This part of GB/T 18856 specifies the reagents, instruments and equipment, analysis steps, result calculation and precision for the determination of nitrogen content in coal-water slurry. This section applies to all kinds of coal water slurry.
2002GB/T 18856.12-2002 Test methods for quality of coal water mixture--Part 12: Determination of nitrogen of coal water mixture
GB/T 18856.12-2002 Test methods for quality of coal water mixture--Part 12: Determination of nitrogen of coal water mixture was changed to GB/T 19227-2008 Determination of nitrogen in coal.