提高硅钼黄比色溶液稳定性的研究  

Study of Improving the Stability of Colorimetric Solution of Silicon Molybdenum Yellow

作　　者：沙德仁[1] 

机构地区：[1]南京玻璃纤维研究设计院质检中心,南京210012

出　　处：《玻璃纤维》2010年第4期18-28,41,共12页Fiber Glass

摘　　要：试验、分析和总结了影响β硅钼黄稳定性的显色条件、溶液组成及稳定剂的选用等诸多因素。发现丙酮的稳定效果比乙醇好,且没有光化学还原干扰。试验表明,在pH,0.6～1、钼酸铵含量为0.8%～1.2%、丙酮含量为5%～10%、大体积显色所形成的β硅钼黄在30,℃以下能稳定4,h以上,且重现性好,能较好地满足分析要求。用氟化钾和硼酸进行解聚处理后的试液,若在玻璃容量瓶中显色并放置,氟仍会侵蚀玻璃,引起干扰。研究改进后的硅钼黄法,其准确度和精密度与抗坏血酸还原-硅钼蓝法相似,分析微量二氧化硅S≤0.014%、RSD≤1.5%,但比硅钼蓝法快速、简便、节省试剂。Through tests,the author analyzed and summarized the factors affecting the stability of β type silicon molybdenum yellow,such as developing conditions,solution composition and the selection of stabilizing agent.The tests showed that β silicon molybdenum yellow developed in large volume from a solution of pH 0.6～1 with 0.8%～1.2% ammonium molybdate and 5%～10% acetone could remain stable for more than 4 hours at a temperature lower than 30,℃ and exhibit good reproducibility,thus meeting the requirement of analytical application.The test solution depolymerized with potassium fluoride and boric acid could still produce erosion of glass by fluorine and cause interference when developed and placed in a volumetric flask.The improved silicon molybdenum yellow method was similar to ascorbic acid reduction-silicon molybdenum blue method in accuracy and precision but faster,simpler and more reagent saving than silicon molybdenum blue method.

关 键 词：二氧化硅 硅钼杂多酸 丙酮 稳定性 分光光度法 

分 类 号：TQ171.771.2[化学工程—玻璃工业]