海水重金属电化学传感器检测系统

摘要

A novel electrochemical flow sensing system for determination of heavy metals in seawater has heen described. Processes including on-line filtration, UV digestion, electrochemical enrichment and ion-selective electrode potentiometric detection have been involved in the system for sensitive, selective and rapid detection. For measurements of cadmium, lead and copper in seawater matrix, the linear response ran-ges were 1. 0×10-9-1. 0×10-7, 3. 0×1099-1. 0 ×10-7 and 1. 0×10-9-1. 0× 10-7 mol/L, respectively with the corresponding detection limits of 2. 8×10-10 , 6. 6 ×10-10 and of 5. 1 ×10-10 mol/L. After six measurements, the relative standard deviations were less than 5%. The whole analysis process was completed within 25 min. The system has been applied to the determination of heavy metals in seawater and the results agree with those obtained by stripping voltammetry. The sensor is characterized by simple structure, accuracy and low cost, indicating a great application potential for on-spot analysis of heavy metals in seawater.%研制了一种新型的海水重金属电化学传感器流动分析系统.通过在线过滤、紫外线消解、电化学富集以及离子选择性电极电位测定等过程,实现对海水重金属的高灵敏、高选择性的快速检测.在海水基体条件下,对于镉、铅和铜的测定线性范围分别为1.0×10-9～1.0×10-7 mol/L,3.0×10-9～1.0×10-7 mol/L和1.0×10-9～1.0× 10-7 mol/L,相应检出限为2.8×10-10,6.6×10-10和5.1×10-10 mol/L,连续6次测定的RSD均小于5％,全程分析在25 min内完成.应用于实际海水样品分析,其测定结果与溶出伏安法一致.此传感器性能可靠、成本低廉,在海水重金属现场快速监测方面具有良好的应用前景.