Mobile surveillance car-based single particle aerosol online mass spectrum detection method

Abstract

The present invention discloses a mobile surveillance car-based single particle aerosol online mass spectrum detection method, which is based on a particle online mass spectrum detection system, the system includes a single particle aerosol online mass spectrometer and a mobile surveillance car, the single particle aerosol online mass spectrometer is arranged on the mobile surveillance car, pollution source particles can be directly detected on line by car- mounted single particle aerosol online flight time mass spectrum to obtain particle number concentration, particle diameter spectrum and particulate online mass spectrometry data; by use of ART-2a approach, particle components are classified to obtain single particle chemical composition data under different time resolution and different particle diameters; mass spectrometry direct analytical technique is used for analysis of particle sources for determination of the particle sources. Single particle diameter and chemical composition information can be detected simultaneously, a sample can be directly and quickly detected without sample preprocessing, high throughput sample analysis can be achieved, and source analysis can be achieved.

Description

technical field [0001] The invention relates to the field of single particle mass spectrometry detection, in particular to an on-line mass spectrometry detection method of single particle aerosol based on a mobile monitoring vehicle. Background technique [0002] At present, the situation of smog occurrence in my country is quite serious, and many large, medium and small cities have smog phenomenon. Haze weather is a serious disastrous weather phenomenon. A large number of fine particles and gas pollutants reduce atmospheric visibility and affect urban air quality through the absorption, scattering or reflection of sunlight, resulting in weakened solar radiation intensity and reduced sunshine hours. cause a reduction in agricultural production. At the same time, it can also enter the human body, causing respiratory diseases, and then causing harm to human health. Research on the chemical characteristics of aerosol particles during haze has also attracted more and more atte...

AI Technical Summary

Problems solved by technology

The off-line method can obtain the chemical composition of aerosol PM2.5, but the pretreatment process is cumbersome and time-consuming. It takes about 1 hour to analyze a single sample, and the particle size and chemical information of a single particle cannot be measured at the same time. Time variation of sol PM2.5 at higher time resolution (such as several minutes)

The online ATOFMS method does not require sample pretreatment, and the analysis speed is fast, but it cannot realize real-time online monitoring and source apportionment

[0004] In summary, due to the limitation of online and offline methods, it is difficult to simultaneously measure the particle size and chemical composition information of individual particles online in real time, as well as source analysis, which limits the research on its generation mechanism and related control technologies.

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