PPy/PMo_(12)膜修饰电极用于水体中化学需氧量测定的研究  

Study on the detection of the COD values of the water by using PPy/PMo_(12) film modified electrode

作　　者：张中海[1] 丁红春[1] 柴怡浩[1] 潘振声[1] 金利通[1] 

机构地区：[1]华东师范大学化学系,上海200062

出　　处：《化学传感器》2005年第1期21-27,共7页Chemical Sensors

基　　金：国家自然科学基金(No.20327001)资助课题

摘　　要：该文利用电化学方法制备了聚吡咯掺杂磷钼杂多酸(PPy/PM_(o12))膜修饰电极,该修饰电极对溶液中的 BrO_3^-有很好的电流响应。纳米 TiO_2-KBrO_3,共存体系可以光催化氧化水体中的有机物,体系中的 BrO_3^-浓度变化可用制备的修饰电极进行测定,继而建立了一种利用 PPy/PM_(o12)膜修饰电极测定水体中化学需氧量(COD)的新方法。实验中以葡萄糖为标准物质,研究了测定机理,优化了测定条件。实验结果表明,该方法操作条件温和,能实现快速、准确的测定。COD 值在50.0～500.0mg·L^(-1)浓度范围内,与修饰电极上的电流响应信号值成线性关系,检测限为25.0mg·L^(-1)。将该方法用于实际水样的检测,测定结果与 COD 标准分析法有好的一致性。A new method of detection the chemical oxygen demand (COD) value using a PPy/PMo film modified electrode was described. The PPy/PMo_(12) film modified electrode was prepared with phosphomolybdate (PMo_(12))-doped polypyrrole(PPy) film by chemical syntheses on a glassy carbon electrode.The PPy/PMo_(12) film modified electrode showed high electrocatalytic activity toward the reduction of BrO_3^- and thus could be used as an amperometric sensor for the determination of the BrO_3^-.The photocatalytie and oxidation system,nano TiO_2-KBrO_3 co-existed system could degrade the organic compounds in water.The optimal experimental conditions and the mechanism of the detection were discussed by using glucose as a standard substance.The application range is 50.0～500.0 mg·L^(-1) and the lowest limit of detection is 25.0 mg·L^(-1).

关 键 词：膜修饰电极 BrO3^- 电流响应 标准分析 磷钼杂多酸 线性关系 掺杂 化学需氧量 水体 COD 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]