Method and device for detecting indoor heavy metal pollution by single particle aerosol mass spectrometry

Abstract

The invention discloses a method and device for detecting indoor heavy metal pollution by single-particle aerosol mass spectrometry. The method is as follows: firstly, a polystyrene ball is used to perform a particle size calibration experiment on the instrument, and then a standard solution of known metal ions is used Carry out the mass number correction experiment. After the calibration is completed, use SPAMS to collect indoor atmospheric aerosols in different areas and heights in real time, and then use SPAMS to analyze and collect various parameters and status information of heavy metal particles in the samples in real time. The SPAMS in the device includes a sequentially connected sampling module, a particle size measurement module, an ionization source module, a mass analyzer module, a data acquisition module and a data analysis module. The invention can quickly, sensitively, accurately and real-time online detect the particle number concentration, particle size distribution, mass spectrum characteristics, mixing state, etc. of indoor heavy metal particles, and judge its possible source.

Description

technical field [0001] The invention relates to the technical field of indoor pollution detection, in particular to a method and a device for real-time monitoring of indoor pollution by single particle aerosol. Background technique [0002] Pollutant monitoring and analysis is the basis of indoor pollution research and an important prerequisite for indoor air quality assessment and symptomatic pollution control. Common toxic heavy metals such as lead, cadmium, zinc, barium, etc., have obvious harm to the human body, and the detection of these elements has very important value. [0003] At present, offline sampling and analysis technology is mostly used for the analysis of heavy metal elements in atmospheric aerosols. However, due to the low content of heavy metal elements in aerosols, it takes a long time to collect enough samples for analysis, and the time resolution of data obtained is low, usually every A mass concentration data is obtained in 24 hours. In addition, due...

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Problems solved by technology

[0003] Currently, off-line sampling and analysis techniques are mostly used for the analysis of heavy metal elements in atmospheric aerosols. However, due to the low content of heavy metal elements in aerosols, it takes a long time to collect enough samples for analysis, and the time resolution of the obtained data is low. 24 hours to get a mass concentration data

Moreover, due to the long sampling time of the offline method, reactions such as volatilization, crystallization, and gas-particle transformation may occur during the collection, storage, and transportation of aerosol samples.

In addition, the detection of heavy metals often requires a pretreatment process, which will cause analysis errors

The rare single particle analysis technology Micro-PIXE Spectrum research is limited to a small amount of particles (<100), so it cannot give good statistical results

And because Micro-PIXE Spectrum is limited by the beam size, it cannot obtain information on submicron particles

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