GB/T 11276-2007
ActiveSurface active agents - Determination of the critical micellization concentration
表面活性剂 临界胶束浓度的测定
Catalogue
前言 → 1 范围 → 2 规范性引用文件 → 3 术语和定义 → 4 原理 → 5 试剂和材料 Foreword → 1 Scope → 2 Normative References → 3 Terms and Definitions → 4 Principle → 5 Reagents and Materials
Scope
This standard specifies the determination of the critical micellization concentration of surface active agents. The counterion activity measurement method in this standard is applicable to the determination of the critical micellization concentration of cationic surface active agents; the ring method for surface tension measurement is applicable to the determination of the critical micellization concentration of anionic and nonionic surface active agents.
本标准规定了表面活性剂临界胶束浓度的测定。本标准中反离子活度测量法适用于阳离子表面活性剂临界胶束浓度的测定；圆环测定表面张力法适用于阴离子和非离子表面活性剂临界胶束浓度的测定。
Normative References
Keywords
Application Summary AI generated
Chemists and quality control professionals in industries such as chemicals, personal care, and textiles use this standard to determine the critical micellization concentration (CMC) of surfactants. This parameter is essential for understanding surfactant aggregation behavior and optimizing formulations like detergents and emulsifiers. Accurate CMC measurement ensures product quality and performance in practical applications.
化学、日化、纺织等行业的技术人员使用该标准来测定表面活性剂的临界胶束浓度。该参数对于理解表面活性剂在溶液中的聚集行为、优化配方设计（如洗涤剂、乳化剂）至关重要。通过准确测定CMC，可以控制产品质量和性能，确保表面活性剂在实际应用中达到最佳效果。
AI Summary AI generated
This standard specifies two methods for determining the critical micellization concentration (CMC) of surfactants: the counterion activity measurement method for cationic surfactants, and the ring method for surface tension measurement for anionic and nonionic surfactants. It references GB/T 5549 and GB/T 6373, and defines terms such as micelle, CMC, and Krafft temperature. By measuring potential or surface tension and plotting against concentration logarithm, the singular point on the curve gives the CMC. This standard consolidates and replaces GB/T 11275-1989 and GB/T 11278-1989, providing a unified method for surfactant performance evaluation.
本标准规定了表面活性剂临界胶束浓度（CMC）的两种测定方法：反离子活度测量法适用于阳离子表面活性剂，圆环测定表面张力法适用于阴离子和非离子表面活性剂。标准引用了GB/T 5549和GB/T 6373，并定义了胶束、临界胶束浓度和克拉夫特点等术语。通过电位或表面张力测量，绘制浓度对数与电位或表面张力的关系曲线，曲线上的奇点即为CMC。该标准整合并替代了GB/T 11275-1989和GB/T 11278-1989，为表面活性剂性能评价提供了统一方法。
Key Sentences extracted from text
本标准规定了表面活性剂临界胶束浓度的测定。
本标准中反离子活度测量法适用于阳离子表面活性剂临界胶束浓度的测定；圆环测定表面张力法适用于阴离子和非离子表面活性剂临界胶束浓度的测定。
以甘汞电极和氟离子选择电极组成的电池测定一系列浓度包括预期临界胶束浓度的阳离子表面活性剂溶液的电位，根据能斯特方程，即相应于氟离子-反离子活度，作出电位与浓度对数的函数图，临界胶束浓度相当于图上的奇点。
测定一系列不同浓度的阴离子和非离子表面活性剂溶液的表面张力，其浓度包括临界胶束浓度。
以表面张力作纵坐标，以浓度的对数作横坐标的曲线，这曲线上的奇点即为临界胶束浓度。
This standard specifies the determination of the critical micellization concentration of surface active agents.
The counterion activity measurement method in this standard is applicable to the determination of the critical micellization concentration of cationic surface active agents; the ring method for surface tension measurement is applicable to the determination of the critical micellization concentration of anionic and nonionic surface active agents.
Using a cell composed of a calomel electrode and a fluoride ion selective electrode, measure the potential of a series of cationic surfactant solutions including concentrations around the expected critical micellization concentration; according to the Nernst equation, i.e., corresponding to the fluoride-counterion activity, plot the potential as a function of the logarithm of concentration, and the critical micellization concentration corresponds to the singular point on the graph.
Measure the surface tension of a series of anionic and nonionic surfactant solutions at different concentrations, including the critical micellization concentration.
Plot a curve with surface tension as the ordinate and the logarithm of concentration as the abscissa; the singular point on this curve is the critical micellization concentration.
Standard Timeline
Changes from replaced version:
- 标准名称改为'表面活性剂 临界胶束浓度的测定'
- 将两个国家标准中相同内容合并成一个章节
- 增加了前言
- Standard name changed to 'Surface active agents - Determination of the critical micellization concentration'
- Merged the same content from two national standards into one chapter
- Added foreword