硅钼蓝光度法测定铁精粉中二氧化硅的问题探讨及方法改进  

Problem Discussion and Method Improvement about Determination of Silicon Dioxide Content in Iron Fine by Molybdenum Blue Photometric Method

作　　者：刘娟 

机构地区：[1]辽宁省有色地质局一O一队,辽宁抚顺113015

出　　处：《当代化工》2013年第5期709-710,共2页Contemporary Chemical Industry

摘　　要：采用氢氧化钾和过氧化钠混合熔剂对铁精粉进行熔融,在硫酸介质中,加入草酸消除三价铁的干扰,硫酸亚铁铵将硅钼黄还原为硅钼蓝,比色法测定。此方法检出限低,灵敏度高,且方法简便、快速、准确。此方法检出限为0.004 9%,相对标准偏差0.62%～3.26%Abstract： Iron refined powder was melted by using the mixed flux Of potassium hydrate （KOH） and sodium peroxide （Na2O2）. Oxalic acid was added to eliminate the interference of Fe^3＋ in sulfiu＇ic acid. Silicomolybdic yellow was reduced to silicomolybdic blue by ferrous ammonium sulfate （（NHa）2Fe（SO4）2）, and then it was determined by colorimetric analysis. This method is simple, rapid, and accurate. The detection limit of this method is 0.0049 %, and RSD is in the range of 0.62 %- 3.26%.

关 键 词：硅钼蓝 光度法 铁精粉 二氧化硅 

分 类 号：O657[理学—分析化学]