A sample of toluene-soluble extract from brown coal or lignite obtained by the procedure describes in ISO 975 is extracted with acetone at a temperature of 18 to 22 °C. The soluble fraction is filtered or centrifuged off and after evaporation of the solvent dried to constant mass. The percentage of acetone-soluble material is calculated from the mass of reidue after drying.

General information

  • Status :  Withdrawn
    Publication date : 1985-12
  • Edition : 2
    Number of pages : 2
  • :
    ISO/TC 27/SC 5
    Methods of analysis
  • 73.040

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