GB/T 11957-2001
Determination of yield of humic acids in coal (English Version)

Standard No.

GB/T 11957-2001

Language

Chinese, Available in English version

Release Date

2001

Published By

General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China

Latest

GB/T 11957-2001

Replace

GB/T 11957-1989

Scope

This standard includes two methods for determining the yield of humic acid in coal, namely the volumetric method and the residue method (the former is an arbitration method), and specifies the reagents, instruments and equipment, measurement steps, result calculation and precision for the determination. This standard is applicable to lignite, bituminous coal with low degree of metamorphism and weathered coal.

GB/T 11957-2001 history

• 2001 GB/T 11957-2001 Determination of yield of humic acids in coal
• 0000 GB/T 11957-1989