EN ISO 2871-1 Surfactants - Detergents - Determination of Cationic-Active Substance Content

The ISO 2871-1 standard developed by the International Organization for Standardization (ISO), quaternary ammonium compounds in which two of the alkali groups each contain 10 or more carbon atoms, and Imidazoline or 1-methylimidaxoline, in which the long chain acylaminoethyl and alkyl groups are substituted at the 2- and 3-positions, respectively. Specifies a method for the determination of high molecular mass cationic active materials, such as salts.

This method can be applied to solids or aqueous solutions of the active substance when the relative molecular mass of the cationic-active substance is known or it has been determined beforehand whether its content is expressed in percent by mass. The method is not applicable if anionic surfactants are present.

The low relative molecular mass sulfonates of toluene and xylene, which exist as hydrotropes, are immiscible when present at concentrations up to and including 15% relative to the active material. At higher levels, their effects must be evaluated in each particular case.

Nonionic surfactants, soap, urea and tetraacetic acid salts are immiscible.

Detergent formulations include sodium chloride, sulfate, borate, tripolyphosphate, perborate, silicate, etc. Typical inorganic compounds such as perborate will not mix, but bleaching agents other than perborate will be removed prior to analysis and the sample will be completely soluble in water.

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