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ISO 4316:1977 Surface active agents -- Determination of pH of aqueous solutions -- Potentiometric method
standard by International Organization for Standardization, 08/01/1977
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The determination is carried out in the following way: Potentiometric measurement of the potential difference between a glass electrode and a reference electrode dipping in an aqueous solution of the sample. This method is only applicable when so indicated in the specific standard for each product.