ISO 5073:2021
Brown coals and lignites — Determination of humic acids
This document specifies volumetric methods for the determination of total humic acids and free humic acid of brown coals and lignites.
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
4.1 Total humic acids
4.2 Free humic acid
5 Reagents
6 Apparatus
7 Sample
8 Procedure
8.1 Extraction of total humic acids
8.2 Extraction of free humic acid
8.3 Determination of humic acids in extracts
8.3.1 For total humic acids
8.3.2 For free humic acids
9 Calculation and expression of results
10 Precision
10.1 Repeatability limit
11 Test report
Annex A (normative) Determination of the ratio of carbon mass fraction to humic acids mass fraction of brown coals and lignites
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
4.1 Total humic acids
4.2 Free humic acid
5 Reagents
6 Apparatus
7 Sample
8 Procedure
8.1 Extraction of total humic acids
8.2 Extraction of free humic acid
8.3 Determination of humic acids in extracts
8.3.1 For total humic acids
8.3.2 For free humic acids
9 Calculation and expression of results
10 Precision
10.1 Repeatability limit
11 Test report
Annex A (normative) Determination of the ratio of carbon mass fraction to humic acids mass fraction of brown coals and lignites