几十年来,国内外测铁工作中,大多采用传统的重铬酸钾容量法(即SnCl_2-HgCl_2还原氧化K_2Cr_2O_7容量法),此法具有准确、快速及易于掌握的优点。但使用有毒的氯化高汞,污染环境,有害人类健康是其缺点。多年来,特别是文化大革命以来,我国的分析工作者在改进容量法测铁及消除汞害的实践中,进行了大量工作,取得了丰硕成果。兹分述如下。一、改进重铬酸钾容量法在改进重铬酸钾容量法测铁的工作中,主要是废弃汞盐,改进还原工序。这方面作了很多工作。分以下五点: 1.采用三氯化钛还原铁~(8+):过量的钛~(3+)用 For decades, the traditional domestic potassium dichromate volumetric method (that is, the SnCl2-HgCl2 reduction K 2 Cr 2 O 7 volumetric method) is mostly used in the iron and steel work both at home and abroad. The method has the advantages of being accurate, rapid and easy to grasp. However, it is disadvantageous to use toxic chlorinated high-mercury, polluting the environment and harmful to human health. Over the past years, especially since the Cultural Revolution, our country’s analysts have done a great deal of work and achieved fruitful results in improving the capacity of measuring iron and eliminating mercury damage. It is divided as follows. First, to improve the capacity of potassium dichromate In the improvement of potassium dichromate capacity test iron work, the main waste mercury salt, improve the reduction process. Much has been done in this regard. The following five points: 1. The use of titanium trichloride reduction of iron ~ (8 +): excessive titanium ~ (3 +) with