EVS 669:2022

This Estonian standard specifies a method for the determination of the ash of oil shale from various deposits or solid residues from its thermal processing and combustion.
In this standard, ash is determined on samples of trade oil shale, oil shale used for research, enrichment residue and other samples of the above- mentioned substances taken and prepared for analysis in accordance with EVS 668.
NOTE The ash yield depends on the amount of inorganic compounds in oil shale or in the solid residues of its thermal processing and combustion, and the conditions of incineration. Therefore, in order to ensure comparability in the determination of ash, it is necessary to strictly observe the conditions of combustion.