ELECTROREFLECTANCE STUDY OF HEMIN ADSORBED ON A PYROLYTIC-GRAPHITE ELECTRODE SURFACE AND ITS COADSORPTION WITH METHYLENE-BLUE

被引:34
作者
SAGARA, T [1 ]
TAKAGI, S [1 ]
NIKI, K [1 ]
机构
[1] YOKOHAMA NATL UNIV,DEPT PHYS CHEM,ELECTROCHEM LAB,TOKIWADAI,HODOGAYA KU,YOKOHAMA,KANAGAWA 240,JAPAN
来源
JOURNAL OF ELECTROANALYTICAL CHEMISTRY | 1993年 / 349卷 / 1-2期
关键词
D O I
10.1016/0022-0728(93)80170-M
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
The electrode reaction of hemin (Hm) adsorbed on an a-b plane pyrolytic graphite (BPG) electrode was investigated by using the potential-modulated UV-visible reflectance method (ER method). It was found that the orientation of the Hm molecule is not flat on the a-b plane of the BPG electrode. Coadsorption of Hm with methylene blue (MB) was also studied. There is no significant interaction between Hm and MB at the BPG electrode. The formal potentials of Hm and MB adsorbed on the BPG electrode are close together and the simultaneous electrode reactions of these dyes give rise to a single voltammetric wave, which is impossible to resolve by traditional voltammetric techniques. The ER method enabled us to resolve these two reactions. A difference was found between the displacement of the adsorbed MB by Hm and the displacement of Hm by MB. It was suggested that the adsorption of one Hm molecule on the MB - preadsorbed BPG electrode requires the displacement of five adjacent MB molecules.
引用
收藏
页码:159 / 171
页数:13
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