Home / Standards / GB/T 223.49-94 GB/T 223.49-94 Steel and alloy—Determination of total rare earth content—Extraction separation—Chlorophosphonazo mA spectrophotometric method 钢铁及合金化学分析方法 萃取分离一偶氮氯膦mA分光光度法测定稀土总量 Standard Type GBT ICS N/A CCS N/A Status N/A Issue Date N/A Implementation N/A Responsible Dept N/A Drafting Unit N/A