
十二烷基苯磺酸钠
钙
临界胶束浓度
共振光散射
荧光探针
电导率
Sodium dodecyl benzene sulfonate, calcium（n）, critical micelle concentration, resonance light cattering, fluorescence probe, electrical conductivity
