Cationic surface active agents (Hydrochlorides and hydrobromides) -- Determination of critical micellization concentration -- Method by measurement of counter ion activity

Document Number: ISO 6840:1982
File Size: 299 kB
Language: English
Provider: ANSI
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The determination is carried out as follows: Potentiometric determination of the chloride or bromide ion activity of a series of solutions of cationic surface active agents the concentration of which cover the expected micellization concentration. Plotting the graph of potential as a function of the logarithm of the concentration; the c.m.c. corresponds to the singularity on this curve. The method is applicable to purified cationic surface active agents (hydrochlorides and/or hydrobromides), which are soluble in water and which have a Krafft temperature below 60 degree Celsius.

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