Abstract

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.


General information 

  • Status
     :  Withdrawn
    Publication date
     : 1983-12
  • Edition
     : 1
    Number of pages
     : 3
  • Technical Committee
     : ISO/TC 134 Fertilizers, soil conditioners and beneficial substances
  • ICS
     :
    65.080 Fertilizers

Life cycle


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