標準號：ISO 1694-1976
中文標準名稱：天然和人造冰晶石 鐵含量的測定 1,10-菲羅啉光度法
英文標準名稱：Cryolite, natural and artificial; Determination of iron content; 1,10- Phenanthroline photometric method
標準類型：D59
發布日期：1999/12/31 12:00:00
實施日期：1999/12/31 12:00:00
中國標準分類號：D59
國際標準分類號：73.060.40
適用范圍：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.