前言在用 EDTA 滴定球墨铸铁中镁的方法中,主量元素铁的分离系用硫化氢;汞阴极电解;有机溶剂萃取;氧化锌沉淀及色层分离等方法。硫化氢分离后的测定结果再现性不好。有机溶剂萃取铁后,尚须用铜试剂,铜铁试剂分离锰等干扰元素,或者用 EDTA 滴定镁、锰总量,然后 Preface In EDTA titration of magnesium in nodular cast iron, the main element of iron separation with hydrogen sulfide; mercury cathodic electrolysis; organic solvent extraction; zinc oxide precipitation and chromatography separation methods. Hydrogen sulfide separation of the measurement results reproducibility is not good. After the organic solvent extraction of iron, still need to use copper reagents, copper and iron reagents, such as the separation of manganese interference elements, or EDTA titration of magnesium, manganese total, and then