GB/T 223.66-1989
钢铁及合金化学分析方法 硫氰酸盐-盐酸氯丙嗪-三氯甲烷萃取光度法测定钨量
Methods for chemical analysis of iron,steel and alloy--The thiocyanate-chlorpromazine hydrochloride-chloroform extraction photometric method for the determination of tungsten content
GBT223.66-1989, GB223.66-1989