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本文以盐酸—过氧化氢溶解试样,并在盐酸介质中,在硫酸铜存在下用硫脲作还原剂的硅钼蓝直接比色法.方法具有试剂用量少、溶样速度快、空白低等优点,文章着重解决了测定微量硅的空白问题:在空白溶液中加入少量铁,就可以和试样溶液同样进行显色,借以测出全空白的吸光度,改进了用反加钼酸铵作空白的方法.操作简便、再现性好、显色溶液能稳定2小时以上.测定下限为0.001%硅,整个操作过程和试剂,均同常量分析.
In this paper, hydrochloric acid-hydrogen peroxide dissolved samples, and in hydrochloric acid medium, in the presence of copper sulfate with thiourea as reductant silicon molybdenum blue direct colorimetric method with less reagent, sample speed, blank Low, the article focuses on solving the problem of measuring the blank silicon: a small amount of iron in the blank solution, and the sample solution can be the same color, in order to measure the full blank absorbance, improved with ammonium antimoaluminate For the blank method. Easy operation, good reproducibility, color solution can be stable for more than 2 hours. Determination of the limit of 0.001% silicon, the entire operation and reagents, both with constant analysis.