GB/T 11957-2001 in English

《GB/T 11957-2001煤中腐植酸产率测定方法》由TC42（全国煤炭标准化技术委员会）归口，TC42SC1（全国煤炭标准化技术委员会煤炭检测分会）执行，主管部门为中国煤炭工业协会。
本标准包括两种测定煤中腐植酸产率的方法，即容量法和残渣法（前者为仲裁方法），并规定了测定用的试剂、仪器设备、测定步骤、结果计算和精密度。本标准适用于褐煤、低变质程度烟煤和风化煤。

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.