Home / Standards / GB/T 3654.9-1983 GB/T 3654.9-1983 Active Methods for chemical analysisof ferroniobium--The thiocyanate photometric method for the determination of tungsten content 铌铁化学分析方法 硫氰酸盐光度法测定钨量 Standard Type GBT ICS 77.100 CCS H11 Status 现行 Issue Date 1983-05-02 Implementation 1984-03-01 Responsible Dept 中国钢铁工业协会 Drafting Unit N/A