Повучен
ISO 7404-3:2009 specifies a method for determining the proportions of the maceral groups (and the minerals, if desired) in coals. ISO 7404-3:2009 is applicable only to determinations made on polished particulate blocks using incident white light. For lower-rank coals, the additional use of the fluorescence mode is necessary to identify liptinites.
ПОВУЧЕН
ISO 7404-3:1994
ПОВУЧЕН
ISO 7404-3:2009
95.99
Повучен
27. 10. 2025.