硅钼蓝分光光度法测定铬铁矿石中的二氧化硅

摘要

研究了铬铁矿石在高铝坩埚中用过氧化钠＋氢氧化钠混合溶剂（2∶1）熔融，然后用硫脲做还原剂，将硅钼黄还原为硅钼蓝，采用分光光度法测定二氧化硅。本方法可以完全的熔解铬铁矿石，且熔融使用高铝坩埚，大幅降低了分析成本，采用标准溶液中加入铬离子从而解决了铬在显色反应中的干扰，准确度高，重现性好，可以测定铬铁矿石中含量为0．1％～10％的二氧化硅。%An innovative way of silicon molybdenum blue spectrotometry was proposed in this paper to de-termine the silicon in chromite .The sample was melted in high alumina crucible by sodium and sodium peroxide to replace expensive platinum crucible.The back ground was eliminated by adding chromium ions into the sample.There was no significant difference between the results of this method and the certified values of the standard samples.The method has good reproducibility and can be used for analyzing Chro-mite containing between 0.1%$10% SiO2 .