ISO 7404-4:2017
Methods for the petrographic analysis of coals — Part 4: Method of determining microlithotype, carbominerite and minerite composition

Standard No.

ISO 7404-4:2017

Release Date

2017

Published By

International Organization for Standardization (ISO)

Latest

ISO 7404-4:2017

Scope

This document specifies a method, using a graticule with 20 crossline intersections, for determining the proportions of microlithotypes, carbominerite and minerite in coals. It applies only to determinations made on polished particulate blocks using reflected white light (about 400 nm to 700 nm). Additional blue, blue-violet or UV light excitation (365 nm to 440 nm) for better identification of liptinite in fluorescence may be used especially at low rank coals.

ISO 7404-4:2017 Referenced Document

• ISO 7404-1 Methods for the petrographic analysis of coals - Part 1: Vocabulary
• ISO 7404-2 Methods for the petrographic analysis of coals - Part 2: Methods of preparing coal samples

ISO 7404-4:2017 history

• 2017 ISO 7404-4:2017 Methods for the petrographic analysis of coals — Part 4: Method of determining microlithotype, carbominerite and minerite composition
• 1988 ISO 7404-4:1988 Methods for the petrographic analysis of bituminous coal and anthracite; part 4: method of determining microlithotype, carbominerite and minerite composition