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本文解决了SnCl_2在非水溶液中稳定性的基础上,把SnCl_2作为还原滴定剂,在酸性介质中,以磷钼酸为指示剂,用以代替重铬酸钾法测定铁矿石中的全铁。本法不仅简化了操作手续,而且消除了HgCl_1、C(?)_2O_(?)~(2-)对水体的污染。用本法对7种含铁量不同的铁矿管理样进行测定,結果与原结果基本吻合。铁含量控制在25—200毫克/100毫升范围内,其相对误差都不超过千分之五。
This article solves the stability of SnCl_2 in non-aqueous solution, based on SnCl_2 as a titration reagent in acidic medium, with phosphomolybdic acid as an indicator to replace potassium dichromate method for determination of iron in iron . This method not only simplifies the operation procedures but also eliminates the water pollution of HgCl_1, C (?) _2O _ (?) ~ (2-). This method was used to determine the seven iron ore samples with different iron contents. The results are in good agreement with the original results. Iron content control in the 25-200 mg / 100 ml range, the relative error is not more than five thousandths.