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ISO 5318:1983

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

Publication date:   Dec 1, 1983

95.99   Withdrawal of Standard   Jul 30, 2004

General information

95.99   Withdrawal of Standard   Jul 30, 2004

ISO

ISO/TC 134 Fertilizers, soil conditioners and beneficial substances

International Standard

65.080   Fertilizers

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Scope

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.

Life cycle

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WITHDRAWN
ISO 5318:1983
95.99 Withdrawal of Standard
Jul 30, 2004