ISO 3000:1974

Sodium tripolyphosphate for industrial use — Estimation of tripolyphophate content — Tris(ethylenediamine) cobalt (III) chloride gravimetric method

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.

OEN:

ISO

Langue:

English

Code(s) de l'ICS:

71.060.50

Statut:

Annulée

Date de Publication:

1974-11-30

Numéro Standard:

ISO 3000:1974