Nitrite electrochemical sensor and manufacturing method thereof

Abstract

The invention discloses a nitrite electrochemical sensor and a manufacturing method thereof. The nitrite electrochemical sensor is used for detecting the concentration of nitrite in a to-be-detected solution and comprises a substrate, wherein an auxiliary electrode, a working electrode, a reference electrode and leads and binding posts of the various electrodes are printed on the substrate by virtue of a silk-screen printing technology; the auxiliary electrode and the working electrode are subjected to carbon paste printing, while the reference electrode, the leads and the binding posts are subjected to silver/silver chloride paste printing; reduced graphene oxide is also deposited on the surface of the working electrode by virtue of an electrochemical graphene oxide reduction method, and a layer of Nafion is dispensed on the upper surface of the reduced graphene oxide. The sensor disclosed by the invention has the advantages of high sensitivity, short response time, good repeatability, low cost, disposability and the like, and has a good application potential in the aspect of on-site rapid detection of the content of nitrite in a to-be-detected sample.

Description

technical field [0001] The invention belongs to the field of electrochemical technology, in particular to a nitrite electrochemical sensor and a preparation method thereof. Background technique [0002] As an environmental pollutant, nitrite widely exists in nature, especially in surface water and groundwater, as well as in animals, plants and food. When the nitrite content accumulates to a certain concentration, it will have harmful effects on humans and animals. For example, nitrite can oxidize hemoglobin in the human body to methemoglobin, and methemoglobin cannot transport oxygen to the whole body; another example is nitrous acid in aquaculture water. When the salt concentration exceeds 0.1mg / L, it will cause the aquatic animals to reduce their food intake and autoimmunity, and then they will be easily infected with pathogens and outbreaks of diseases. [0003] Therefore, the rapid detection of nitrite is particularly important. Traditional nitrite determination methods...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a nitrite electrochemical sensor and its preparation method to solve the problems of traditional nitrite detection technology such as cumbersome operation, time-consuming and labor-consuming, complicated equipment, and the use of solid electrodes such as glassy carbon electrodes for long-term Disadvantages such as electrode surface poisoning and high cost caused by time measurement

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