摘要
试样以过氧化钠高温熔融 ,再用含有硼酸的酸性水溶液浸出 ,将二氧化硅转化成可溶性硅酸。在一定酸度下 ,硅酸与钼酸铵作用 ,生成可溶性的硅钼杂多酸。用草酸掩蔽磷、砷等 ,用硫酸亚铁铵将硅钼杂多酸还原为硅钼蓝 ,之后进行光度法测定。二氧化硅的质量浓度在 0～ 6 m g/L范围内符合郎伯比耳定律。此方法快速、简便、灵敏度高 ,可不经分离直接测定。
The sample is liquited with Na 2O 2 at high temperature,then leached with acid aqueous solution containing boric acid,SiO 2 in it is conversed to soluble silicic acid.At a certain acidity,the silicic acid reacts chemically with ammonium molybdate to soluble silicon molybdenum heteropolyacid.After being reduced to silicon molybdenum blue with FeSO 4,phosphorus and arsenic is masked with oxalic acid,it can be determined by photometry.SiO 2 concentration consists with Lambert Beer's Law between 0～60 mg/L.The method is rapid,simple and high sensitive.
出处
《湿法冶金》
CAS
2001年第1期41-43,共3页
Hydrometallurgy of China
