GB/T 6150.13-1985
鎢精礦化學分析方法 氫氧化銨-氯化銨底液極譜法測定鋅量
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