过硫酸铵氧化光度法测定微量锰的褪色机理探讨  

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

作　　者：上官恩波[1,2] 吴呈珂[2] 李晶[2] 冯素玲[2] 李全民[2] Enbo Shangguan;Chengke Wu;Jing Li;Suling Feng;Quanmin Li(School of Chemistry and Chemical Engineering,Henan Normal University,Xinxiang 453003,Henan Province,China;School of Materials Science and Engineering,Henan Normal University,Xinxiang 453003,Henan Province,China)

机构地区：[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

出　　处：《大学化学》2021年第4期212-215,共4页University Chemistry

基　　金：河南师范大学高等教育教学改革与实践(YJS2019JG09)。

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。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.

关 键 词：过硫酸铵 微量锰 褪色机理 高碘酸钾 

分 类 号：G64[文化科学—高等教育学] O657.32[文化科学—教育学]