经典的重铬酸钾容量法测定铁,由于汞盐污染环境,故近来广大分析工作者对该法进行改进,积极摸索不用汞盐的重铬酸钾容量法。根据有关资料介绍,不用汞盐的重铬酸钾容量法有:硅钼黄—重铬酸钾法;钨兰—重铬酸钾法;甲基橙—重铬酸钾法;中性红—重铬酸钾法和铝(锌)还原—重铬酸钾法等等。我们从实践中体会到硅钼黄—重铬酸钾法精确度较高,干扰元素少,分析手续简单,排除了汞盐对环境的污 The classic potassium dichromate volumetric method for the determination of iron, mercury salts as the pollution of the environment, so the recent analysis of the majority of workers to improve the law, and actively explore the mercury potassium dichromate volume method. According to the information, without mercury salts of potassium dichromate capacity method are: silicon molybdenum yellow - potassium dichromate method; tungsten - potassium dichromate method; methyl orange - potassium dichromate method; neutral red - Potassium dichromate method and aluminum (zinc) reduction - potassium dichromate method and so on. We know from practice that molybdenum-molybdate yellow-potassium dichromate method has higher accuracy, less interference elements, simple analysis procedures, and eliminates mercury pollution to the environment