ISO 1694-1976 天然和人造冰晶石 铁含量的测定 1,10-菲罗啉光度法

标准号：ISO 1694-1976
中文标准名称：天然和人造冰晶石 铁含量的测定 1,10-菲罗啉光度法
英文标准名称：Cryolite, natural and artificial; Determination of iron content; 1,10- Phenanthroline photometric method
标准类型：D59
发布日期：1999/12/31 12:00:00
实施日期：1999/12/31 12:00:00
中国标准分类号：D59
国际标准分类号：73.060.40
适用范围：Applies for the determination of natural and synthetic materials having a molar ratio sodium fluoride/aluminium trifluoride between 3 and 1,7 approximately. The method is applicable to products having an iron content equal to or greater than 0,020 % (m/m). The principle consists in dissolution of a test portion by either alkaline or acid fusion. Reduction of iron(III) with hydroxylammonium chloride, formation of the complex iron(II)-1, 10-phenathroline in a buffered medium at pH value between 3,5 and 4,2. Photometric measurement of the coloured complex at a wavelength of about 510 nm. Applies ISO Recommendation R 1694-1970.