标准摘要
[中文适用范围]： 适用于测定大于0.020%（m/m）的Fe含量（以Fe2O3表示）。 涵盖通过碳酸钠和硼酸的碱熔来溶解测试部分。 用硝酸溶液溶解残余物并用氯化羟铵还原铁(III)。 在 pH 值为 3.5 至 4.2 的缓冲介质中形成铁 (II)-1,10-菲咯啉复合物。 在约 510 nm 的波长下对有色复合物进行光度测量。 [外文原描述]： Applicable to the determination of Fe contents, expressed as Fe2 O3 , of more than 0.020 % (m/m). Covers the dissolution of a test portion by alkaline fusion by means of sodium carbonate and boric acid. Dissolving of the residue with nitric acid solution and reduction of iron(III) by means of hydroxylammonium chloride. Formation of the iron(II)-1,10-phenanthroline complex in a buffered medium at a pH between 3.5 and 4.2. Photometric measurement of the coloured complex at a wavelength of about 510 nm.
英文名称Sodium fluoride primarily used for the production of aluminium — Determination of iron content — 1,10- Phenanthroline photometric method