This International Standard specifies a photometric method for the determination of chlorides in sodium hydroxide for industrial use. The method is applicable to products whose chloride content, expressed as chlorine (Cl), is greater than 2 mg/kg and less than 50 mg/kg. NOTE — For contents above 50 mg/kg, use the method specified in is 981, Sodium hydroxide for industrial use — Determination of chlorides — Mercurimetric method. or reduce the sample of the test solution according to the note in 7.4.3.
NBN T 03-131-1980 history
1979NBN T 03-131-1980 Sodium hydroxide for industrial use - Determination of chlorides content -Photometrie method