Reference number
ISO 2997:1974
ISO 2997:1974
© ISO 2024
International Standard
ISO 2997:1974
Phosphoric acid for industrial use — Determination of sulphate content — Method by reduction and titrimetry
Edition 1
1974-11
1974-11
ISO 2997:1974
8047
Publicado
(Edición 1, 1974)
Esta publicación se revisó y confirmó por última vez en 2023.
Por lo tanto, esta versión es la actual.
Resumen
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.
Ciclo de vida
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Anteriormente
RetiradaISO/R 847:1968
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Ahora