中文摘要：

利用电沉积方法制作了镀铂铅笔芯热电极（Pt/HPGE）,用循环伏安法（CV）及扫描电镜（SEM）对其性质进行了表征。此电极具有价廉易得、重现性好及温度响应灵敏等特点。在此电极上研究了核黄素（RF）对Ru（bpy）32＋-C2O42-电致化学发光体系的猝灭作用,并推测了可能的机理,据此建立了灵敏检测RF的新方法。电极温度升高到58℃时,检出限可达1.9×10-10mol/L（S/N=3）,比室温时明显降低。应用于维生素药片中RF含量的测定,平均回收率为102.8%。

英文摘要：

A platinum coated heated pencil graphite electrode（Pt/HPGE） was fabricated and its properties were characterized by cyclic voltammetry（CV） and scanning electron microscopy（SEM）,etc.It was demonstrated that Pt/HPGE had unique properties such as cheapness,easy preparation,good reproducibility and sensitive temperature response.The Pt/HPGE was employed to detect riboflavin（RF） sensitively based on the quenching effect of RF on Ru（bpy）32＋/C2O42-electrochemiluminescence（ECL） system.The limit of detection was 1.9×10-10 mol/L（S/N=3） at an electrode temperature of 58 ℃,which clearly lower than that at room temperature.The method was applied to the determination of RF in vitamin pills with an average recovery of 102.8%.