Home / Standards / GB/T 19227-2008 GB/T 19227-2008 Active Determination of nitrogen in coal 煤中氮的测定方法 Standard Type GBT ICS 73.040 CCS D21 Status 现行 Issue Date 2008-07-29 Implementation 2009-05-01 Responsible Dept 中国煤炭工业协会 Drafting Unit N/A