The method consists in precipitating of potassium ions by an excess of sodium tetraphenylborate (NaTPB) in a weakly alkaline medium, filtrating and determing of the unused NaTPB by back titration with cetyltrimethylammoniumbromide solution. The test solution shall be prepared as specified in ISO 5317 or ISO 7407.
Status : WithdrawnPublication date : 1986-12
Edition : 1Number of pages : 4
Technical Committee:Fertilizers, soil conditioners and beneficial substances
A standard is reviewed every 5 years
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