微电极法测定饮用水中锰离子含量

Determination of manganese ion in drinking water by microelectrode

目的建立一种基于微电极检测饮用水中锰离子含量的方法。方法通过传统集成电路加工工艺完成传感器。在Randle模型基础上,对检测锰离子的微叉指电极工作电路进行等效电路分析,以进行微叉指电极的结构优化。结果优化后叉指电极传感器阻抗降低,低浓度锰离子溶液的区分度提高,检出限低至1 nmol/L,总平均回收率96.6%,相对标准偏差(relative standard deviation,RSD)为5.1%。结论这种叉指电极传感器的检测方法成本低、灵敏度高,不仅可以应用在锰离子的检测当中,还可以应用于其他食品的电化学快速检测。

Objective To establish a method for the determination of manganese in drinking water based on microelectrode.Methods The sensor was fabricated by traditional integrated circuit technology.On the basis of Randle model,the equivalent circuit analysis of the working circuit of the micro interdigital electrode was carried out to optimize the structure of the micro interdigital electrode.Results After optimization,the impedance of interdigital electrode sensor was reduced,the discrimination of low concentration manganese ion solution was improved.The detection limit was as low as 1 nmol/L,the average recovery rate was 96.6%and the relative standard deviation(RSD)was 5.1%.Conclusion This detection method based on interdigital electrode sensor has advantages of low cost and high sensitivity.It can be used not only in the detection of manganese ion,but also in the electrochemical quick detection of other foods.