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近年来,为了测定钢中低含量硅,提出了使用有机溶剂萃取钼硅兰的手段来提高方法的灵敏度。但由于要进行萃取分离和使用有机溶剂,在日常分析中仍以直接分光光度法较为方便。本法使用过硫酸铵作为氧化剂,破坏钢中碳化物,以抗坏血酸还原钼硅杂多酸成钼硅兰,用分光光度法,在波长810毫微米处,测量钢中0.01～0.1％的硅含量
In recent years, in order to determine the low content of silicon in steel, the method of using organic solvent to extract molybdenum silicon blue is proposed to improve the sensitivity of the method. However, due to the extraction and separation and the use of organic solvents, in routine analysis is still more convenient to direct spectrophotometry. This method uses ammonium persulfate as oxidant, destroying the carbides in the steel, reducing molybdosilicate heteropoly acid to molybdosilicate with ascorbic acid, measuring the silicon content of 0.01 to 0.1% at a wavelength of 810 nm using spectrophotometry