GB/T 6730.8-2016(\u82f1\u6587\u7248)
铁矿石 亚铁含量的测定 重铬酸钾滴定法
JB/T 8063.5-2011
JB/T 8063.5-1996
KS D 1673-5-2023
Iron and steel — ICP atomic emission spectrometric method — Part 5: Determination of niobium content — Dissolution in phosphoric and sulfuric acids or Dissolution in acids and fusion with potassium disulfate