ISO 3000:1974
Withdrawn
A Withdrawn Standard is one, which is removed from sale, and its unique number can no longer be used. The Standard can be withdrawn and not replaced, or it can be withdrawn and replaced by a Standard with a different number.
Sodium tripolyphosphate for industrial use — Estimation of tripolyphophate content — Tris(ethylenediamine) cobalt (III) chloride gravimetric method
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04-23-2019
English, French
12-01-1974
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.
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