该方法基于通过与四硼酸钠熔融并用稀硝酸处理来分解试样，添加钼酸铵以将硅酸盐转化为钼硅酸盐络合物，用抗坏血酸还原为钼蓝，并在约600 nm波长下分光光度法测量钼蓝络合物的吸光度。适用于天然铁矿石、铁精矿和烧结矿（包括烧结矿产品）中的硅含量在0.1%至5.0%之间，尤其适用于含氟矿石。

The method is based on decomposition of the test portion by fusion with sodium tetraborate and treatment with dilute nitric acid, addition of ammonium molybdate to convert silicate into a molybdatosilicate complex, reduction to molybdenum blue with ascorbic acid, and spectrophotometric measurement of the absorbance of the molybdenum blue complex at a wavelength of approximately 600 nm. Applies to silicon contents between 0,1 % and 5,0 % in natural iron ores, iron ore concentrates and agglomerates, including sinter products, especially for ores containing fluorine.