铝片还原-重铬酸钾滴定法测定硫铁矿中铁的改进

Improvement on the method for Determination of Iron in Pyrites by Potassium Dichromate Titrimetry with Aluminium Tablet Reduction

摘要: 针对氯化亚锡-氯化汞-重铬酸钾法测定铁的含量时，汞对环境有污染问题，文章采用隔绝空气的方法用铝还原三价铁，在盐酸介质中用重铬酸钾标准滴定溶液滴定二价铁。方法精密度（RSD，n=5）低于1％，用于硫铁矿中铁的测定，结果可靠。

Abstract: In view of the environmental pollution from mercury in determination of iron by means of stannous chloridemercury chloridepotassium dichromate titration, a new method without use of mercury reagent is proposed in this paper. By cutting off air, aluminium tablet is used to reduce ferric to ferrous and then ferrous is determined by potassium dichromate titrimetry. The method is reliable with precision of 0.61%RSD(n=5) and suitable for the determination of iron in pyrites.