ISO 3708:1976
Phosphoric acid for industrial use (including foodstuffs) — Determination of chloride content — Potentiometric method
Applicable to products having Cl- contents, expressed as chlorine, equal to or more than 0.001 % (m/m). The lower limit can be extended downwards by using weaker standard reference and volumetric solutions. Describes potentiometric titration of the ions with silver nitrate solution in a nitric acid-acetone-water medium using a silver measurement electrode and a calomel reference electrode.
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