GB/T 6150.9-1985
钨精矿化学分析方法 氯代磺酚S光度法测定铌量丁基罗丹明B萃取光度法测定钽量
Methods for chemical analysis of tungsten concentrates--The chlorosulphophenol S photometric method for the determination niobium content--The butylrhodamine B extraction photometric method for the determinati
GBT6150.9-1985, GB6150.9-1985