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重铬酸钾滴定法测定高铁锰矿中全铁 Rapid Determination of Total Iron in High-iron Manganese Ores by Potassium Dichromate Titration 摘要: 【目的】针对高铁锰矿中全铁含量的检测方法进行了研究，建立了磷酸、硝酸分解样品，重铬酸钾滴定高铁锰矿石中全铁含量的方法。【方法】采用磷酸、硝酸分解样品，盐酸还原测定液中高价锰，三氯化钛还原测定液中三价铁，以二苯胺磺酸钠为指示剂，用重铬酸钾氧化测定液中二价铁至三价铁，根据重铬酸钾的用量计算高铁锰矿石中全铁含量。【结果】本方法测定结果与国家标准方法（GB/T 1508－2002）测定结果一致；采用国家标准物质验证，测定结果与认定值一致，相对标准偏差(RSD, n =8)为0.26%～0.53%。【结论】该方法适用于高铁锰矿中全铁的测定，质量分数范围为0.5%～46.0%。该方法具有测定范围广、操作简单、分析速度快、重现性好、结果准确等优点，可作为高铁锰矿中全铁的定量检测方法。 Abstract: Objective A method for the determination of the total iron content in high-iron manganese ores was studied, the determination method of the total iron content in high-iron manganese ores uses phosphoric acid and nitric acid decomposition of samples and titration with potassium dichromate was established. Method Using phosphoric acid and nitric acid to decompose the sample, hydrochloric acid was used to reduce high valence manganese in the determination solution, titanium trichloride was used to reduce trivalent iron in the determination solution, using sodium diphenylamine sulfonate as an indicator, potassium dichromate was used to oxidize the divalent iron to trivalent iron, and calculate the total iron content in high-iron manganese ore based on the amount of potassium dichromate used. Result The determination results by this method were consistent with national standard methods (GB/T 1508-2002), validation using national standard substances, the determination results were consistent with the recognized values. The relative standard deviations (RSD, n =8) were between 0.26% and 0.53%. Conclusion This method is suitable for the determination of total iron in high-iron manganese ore with a mass fraction ranging from 0.5% to 46.0%. The method has the advantages of a wide determination range, simple operation, fast analysis speed, good reproducibility and accurate results, and can be used as a quantitative detection method for total iron in high-iron manganese ore.