冰醋酸中肾上腺素的现场光谱电化学行为  

Situ Spectroelectrochemical Behavior of Adrenaline in Glacial Acetic Acid

作　　者：郁章玉[1] 秦梅[1] 张为超[2] 翟翠萍[3] 汪汉卿[3] 

机构地区：[1]曲阜师范大学化学系,曲阜273165 [2]徐州师范大学化学系,徐州221116 [3]中国科学院兰州化学物理研究所,兰州730000

出　　处：《分析化学》2005年第1期97-100,共4页Chinese Journal of Analytical Chemistry

基　　金：国家自然科学基金(No. 29673025);山东省自然科学基金(No.Y2000B03)资助项目

摘　　要：采用以石墨为工作电极的长光程薄层光谱电化学池, 用循环伏安法、恒电位光谱法和单电位跃计时吸光度法,研究了肾上腺素(AD)在冰醋酸介质中的电子转移反应。结果表明:AD在冰醋酸介质中电氧化反应产物为肾上腺素醌,还原态和氧化态的扩散系数分别为 3. 98×10-6 cm2 /s和 3. 90×10-6 cm2 /s;电极反应的式量电极电位为 0. 632V(vs.SCE),式量异相电子转移速率常数为 7. 30×10-4cm/s;传递系数为 0. 15。The electrochemical oxidation of adrenaline(AD) in glacial acetic acid medium was studied by cyclic voltammetry, constant potential control spectrum and single potential step chronoabsorptometriy based on a long-optical-path thin-layer electrochemical cell with a plug-in graphite working electrode. The results show that the electrooxidation product of AD is adrenalinequinone in glacial acetic acid. The diffusion coefficients of reduced and oxidized forms in glacial acetic acid medium are 3.98 x 10(-6) cm(2)/s and 3.90 x 10(-6) cm(2)/s, respectively. And the formal electrode potential, formal heterogeneous electron-transfer rate constant, and electrochemical transfer coefficient of the electrode reaction are 0.632 V (vs. SCE) 7.30 X 10(-4) cm/s and 0.15, respectively.

关 键 词：光谱电化学 电子转移反应 工作电极 速率常数 电氧化 循环伏安法 长光程 肾上腺素 吸光度法 冰醋酸 

分 类 号：O657.3[理学—分析化学]