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What are the common applications of nitrogen oxide analyzers?
Date: 2025-09-02Read: 0
Nitrogen oxides (NOx) are one of the atmospheric pollutants, mainly including nitric oxide (NO) and nitrogen dioxide (NO ₂). They mainly come from processes such as motor vehicle emissions and industrial combustion. The excessive emission of nitrogen oxides can have significant impacts on the environment and human health, so effective analysis of it is very important.
Nitrogen oxide analyzerWorking principle:
1. Chemiluminescence method
Chemiluminescence method is one of the commonly used techniques in nitrogen oxide analysis at present. The principle is that nitrogen oxides react chemically with ozone to produce light of a specific wavelength. The analyzer calculates the concentration of NO or NO ₂ in the air by detecting the intensity of light emitted during the reaction. The chemiluminescence method has high sensitivity and accuracy, and is currently the standard measurement method.
2. UV absorption method
The principle of ultraviolet absorption method is that nitrogen oxides absorb specific wavelengths of ultraviolet light. By measuring the absorbance of gas samples under ultraviolet light irradiation, the concentrations of NO and NO ₂ can be calculated. The ultraviolet absorption method is relatively simple and the equipment is relatively cheap, but its sensitivity and selectivity are poor, and it is easily affected by interference from other gases.
3. Electrochemical method
Electrochemical method utilizes nitrogen oxides to generate redox reactions on the electrode surface, resulting in changes in current or voltage. By measuring changes in current or voltage, the concentration of nitrogen oxides can be calculated. The equipment for electrochemical methods is usually compact, suitable for on-site use, and suitable for measuring low concentration gases.
4. Non dispersive infrared method
Non dispersive infrared spectroscopy is based on the absorption characteristics of gas molecules towards infrared light. By analyzing the absorption degree of gases towards specific wavelengths of infrared light, the analyzer can calculate the concentration of nitrogen oxides. This method is commonly used for continuous monitoring and has good stability and reliability.
Application of nitrogen oxide analyzer:
1. Environmental monitoring
With the increasingly serious problem of air pollution, the concentration of nitrogen oxides has become an important indicator for measuring air quality. Widely used in urban air quality monitoring systems to assist environmental protection departments in identifying pollution sources, assessing pollution levels, and developing corresponding control measures.
2. Industrial emission monitoring
Nitrogen oxides in industrial emissions are an important factor causing air pollution. Many industrial enterprises, such as thermal power plants, steel plants, fertilizer plants, etc., need to install analyzers to monitor NOx emissions in exhaust gas to ensure compliance with environmental regulations.
3. Motor vehicle emission testing
With the increase in the number of motor vehicles, motor vehicle emissions have become one of the important sources of nitrogen oxides. Can be used for vehicle emission testing and roadside emission detection, helping traffic management departments control vehicle emissions and improve air quality.
4. Scientific research
It is also widely used in atmospheric science research, especially in the fields of climate change, pollutant migration and transformation. By analyzing the concentration changes of nitrogen oxides, researchers can gain a deeper understanding of chemical processes in the atmosphere, as well as the diffusion and transformation patterns of pollutants.