ISO 5318:1983

Fertilizers — Determination of potassium content — Potassium tetraphenylborate gravimetric method (Reference method)

The method consists in preparing of a test solution as specified in ISO 5317, precipitating of potassium ions by sodium tetraphenylborate in a weakly alkaline medium in the presence of disodium ethylenediaminetetraacetate dihydrate (EDTA, disodium salt) and formaldehyde, followed by filtrating of the precipitate, drying and weighing.

OEN:

ISO

Langue:

English

Code(s) de l'ICS:

65.080

Statut:

Annulée

Date de Publication:

1983-11-30

Numéro Standard:

ISO 5318:1983