Ti/BDD/PbO2复合电极在化学需氧量测定中的应用

以钛基掺硼金刚石为基体,采用电沉积的方法制备了Ti/BDD/PbO2复合电极,并将其用于化学需氧量(COD)的测定。采用扫描电子显微镜(SEM)和X射线衍射谱图(XRD)表征了电极的微观形貌及结构,采用电化学工作站考察了电极对有机物响应特性。实验结果表明,在1.45 V的低电位条件下,线性范围为0.5～175 mg/L,检测限为0.3 mg/L(S/N=3)。采用Ti/BDD/PbO2复合电极测定法和重铬酸钾标准方法对市政污水、食品废水及印染废水的对比结果表明,2种方法的相对误差小于10%,具有良好的一致性。

Application of Ti/BDD/PbO2 composite electrode in chemical oxygen demand determination

A novel composite electrode(Ti/BDD/PbO2) was prepared for chemical oxygen demand(COD) determination by amperometric method.The morphology and crystal structure of as-prepared electrode were characterized by scanning electron microscope(SEM) and X-ray diffraction(XRD).The current signals to organic compounds were analyzed by an electrochemical system.Under the potential of 1.45 V,a linear range of 0.5~175 mg/L and a detection limit of 0.3 mg/L were achieved.The real samples from sewage plant,food and dyeing factories were applied to test the feasibility.The results measured by Ti/BDD/PbO2 electrode agreed well with those determined by the standard dichromate method.