Phosphoric acid for industrial use — Determination of sulphate content — Method by reduction and titrimetry

The information about the standard:

Designation standards: ISO 2997:1974
Publication date standards: 1.11.1974
The number of pages: 3
Approximate weight : 9 g (0.02 lbs)
Country: International technical standard
Kategorie: Technické normy ISO

Annotation of standard text ISO 2997:1974 :

Description / Abstract: Applicable to products having sulphate contents equal to or more than 0.0005 % (m/m). Analysis by reduction of the sulphate to sulphide by a mixture of hydriodic acid and hypophosphorus acid. Absorption of the hydrogen sulphide evolved in a mixture of acetone and sodium hydroxide solution. Titration with a standard volumetric solution of mercury(II) acetate in the presence of dithizone as indicator. Has also been approved by the IUPAC.