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Database: 189759 (26 Oct 2025)
GB/T 11957-2001 English PDF
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GB/T 11957-2001
: Determination of yield of humic acids in coal
Status: Valid
GB/T 11957: Evolution and historical versions
Standard ID
Contents [version]
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Standard Title (Description)
Status
PDF
GB/T 11957-2001
English
159
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3 days [Need to translate]
Determination of yield of humic acids in coal
Valid
GB/T 11957-2001
GB/T 11957-1989
English
239
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2 days [Need to translate]
Determination of yield of humic acids in coal
Obsolete
GB/T 11957-1989
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Basic data
Standard ID
GB/T 11957-2001 (GB/T11957-2001)
Description (Translated English)
Determination of yield of humic acids in coal
Sector / Industry
National Standard (Recommended)
Classification of Chinese Standard
D21
Classification of International Standard
73.040
Word Count Estimation
6,699
Date of Issue
2001-11-12
Date of Implementation
2002-08-01
Older Standard (superseded by this standard)
GB/T 11957-1989
Quoted Standard
GB/T 212-2001;
Adopted Standard
ISO 5073-1999; MOD
Issuing agency(ies)
General Administration of Quality Supervision, Inspection and Quarantine of the People Republic of China
Summary
This standard specifies: Two coal humic acid yield determination Method, namely volumetric method and residual method (the former for arbitration), and provides measurement reagents, equipment, measurement procedure, the results of the calculation and precision. This standard applies to: lignite, bituminous coal and weathering of low metamorphic grade coal.
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