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Status : Withdrawn
Standard Type : Main
Document Year : 1985
Pages : 2
Edition : 2
Section Volume : Methods of analysis (ISO/TC 27/SC 5.)
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.