Iron and steel -- ICP atomic emission spectrometric method -- Part 4: Determination of niobium content -- Dissolution in phosphoric and sulfuric acids or Dissolution in acids and fusion with potassium disulfate
钢铁ICP原子发射光谱法第4部分:铌含量的测定在磷酸和硫酸中溶解或在酸中溶解并与二硫化钾熔融