In the present of oxidant, the sample reacted colorimetric reaction adding chromogenic agent in alkaline medium, and the nickel in iron was directly determined with high precision and accuracy.

• 试样经酸分解后,经高氯酸发烟,在有氧化剂存在的碱性介质中,加入显色剂直接比色,从而测定出钢中镍的含量。