重铬酸钾容量法测定铁具有准确度高、速度快等优点,但因使用毒剂汞盐,严重污染环境,损害人体健康。因此,推广“无汞测铁”具有重要的意义。在北京矿冶研究院、昆明冶金研究所和云南地质研究所的工作基础上,我们采用锡(Ⅱ)还原大量铁(Ⅲ)、继以钛(Ⅲ)还原至终点,钨酸判别铜(Ⅱ)催化溶解氧氧化过剩钛(Ⅲ)的过 Determination of potassium dichromate volume method has the advantages of high accuracy, high speed, but due to the use of toxic mercury salts, serious environmental pollution, damage to human health. Therefore, to promote “mercury-free measuring iron” is of great significance. Based on the work of Beijing Institute of Mining and Metallurgy, Kunming Institute of Metallurgy and Yunnan Institute of Geology, we use a large amount of iron (Ⅲ) to reduce with tin (Ⅱ), and then reduce to the end with titanium (Ⅲ) Catalytic oxidation of excess titanium (Ⅲ) over