期刊论文

中文

理化检验-化学分册

1001-4020

2005

41

9

644-647

10.3321/j.issn:1001-4020.2005.09.007

本校为其他机构

制备了巯基乙酸自组装金电极，利用循环伏安，SEM，ATR—FTIR对自组装电极进行了表征。研究了电极上多巴胺的电化学反应。结果发现，在pH4．5的0．5mol．L^-1 HOAc-NaOAc缓冲溶液中，电极对多巴胺具有电催化作用。多巴胺在电极上具有准可逆响应，氧化还原峰电位差△Ep=50mV，其催化电流受扩散控制。并计算出表面电极反应的速率常数为7．99×10^-4cm·s^-1。初步探讨了电极的电催化机理，并优化了电催化反应条件。发现在此体系中25倍抗坏血酸存在下不影响多巴胺的测定。该方法用于针剂及尿液中多巴胺含量的测定，测得相对标准偏差（n=6）为5．3％，用标准加入法测得回收率在95．5％～99．7％之间...

A mercaptoacetic acid self-assembled monolayer gold electrode （abbreviated as MA/Au SAE） was prepared, and characterized by cyclic voltammetry, ATR-FTIR and SEM. The electrochemical reaction of dopamine at this electrode was studied. It was found that in an acetate buffer of pH 4. 5, dopamine was electrocatalyzed at MA/Au SAE, and a quasi-reversible response was given, having its potential difference of redox peaks ΔEp = 50 mV. The catalytic current was controlled by diffusion. The constant of reaction rate at the electrode surface was found...