Low-cost water body nitrite concentration rapid detection system and method

Abstract

The invention belongs to the technical field of water body nitrite detection, and discloses a low-cost water body nitrite concentration rapid detection system and method.The low-cost water body nitrite concentration rapid detection system is characterized in that a three-electrode potentiostat is connected with an integrated waterproof wire, and the integrated waterproof wire is connected with a delta-shaped electrode cap; the triangular electrode cap is connected with the conductive ends of the working electrode, the reference electrode and the counter electrode; and the middle lower ends of the working electrode, the reference electrode and the counter electrode are sleeved into the clover electrode fixing isolator. The method has the advantages of low prices of components and materials of a detection system, high localization degree, simplicity in preparation, low operation difficulty, short detection time consumption, suitability for various complex environments and the like in the aspect of detection of the nitrite concentration of a water body, and can better make up for the defects of existing nitrite detection equipment and methods; the method has a good application prospect in water quality monitoring and sewage and wastewater treatment engineering.

Description

technical field [0001] The invention belongs to the technical field of nitrite detection in water bodies, and in particular relates to a low-cost rapid detection system and method for nitrite concentration in water bodies. Background technique [0002] Nitrite, which contains nitrite anion (NO 2 - ) of salt. Nitrite is widely found in nature and the human environment and is the most prevalent nitrogen-containing compound. Nitrite is not only a strong carcinogen (in October 2017, it was listed as a Category 2A carcinogen by the International Agency for Research on Cancer of the World Health Organization), a large amount of nitrite entering surface water will lead to serious water eutrophication, so it is necessary to The nitrite concentration in surface water bodies is closely monitored. [0003] In various natural water bodies and sewage treatment projects, there are two main sources of nitrite: 1) Under the action of ammonia oxidizing bacteria, ammonia nitrogen in water...

AI Technical Summary

Problems solved by technology

[0006] (1) It needs to be equipped with an electrochemical workstation that is expensive, has redundant functions, and has a low degree of localization of spare parts, and the cost is high

[0007] (2) The operation of the measurement process is complex, the single detection time is long, and the detection data needs to be processed after a relatively complicated process to obtain the nitrite concentration data, which is difficult to achieve real-time detection

[0008] (3) The existing working electrodes have defects such as high cost, difficult preparation, insufficient localization of raw materials, time-consuming testing process, and poor applicability to complex environments.

However, most of the electrochemical workstations and working electrodes on the market are imported products, which are expensive. Even if some domestic products are available, their prices are only slightly lower than imported products, which cannot significantly reduce the construction of nitrite detection systems. cost

Secondly, the existing detection system has strict requirements on the use environment (only for drinking water, groundwater and other good water bodies), poor applicability, complicated operation, and it is difficult to improve in the short term

Finally, due to the inherent limitations of cyclic voltammetry, it takes at least 5 to 10 minutes for a test. In addition to the later data processing, it will take a longer time to obtain the detection value of nitrite concentration. With the help of more intelligent software for data processing, it is also difficult to compress the single detection time to a few seconds to tens of seconds. Therefore, it is basically impossible to realize real-time detection of nitrite concentration in the true sense

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