Abstract 

Dissolution of a test portion taken from the laboratory sample, previosly ground and sifted. Addition of formaldehyde to transform any ammonium ions present into hexamethylenetetramine and of the disodium salt of ethylenediamin tetra-acetic acid to complex any extraneous cations present which could cause excessive errors. These additions have no detrimental effect on the precision or reproduciblility of the method. Precipitation of the potassium by sodium tetraphenylborate in a weakly alkaline medium. Drying and weighing of the precipitate.


General information

  • Status :  Withdrawn
    Publication date : 1973-04
  • Edition : 1
    Number of pages : 3
  • :
    ISO/TC 47
    Chemistry
  • 71.060.50
    Salts

Got a question?

Check out our FAQs

Customer care
+41 22 749 08 88

Opening hours:
Monday to Friday - 09:00-12:00, 14:00-17:00 (UTC+1)

Keep up to date with ISO

Sign up to our newsletter for the latest news, views and product information