GB/T 6150.13-1985
钨精矿化学分析方法 氢氧化铵-氯化铵底液极谱法测定锌量
Methods for chemical analysis of tungsten concentrates--The ammonium hydroxide-ammonium chloride supporting electrolyte polarographic method for the determination of zinc content
GBT6150.13-1985, GB6150.13-1985