Three-electrode system, electrochemical sensor and manufacturing method thereof, and electrochemical workstation and application thereof

Abstract

The invention provides a three-electrode system, an electrochemical sensor and a manufacturing method thereof, and an electrochemical workstation and an application thereof. The three-electrode systemcomprises a working electrode whose surface of a conductive area is printed with a conductive layer, a reference electrode whose the surface of the conductive area is printed with the conductive layer, and a counter electrode whose surface of the conductive area is printed with the conductive layer. The conductive layer is a mixture of carbon paste printing ink and silver paste printing ink. In the three-electrode system, a mixed slurry layer of the carbon paste printing ink and the silver paste printing ink is printed on the surface of the conductive area of three electrodes so that the three-electrode system has good sensitivity and a good sensing effect, and has good responsiveness to current changes. The electrochemical sensor has advantages of high specificity, high sensitivity and good accuracy. The manufacturing method of the electrochemical sensor is simple, a raw material is easy to get, a price is low, the sensor is easy to realize and the sensor is convenient for industriallarge scale application. The electrochemical workstation can be used to detect contents of lead and cadmium ions in food through converting electrical signals into chemical signals.

Description

technical field [0001] The invention belongs to the detection field, and relates to a three-electrode system, an electrochemical sensor and a preparation method thereof, an electrochemical workstation and applications thereof. Background technique [0002] In recent years, the pollution of heavy metals (such as lead and cadmium, etc.) in food is one of the factors of food unsafety, because the human body is difficult to metabolize these heavy metals, resulting in a cumulative effect, and the source of some heavy metals is difficult to predict, resulting in its harmful effects on the human body. more harmful. [0003] The detection of heavy metals in food includes sample processing and heavy metal detection, which is a systematic problem that needs to be solved. The current third-party testing mainly uses microwave digestion and large-scale analytical instruments (such as ICP-MS, etc.). The test results are relatively accurate, but the operation requirements are high, the sa...

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Problems solved by technology

[0004] CN203772795U discloses a kind of electrochemical sensor electrode, and described electrochemical sensor electrode comprises: substrate, and the upper surface of described substrate is provided with contact reaction area and insulating layer area, and this insulating layer area surrounds described contact reaction area; An insulating layer, the thick film insulating layer covers the upper surface of the substrate located in the insulating layer region, so as to form a groove current collecting structure with the substrate located in the contact reaction region; wherein, the substrate located in the contact reaction region The surface of the medium substrate is also provided with a reference electrode, a working electrode and an auxiliary electrode that are not in contact with each other; the detection device can avoid the problem of solution loss and contamination during the detection process, but it does not mention the ability to detect the content of heavy metal ions in food

[0005] CN103424456A discloses a three-electrode electrochemical sensor, including a working electrode, a reference electrode and a counter electrode, all three electrodes are in contact with the liquid electrolyte and form ionic conduction through the electrolyte, and the working electrode consists of Composed of a porous electronic conductor layer, the electronic conductor layer contains active substances, the active substances are selected from one or more combinations of manganese compounds, cobalt compounds or chromium compounds; the electrochemical sensor described in the invention Used to detect toxic gases or amines, but does not mention the quantitative detection of heavy metal ions

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