Reference number
ISO 4311:1979
ISO 4311:1979
© ISO 2025
International Standard
ISO 4311:1979
Anionic and non-ionic surface active agents — Determination of the critical micellization concentration — Method by measuring surface tension with a plate, stirrup or ring
Edition 1
1979-06
1979-06
ISO 4311:1979
10177
Published
(Edition 1, 1979)
This publication was last reviewed and confirmed in 2022.
Therefore this version remains current.
Abstract
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.