本文在进一步解决了抗坏血酸稳定度的基础上,把抗坏血酸作还原滴定剂,以NH_4SCN指示终点,用于测定铁矿石中的全铁,来代替经典的重铬酸钾法。本法既简化了操作手续,也消除了汞、铬对水体的污染。并将七种含铁量不同的铁矿管理样,用新旧两种方法的测定结果进行了验证和对照,数据基本吻合,其相对误差一般不超过千分之五。 In this paper, to further solve the stability of ascorbic acid, based on the ascorbic acid reduction titrant, NH_4SCN endpoint, for the determination of total iron in iron ore, instead of the classic potassium dichromate method. This method not only simplifies the operation procedures, but also eliminates the mercury, chromium pollution of water bodies. The iron ore samples with seven different iron contents were verified and compared with those measured by the two old and new methods. The data are in good agreement with each other, and the relative error is generally no more than five thousandths.