高纯度铝中痕量硅的测定,基于在pH1.2左右的微酸性溶液中,正硅酸与钼酸铵形成的黄色硅钼杂多酸,以1-氨基-2萘酚-4磺酸还原生成的硅钼蓝,在4.5N的硫酸介质中,用正戊醇萃取该蓝色产物,借此进行光度测定。方法快速、简单、灵敏度高,结果重现性佳。 The determination of trace silicon in high-purity aluminum is based on the yellow silicomolybdic heteropolyacid formed from orthosilicic acid and ammonium molybdate in a slightly acidic solution with a pH value of about 1.2, with 1-amino-2-naphthol-4-sulfonic acid The resulting molybdenum blue is reduced and the blue product is extracted with n-amyl alcohol in a 4.5 N sulfuric acid medium, whereby the photometric determination is carried out. Method is fast, simple, high sensitivity, good reproducibility.