大学化学 >> 2021, Vol. 36 >> Issue (4): 2004125.doi: 10.3866/PKU.DXHX202004125

化学实验 上一篇    下一篇

过硫酸铵氧化光度法测定微量锰的褪色机理探讨

上官恩波1,2, 吴呈珂2,*(), 李晶2, 冯素玲2, 李全民2   

  1. 1 河南师范大学材料科学与工程学院, 河南 新乡 453003
    2 河南师范大学化学化工学院, 河南 新乡 453003
  • 收稿日期:2020-04-30 录用日期:2020-06-28 发布日期:2020-07-21
  • 通讯作者: 吴呈珂 E-mail:ckwu0304@163.com
  • 作者简介:吴呈珂, Email: ckwu0304@163.com
  • 基金资助:
    河南师范大学高等教育教学改革与实践(YJS2019JG09)

Study on the Discoloration Mechanism of Spectrophotometric Determination of Trace Manganese by Ammonium Persulfate Oxidation

Enbo Shangguan1,2, Chengke Wu2,*(), Jing Li2, Suling Feng2, Quanmin Li2   

  1. 1 School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang 453003, Henan Province, China
    2 School of Materials Science and Engineering, Henan Normal University, Xinxiang 453003, Henan Province, China
  • Received:2020-04-30 Accepted:2020-06-28 Published:2020-07-21
  • Contact: Chengke Wu E-mail:ckwu0304@163.com

摘要:

通过实验验证详细讨论了过硫酸铵氧化光度法测定微量锰的褪色机理,结果表明:过硫酸根离子受热分解所产生的过氧化氢导致了MnO4-发生褪色反应,用KIO4代替过硫酸铵作为氧化剂测定微量锰不仅可以避免MnO4-发生褪色现象,还能获得准确测定结果。

关键词: 过硫酸铵, 微量锰, 褪色机理, 高碘酸钾

Abstract:

The discoloration mechanism of spectrophotometric determination of trace manganese by ammonium persulfate oxidation is discussed in detail through experimental verification. The results show that hydrogen peroxide produced by the thermal decomposition of supersulfate ions leads to the discoloration of permanganate ions, using KIO4 instead of ammonium persulfate as oxidant to determine trace manganese can not only avoid the fading phenomenon of MnO4, but also obtain accurate determination results.

Key words: Ammonium persulfate, Trace manganese, Fading mechanism, Potassium periodate

MSC2000: 

  • G64