University Chemistry ›› 2021, Vol. 36 ›› Issue (4): 2004125.doi: 10.3866/PKU.DXHX202004125

• Chemistry Laboratory • Previous Articles     Next Articles

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

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