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高合金钢中硅的化学分析法的自动化,小野昭紘等采用钼兰吸光光度法,分析一个试样需要6分钟。为了加速硅钼杂多酸的形成,文献对高合金钢试样溶液加入碱性钼酸铵溶液以后,采用摇动20～40秒。于沸水浴上加热,也需30秒。但前者低温时再现性稍差,后者对于炉前特快分析手续不便。本文采用加入沸腾的钼酸铵溶液于沸腾的试样溶液中以代替水浴法,可加速反应,使硅钼杂多酸于瞬时形成,随即在草酸存在下以硫酸亚铁铵还原为硅钼杂多兰,仅需90秒钟左右便可完成高合金钢中硅的测定。方法的准确度
The automation of chemical analysis of silicon in high-alloy steels and the use of Molybdenum blue spectrophotometry by Koyasu Shoharu and others required 6 minutes to analyze one sample. In order to accelerate the formation of silicomolybdic heteropolyacid, the literature on the high alloy steel sample solution after adding alkaline ammonium molybdate solution, the use of shaking 20 to 40 seconds. On the boiling water bath, also need 30 seconds. However, the former is slightly less reproducible at low temperatures, which is inconvenient for rapid oven front analysis. In this paper, the addition of boiling ammonium molybdate solution in the boiling sample solution instead of water bath method, can speed up the reaction, the heteropoly-silicate-molybdenum instantaneous formation, and then in the presence of oxalic acid ammonium ferrous sulfate reduction of silico-molybdenum Duolan, only about 90 seconds to complete high-silicon steel in the determination. The accuracy of the method