Heavy-metal electrochemical sensor and manufacturing method thereof

Abstract

The invention discloses a heavy-metal electrochemical sensor and a manufacturing method thereof. The heavy-metal electrochemical sensor comprises a flat-plate conductor layer, a polymer conducting film and an adhesive tape layer, wherein the polymer conducting film is pasted on the flat-plate conductor layer, and the adhesive tape layer is pasted on the polymer conducting film. The heavy-metal electrochemical sensor also comprises a solid counter electrode, a solid reference electrode, an insulating positioning piece and a filter paper piece. The adhesive tape layer completely covers the polymer conducting film, and a round hole with the diameter being 3-5mm is formed in the adhesive tape layer. The solid counter electrode and the solid reference electrode are fixedly arranged on the adhesive tape layer through the insulating positioning piece and are in the edge position of the round hole. The surface of the polymer conducting film area at the round hole is plated with a layer of bismuth film, and the filter paper piece with the diameter being 5-7mm is pasted on the bismuth film. The diameter of the filter paper piece is 1-2mm larger than the diameter of the round hole. The electrochemical sensor is disposable and is specially used for heavy metal detection. The electrochemical sensor can detect various kinds of heavy metal ions alone or at the same time, the detection noise is lowered, and the detection sensitivity is improved.

Description

technical field [0001] The invention belongs to the field of heavy metal electrochemical detection, in particular to an electrochemical sensor for heavy metal detection. Background technique [0002] Heavy metals generally refer to metals with a specific gravity greater than 5, and most of them, such as mercury, lead, and cadmium, are not necessary for human life activities. If the heavy metal content in the human body exceeds the standard, it will easily cause chronic poisoning, reduce the immune function of the human body, induce cancer, and even damage the central nervous system of the human body, causing great harm to human health. All countries in the world have strict limits on the content of heavy metals in products. In the field of environmental protection, heavy metals are also one of the most concerned substances, so there is a great demand for heavy metal detection in related industries. At present, conventional heavy metal detection methods include atomic absor...

AI Technical Summary

Problems solved by technology

However, there are still some unsolved problems in the research of heavy metal electrochemical detection systems, which restrict the application and popularization of electrochemical detection.

There are two main points: 1) The electrode (electrochemical sensor) requires a complex and cumbersome pretreatment process, and the reproducibility is poor; 2) The traditional electrolytic cell is large in volume, and generally requires at least a few milliliters of solution to perform electrolysis. Chemical detection, which affects the portability of the entire electrochemical detection system

[0003] In the early stage, we applied for the invention patent "flat-plate working electrode and its manufacturing method", the application number is 2012104013181. This patent application provides a flat-plate working electrode and its manufacturing method, which mainly solves the complicated pretreatment process of electrochemical sensors. , the problem of poor reproducibility

However, the flat-plate working electrode provided by the above patent can be used for various electrochemical detections, and the range of application objects is very open. Therefore, when used for heavy metal detection, the sensitivity is low and the range of heavy metals that can be detected is small.

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