钼蓝光度法快速测定铬铁中硅

Rapid determination of sillicon in ferrochrome with molybdenum blue photometric method

将经典的高氯酸脱水重量法测定硅改为钼蓝光度法快速分析硅含量。试样溶解后，在0．1～0．6mol／L的微酸性溶液中，硅酸与钼酸铵作用生成黄色的硅钼酸络离子，然后用硫酸亚铁铵还原剂将生成的的黄色硅钼络离子还原成硅钼蓝，其蓝色的强度与硅含量成一定比例关系，借此可用光度法测定硅的含量。该法操作简便、快速，结果准确，缩短了分析周期，提高工效24倍。

This paper describes the changing of the classical perchloric acid dehydration gravimetric method for determining silicon into the molybdenum blue photometric method to fast determine the content of silicon. After the sample is dissolved, in 0.1 - 0.6mol/L subacid solution, silicic acid and ammonium molybdate react on each other and form yellow silicomolybdic acid complex ion, then ammonium ferrous sulfate reductant is used to reduce the formed yellow silico molybdate complex ion into silicomolybdenum blue, of which the strength of blue is proportional to the content of silicon, based on which the photometric method can be used to determine the content of silicon. This method, easy to operate and rapid in showing accurate results , shortens analytical period and raises work efficiency by 24 times.