A clear solution of the substance is titrated with a standard volumetric hydrochloric acid solution, in the presence of methyl orange or bromophenol blue as indicator. This method is only applicable when so indicated in the specific standard for each product; in particular, it is not suitable for products containing soaps.
Status: PublishedPublication date: 1977-02
Edition: 1Number of pages: 2
Technical Committee: ISO/TC 91 Surface active agents
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