ISO 2997:1974 (R2023)
Active , Reaffirmed Standard
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ISO 2997:1974 (R2023)

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

Summary

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.

Notes

90.93 : Norme internationale confirmée

Technical characteristics

Publisher International Organization for Standardization (ISO)
Publication Date 11/01/1974
Confirmation Date 10/20/2023
Edition 1
Page Count 3
EAN ---
ISBN ---
Weight (in grams) ---
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