ISO 3000:1974
Sodium tripolyphosphate for industrial use; Estimation of tripolyphophate content; Tris(ethylenediamine) cobalt (III) chloride gravimetric method
- Standard No.
- ISO 3000:1974
- Release Date
- 1974
- Published By
- International Organization for Standardization (ISO)
- Status
- 2002-05
- Latest
- ISO 3000:1974
- Scope
- Not applicable in the presence of metaphosphate. The presence of pyrophosphate at normal concentrations ?maximum 6 % (m/m)? 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.
ISO 3000:1974 history
- 1974 ISO 3000:1974 Sodium tripolyphosphate for industrial use; Estimation of tripolyphophate content; Tris(ethylenediamine) cobalt (III) chloride gravimetric method
