ISO 4314:1977 Preview
Surface active agents -- Determination of free alkalinity or free acidity -- Titrimetric method
This standard was last reviewed and confirmed in 2017. Therefore this version remains current.
The determination is carried out in the following way: Titration of an ethanolic or propanolic solution of the product with a standard volumetric potassium hydroxide or hydrochloric acid or sulphuric acid solution whichever is appropriate, in the presence of phenolphthalein as indicator.
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