ISO 4315:1977 Preview
Surface active agents -- Determination of alkalinity -- Titrimetric method
This standard was last reviewed and confirmed in 2017. Therefore this version remains current.
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.
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