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为了防止环境污染,不用汞盐测铁,我室试验改进了重铬酸钾容量法和EDTA容量法。以上两法都用了次甲基蓝,前者为氧化还原指示剂,后者为衬托剂且终点稳定、敏锐,能适用于高含量铁矿石中全铁的测定。上两法已用于大批生产,经外检证明,结果完全符合质量要求。 (一)改进后的重铬酸钾容量法 1.分析手续:称样0.2克于银坩埚中加氢氧化钠3克,放入马弗炉中升温至650—700℃熔融15分钟,取出冷却,用热水50—70毫升提取至250毫升烧杯中,加入浓盐酸15毫升,加盖表面
In order to prevent environmental pollution, do not mercury salt test iron, room test to improve the capacity of potassium dichromate and EDTA volumetric method. The above two methods are used methionine blue, the former redox indicator, the latter as a supporting agent and the end point is stable and sensitive, can be applied to the determination of total iron in high iron ore. The two laws have been used in mass production, the inspection certificate, the results fully meet the quality requirements. (A) the improved capacity of potassium dichromate 1. Analysis procedures: Weigh said 0.2 grams silver crucible with sodium hydroxide 3 grams, placed in a muffle furnace heated to 650-700 ° C for 15 minutes to melt, remove the cooling , Extracted with 50-70 ml of hot water to a 250 ml beaker, 15 ml of concentrated hydrochloric acid was added and the surface covered