ISO 2993:1974
Ammonium sulphate for industrial use; Determination of free acidity; Titrimetric method

Standard No.

ISO 2993:1974

Release Date

1974

Published By

International Organization for Standardization (ISO)

Latest

ISO 2993:1974

Scope

Applicable to products having a free acidity, expressed as H2 SO4 , equal to or more than 0.01 % (m/m). Dissolution of a test portion in Water and titration with standard volumetric sodium hydroxide solution in the presence of an indicator. The indicator must have a colour change in the pH range between 5.2 and 5.6. Has also been approved by the IUPAC.

ISO 2993:1974 history

• 1974 ISO 2993:1974 Ammonium sulphate for industrial use; Determination of free acidity; Titrimetric method