The sample of brown coal or lignite is extracted with boiling 0,005 N hydrochloric acid and the extract centrifuged. The sodium and potassium in solution are determined by any precise analytical method (for example, gravimetric method or flame photometric method).

General information

  • Status :  Withdrawn
    Publication date : 1976-06
  • Edition : 1
  • :
    ISO/TC 27
    Solid mineral fuels
  • 73.040

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