锰(Ⅱ)-邻菲罗啉络合物的电化学行为及应用
Electrochemical Behavior of Mn(Ⅱ)-Phen Complex and Its Application
摘 要
在pH 9.5的氨水-氯化铵缓冲溶液中,锰(Ⅱ)与邻菲罗啉反应生成组成比为1∶1稳定且电活性的锰(Ⅱ)-邻菲罗啉络合物.采用线性扫描极谱法和循环伏安法研究了锰(Ⅱ)-邻菲罗啉络合物的电化学行为,提出了茶叶中锰含量的测定方法.对测定条件,包括支持电解质、缓冲溶液的浓度、反应介质的酸度、以及增敏剂的选择等,作了试验并予以优化,并探讨了锰(Ⅱ)-邻菲罗啉络合物极谱峰的电化学性质及电极反应机理.在优化的条件下,还原峰峰电流与锰(Ⅱ)浓度在6.3×10-8~8.0×10-7mol·L-1范围内呈线性关系,检出限(3S/N)为2.0×10-8mol·L-1.此法用于茶叶样品分析,加标回收率在97.8%~102.1%之间.
邻菲罗啉
线性扫描极谱法
循环伏安法
Manganese
o-Phenanthroline
Linear sweeping polarography
Cyclic voltammetry
Abstract
A stable and electroactive complex was formed by the reaction of Mn(Ⅱ) with o-phenanthroline (Mn∶Phen=1∶1) in an ammoniacal buffer medium of pH 9.5.Electrochemical behavior of the complex was studied by linear sweeping polarography and cyclic voltammetry,and a method for determination of Mn(Ⅱ) in tea was proposed.Conditions of the reaction medium,including the chioce of supporting electrolyte,concentration and pH of the buffer solution,and the type of sensitizing agent used,were tested and optimized.The electrochemical property of Mn(Ⅱ)-phen complex and mechanism of electrode reaction were studied.Under the optimized conditions,linear relationship between values of reductive peak current and concentration of Mn(Ⅱ) was obtained in the range of 6.3×10-8-8.0×10-7mol·L-1,with detection limit (3S/N) of 2.0×10-8mol·L-1.The proposed method was used in the analysis of tea sample,and the values of recovery found by standard addition method were in the range from 97.8% to 102.1%.
中图分类号 O657.14
所属栏目 工作简报
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收稿日期 2008/1/25
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备注李丽敏(1964-),女,山东高密人,教授,硕士研究生,主要研究方向为极谱分析.
引用该论文: LI Li-min,SUN Kai. Electrochemical Behavior of Mn(Ⅱ)-Phen Complex and Its Application[J]. Physical Testing and Chemical Analysis part B:Chemical Analysis, 2009, 45(4): 398～400
李丽敏,孙凯. 锰(Ⅱ)-邻菲罗啉络合物的电化学行为及应用[J]. 理化检验－化学分册, 2009, 45(4): 398～400
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