Aerosol system for measuring concentration of polycyclic aromatic hydrocarbons in atmospheric particulates

Abstract

The invention relates to an aerosol system for measuring a concentration of polycyclic aromatic hydrocarbons in atmospheric particulates. The aerosol system comprises a combustion device for simulating open burning of a biomass, an aerosol smog chamber for simulating an atmospheric pollutant to discharge to an atmosphere, and a particulate mass concentration measuring device, wherein the combustion device, the aerosol smog chamber and the particulate mass concentration measuring device are connected sequentially. The system provided by the invention simultaneously has three functions, and simulates the process of the open burning of the biomass to discharge the atmospheric pollutant accurately and authentically; the physicochemical reaction of the atmospheric pollutant, generated by open burning of crop straw, at each height of a convection layer or even an advection layer is simulated artificially, controllably and repeatedly; meanwhile, the influences of factors such as complex weather and terrain in an actual environment are eliminated; and efficient capture, concentration and concentration test of the polycyclic aromatic hydrocarbons in the atmospheric particulates in an atmospheric environment are simulated via an online monitoring system, so the purposes of accurately collecting, capturing, concentrating and testing the polycyclic aromatic hydrocarbons in the atmosphericparticulates are achieved.

Description

technical field [0001] The invention relates to an aerosol system for measuring the concentration of polycyclic aromatic hydrocarbons in atmospheric particles. Background technique [0002] As a large agricultural country in the world, China ranks first in the world in the possession of crop stalks. According to statistics, more than 20% of the crop stalks are directly burned in the open air. Atmospheric aerosols produced by the open-air burning of crop straws play an important role in the deterioration of environmental quality (such as the formation of smog) and the reduction of visibility, and will participate in atmospheric transport and chemical processes. Their special optical properties and chemical composition affect the surface radiation. It can directly or indirectly affect the climate and gas-liquid circulation as cloud condensation nuclei; in addition, the atmospheric aerosols produced by the open-air burning of crop straws have significant inhalation toxicity, wh...

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Problems solved by technology

In order to simulate the reaction and transmission process of air pollutants produced in the open-air combustion of biomass, it is necessary to provide an environment with low temperature, low pressure, and continuous strong light radiation. However, due to the material and structure of the existing atmospheric aerosol smoke boxes (mostly FEP -Teflon film) limitations cannot be realized. In addition, the existing atmospheric aerosol smog box has a single function and cannot collect and measure polycyclic aromatic hydrocarbon aerosols.

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