在烧杯中 ,将冰晶石试样用浓硫酸加热至冒浓烟 ,再加入盐酸使溶液清亮。然后用盐酸羟胺将 Fe3+还原成 Fe2 +。在乙酸盐缓冲介质中 ( p H3.5～ 4 .2 ) ,Fe2 +与邻二氮杂菲形成红色配合物。于波长 51 0 nm下通过测量此配合物的吸光度确定铁的质量分数。方法简便快速 ,适用于人造冰晶石中铁质量分数的测定。 In a beaker, the cryolite sample is heated to concentrated smoke with concentrated sulfuric acid, then add hydrochloric acid to make the solution clear. The hydroxylamine hydrochloride is then used to reduce Fe3 + to Fe2 +. In acetate buffer medium (p H3.5 ~ 4.2), Fe2 + forms a red complex with phenanthroline. The mass fraction of iron was determined by measuring the absorbance of this complex at a wavelength of 510 nm. The method is simple and rapid and is suitable for the determination of iron mass fraction in synthetic cryolite.