钛铁矿中二氧化硅的硅钼蓝分光光度法测定  

Silicomolybdic Blue Spectrophotometric Determination of Silicon Dioxide in Ilmenites

作　　者：蔡玉曼[1] 许又方[1] 

机构地区：[1]江苏省地质调查研究院,江苏南京210018

出　　处：《岩矿测试》2007年第1期75-77,共3页Rock and Mineral Analysis

摘　　要：用氢氧化钠-过氧化钠混合熔剂分解样品，酸提取后加入亚硫酸钠水浴加热消除过氧化氢和大量钛的干扰，硅钼蓝分光光度法快速测定钛铁矿中二氧化硅的含量。经国家一级标准物质分析验证，结果与标准值相符，相对标准偏差（RSD，n=7）为0．34％～2．24％。The chromatogenic reaction conditions of silicomolybdic blue in spectrophotometric determination of silicon dioxide in ilmenite samples were studied. Sample was decomposed with NaOH-Na202 flux and the melt was digested with acid solution. N%SO3 was then added into the solution and the sample solution was heated in water-bath to eliminate the interferences from H202 and Ti, The method has been applied to the determination of silicon dioxide in National Standard Reference Materials. The results are in agreement with the certified values with the precision of 0.34% - 2.24% RSD （ n = 7）.

关 键 词：硅钼蓝分光光度法 二氧化硅 亚硫酸钠 钛铁矿 

分 类 号：O657.32[理学—分析化学] O613.72[理学—化学]