光度法快速测定硅铝钡和硅钙钡合金中的硅  

Rapid Determination of Silicon in Si-Al-Ba and Si-Ca-Ba Alloys by Spectrophotometry

作　　者：王慧卿 

机构地区：[1]品质保证部

出　　处：《莱钢科技》2012年第5期56-57,共2页Laigang Science & Technology

摘　　要：取试样硅铝钡或硅钙钡合金于塑料烧杯中，以硝酸、氢氟酸溶解后，使硅生成硅酸，加尿素、硼酸消除氮氧化物和过剩氢氟酸的干扰。在弱酸性溶液中，硅酸与钼酸铵生成黄色的硅钼杂多酸，以草酸破坏磷、砷杂多酸的影响，用硫酸亚铁铵将硅钼黄还原成蓝色的硅钼蓝，测量吸光度。分析结果满意，相对标准偏差为0．103％-0．316％。Si -Al -Ba alloy or Si -Ca -Ba alloy is put into a plastic cup and dissolved by using nitric and hydrofluoric acids, thus, the silicon is generated into the silicic acid. Then, the carbamide and boric acids are added into the solution to eliminate the interference of nitrogen oxides and surplus hydrofluoric acid. In the weak acid solution, the silicic acid reacts with ammonium molybdate and generates a yellow silicon-molybdenum heteropoly acid, then after the influence of phosphorous and arsenic heteropoly acids is damaged by oxalic acid, the molybdenum yellow is reduced to a blue molybdenum blue ferrous sulfate, at last, the absorbance is calculated. The analysis results are satisfactory, tive standard devia/ion is between 0. 103% and 0. 316%. by ammonium and the relative standard deviaiion is between 0. 103% and 0. 316%.

关 键 词：硅钙钡合金 弱酸性溶液 硅钼蓝 光度法 硅 

分 类 号：TF645[冶金工程—钢铁冶金]