Reference number
ISO 3000:1974
ISO 3000:1974
Sodium tripolyphosphate for industrial use — Estimation of tripolyphophate content — Tris(ethylenediamine) cobalt (III) chloride gravimetric method
Edition 1
1974-12
Withdrawn
ISO 3000:1974
8050
Withdrawn (Edition 1, 1974)

Abstract

Not applicable in the presence of metaphosphate. The presence of pyrophosphate at normal concentrations Ämaximum 6 % (m/m)Ü does not interfere. The principle consists in precipitation of tripolyphosphate as its complex with tris(ethylenediamine) cobalt(III) chloride at a pH of between 3 and 4 in a buffered medium. Filtration, washing, drying and weighing of the precipitate. Details the preparation of the reagent used for analysis. Has also been approved by the IUPAC.

General information

  •  : Withdrawn
     : 1974-12
    : Withdrawal of International Standard [95.99]
  •  : 1
     : 3
  • ISO/TC 47
    71.060.50 
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