一、前言经典的重铬酸钾容量法测定铁,由于有快速、准确、适应广、易掌握、成本低等优点而长期广泛地被囡内外分析工作者所采用。但汞盐污染环境,有些分析工作者已为此相继研究了无汞测铁的方法,如用甲基兰、硅钼酸、钨酸钠等控制还原终点或钛量法等等。但这些方法或因分析手续长、或因操怍液不稳定等原因未被广泛使用。遵照毛主席以“预防为主”和“为人民服务”的教导,我国分析工作者在开展不用汞测定铁的工作中,也取得了可喜的 I. INTRODUCTION The classic determination of iron by potassium dichromate volumetric method has long been widely adopted by analysts inside and outside the country for its rapid, accurate, widely adapted, easy to grasp and low cost advantages. However, mercury salts pollute the environment, and some analysts have successively studied the mercury-free method for measuring iron, such as methyl blue, silicomolybdic acid, sodium tungstate, etc. to control the reduction of end point or titanium method and so on. However, these methods may not be widely used due to long processing time or unstable operation. Following Chairman Mao’s teachings of “prevention first” and “serving the people”, analysts in our country have also made gratifying achievements in carrying out the work of measuring iron without mercury