The application of ion‐exchangers in detergent analysis

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Abstract
A method is described for the separation of mixtures of the sodium salts of some alkylsulphuric or sulphonic acids, fatty acids and non‐ionic material into three fractions containing strong acid, weak acid, and non‐ionic constituents respectively. To this end, the mixtures are successively passed over the ion‐exchangers Dowex‐50, X8, [H+], Dowex‐1, X2, [Ac−], and Dowex‐2, X8, [OH−]. The individual acids can be titrated potentiometrically. From the amount of titrant used and the weight of the salts formed as a result of the titration, both the contents and the molecular weights of the acids can be calculated. The content of non‐ionic constituents can be determined gravimetrically.

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