摘要
研究了 4 巯基吡啶自组装膜 (SAM)修饰金电极的制备及其电化学性质 ,并用于抗坏血酸 (AA)的测定。在pH 3.0盐酸 邻苯二甲酸氢钾缓冲溶液中 ,AA在SAM修饰金电极上产生一灵敏的氧化峰 ,峰电流与AA浓度在 4 .0× 10 - 6 ～ 1.0× 10 - 3mol L范围内呈良好的线性关系 ,检出限为 2 .7× 10 - 6 mol L ,相关系数为0 9978。该电极对多巴胺 (DA)有排斥作用 ,重现性良好 ,可用于AA的灵敏测定。
The fabrication and electrochemical characteristics of 4-pyridinethiolate self-assembled monolayer modified Au electrode were investigated. The modified electrode was applied to the determination of ascorbic acid (AA). In buffer solution (pH = 3.0), a sensitive oxidation peak was observed at 274mV with 4-pyridinethiolate modified Au electrode. Compared with the oxidation of AA at the bare Au electrode, the modified electrode oxidizes AA at a potential that is 113mV less positive. The current is proportional to the concentration of ascorbic acid in the range of 4.0 x 10(-6) similar to 1.0 x 10(-3) mol/L, the detection limit is 2.7 x 10(-6) mol/L. The modified electrode has a. well-repeatability and can enhance the sensitivity for the determination of ascorbic acid. It has been applied to the determination of ascorbic acid in tablet.
出处
《分析化学》
SCIE
EI
CAS
CSCD
北大核心
2003年第6期686-688,共3页
Chinese Journal of Analytical Chemistry
基金
国家自然科学基金 (No .2 0 2 75 0 3 1)
教育部高校优秀青年教师奖励计划
西北师范大学科技创新工程 (kjcx 0 1)资助项目
