肾上腺素电氧化过程的快速扫描循环伏安研究

Fast- scan Cyclic Voltammetry Study of Electrooxidation of Adrenaline*

以快速循环伏安法为主要手段，研究了肾上腺素电化学氧化反应机理 .肾上腺素在 1 mol· dm－ 3 H2SO4中的电化学氧化反应，具有扩散控制的基本特征，并伴随着电活性质粒的弱吸附现象 .在快速电势扫描条件下，肾上腺素电氧化过程遵从 EC反应机理 .当肾上腺素浓度低于 1.00× 10－ 3 mol· dm－ 3时，吸附现象的特征趋于显现出来 ;在快速电势扫描速率下，电活性质粒吸附的特征更加明显 .结合表面伏安法分析，估算了肾上腺素电氧化过程的传递系数α =0.264.电化学反应速率常数 ks=31.81 s－ 1.

The mechanism of the electrochemical oxidation of adrenaline was studied using fast-scan cyclic voltammetry as a major means. In 1 mol . dm(-3) H2SO4, the electrooxidation of adrenaline showed the elementary characteristics of diffusion and were companied by the weak adsorption of electroactive species. In the case of fast-scan test, the electrooxidation of adrenaline was considered to obey EC(electron transfer-chemical reaction) mechanism. When the concentration of adrenaline was below 1.00 x 10(-3) mol . dm(-5), the characteristics of adsorption was easily detected. And the characteristics of adsorption became more evident as the concentration of adrenaline was decreased or the potential scan rate was increased. The transfer coefficient a and the rate constant of the electrochemical reaction k(s) were calculated as 0. 264 and 31.81 s(-1) respectively.