岩矿测试2011，Vol.30Issue(2)：226-229,4.
硫氰酸盐比色法测定钨的改进
Improvement of Determination of Tungsten by Thiocyanate Colorimetry
摘要
Abstract
Thiocyanate colorimetric method used in determination of tungsten is based on the fact that W5+ reacts with thiocyanate and forms a yellow complex. In order to reduce tungsten to W completely, titanium trichloride or stannous chloride were generally used as reducing agents. In application, when adding more reducing reagents, Ti + purple color masks yellow color from the complex, and when adding less reducing reagents, red ferric rhodanide affects determination. Through plenty of experiments, titanium trichloride and stannous chloride were choosed as dual reducing agents. The stable complex can be obtained by controlling acidity, temperature and reaction time and the stability of the analytical results can be remarkably improved. The method has been tested by the determination of tungsten in national standard reference materials and the results are in good agreement with certified values. The improved method is suitable for routine analysis of trace tungsten in geological samples.关键词
氯化亚锡/三氯化钛/比色法/钨/还原剂Key words
titanium trichloride/ stannous chloride/ colorimetric method/ tungsten/ reducing agent分类
化学化工引用本文复制引用
杭健,高若柳..硫氰酸盐比色法测定钨的改进[J].岩矿测试,2011,30(2):226-229,4.基金项目
内蒙古自治区地质勘查基金资助(05-6-KC3) （05-6-KC3）
