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用硝酸铁作为指示剂,用硫氰酸钾(或硫氰酸钠硫氰酸铵)作为滴定剂进行滴定,测定结果与用铁铵钒作为指示剂的结果一致,且终点明显。
Titration with potassium ferricyanide (or sodium thiocyanate / ammonium thiocyanate) as a titrant with ferric nitrate as an indicator was consistent with the results with vanadium ammonium ferricyanide as an indicator with a clear end point.