ISO 2993:1974

Ammonium sulphate for industrial use — Determination of free acidity — Titrimetric method

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.

OEN:

ISO

Langue:

English

Code(s) de l'ICS:

71.060.50

Statut:

Publié

Date de Publication:

1974-03-31

Numéro Standard:

ISO 2993:1974