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ISO 4311:1979Published

Anionic and non-ionic surface active agents — Determination of the critical micellization concentration — Method by measuring surface tension with a plate, stirrup or ring

Agents de surface anioniques et non ioniques — Détermination de la concentration critique pour la formation de micelles — Méthode par mesurage de la tension superficielle à la lame, à l'étrier ou à l'anneau

Abstract / scope

The method is carried out in the following way: Determination of the surface tension of a series of solutions whose concentrations bracket the critical micellization concentration. Plotting of the graph of surface tension as a function of the logarithm of the concentration: the critical micellization concentration corresponds to a singular point on this curve. In this point the curve shows a sharp change of slope.