介绍了以溴甲酚绿为指示剂，用氢氧化钠滴定游离硝酸，然后在醋酸-醋酸钠缓冲溶液中以EDTA络合滴定铜（），再用铁铵矾为指示剂，在稀硝酸介质中以硫氰酸盐滴定银。
In the silver electrolyte , free nitric acid was titrated with sodium hydroxide used bromcresol green as indicator . Copper was determined by EDTA compleximetry in the Hac-NaAc buffering solution .
氰酸银