Home / Standards / GB 6150.17-85 GB 6150.17-85 Methods for chemical analysis of tungsten concentrates — The bismuth content determination by semi-xylenol orange photometric method 钨精矿化学分析方法 半二甲酚橙光度法测定铋量 Standard Type GB ICS N/A CCS N/A Status N/A Issue Date N/A Implementation N/A Responsible Dept N/A Drafting Unit N/A