Correction method for mass concentration data of atmospheric particulates

Abstract

The invention provides a correction method for mass concentration data of atmospheric particulates. According to the method, an on-line correction model is established according to meteorological data of a reference station and the mass concentration data, measured by the reference station, of the atmospheric particulates, and the correction model is adopted to correct the measured mass concentration data, measured by a non-reference station, of the atmospheric particulates. The correction method improves the accuracy of the mass concentration data of the atmospheric particulates and increases the monitoring efficiency of monitoring stations.

Description

technical field [0001] The invention relates to the field of environmental monitoring, in particular to a method for correcting atmospheric particle mass concentration data monitored by a monitoring station. Background technique [0002] At present, the methods for measuring the mass concentration of atmospheric particulate matter at home and abroad are mainly the off-line filter membrane weighing method, as well as the on-line β-ray method and micro-oscillating balance method. The filter membrane weighing method is to extract a quantitative volume of air at a constant speed, and after the particle size is screened, the particles of the selected particle size in the air are trapped on the filter membrane, and the weight of the filter membrane before and after sampling is weighed with a balance , according to the difference and the sampling volume, calculate the particle mass concentration. The filter membrane weighing method is currently an internationally recognized benchm...

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Problems solved by technology

[0004] The prior art also uses the mass concentration of atmospheric particulate matter calculated from the empirical value of a single particle density, which is to calculate the particle size of a single particle detected by the light-scattering particle sensor to obtain the particle volume, multiply it by the empirical value of the particle density, and obtain the mass of a single particle, according to The mass concentration of particulate matter is calculated based on the number of detected particulate matter and sampling conditions. Moreover, the density of atmospheric particulate matter is not fixed. Due to the influence of many factors, the density of particulate matter varies with different particle sizes, different components, different pollution conditions and meteorological conditions. In addition, atmospheric particles are not spherical with uniform color and regular shape. The particle size measured by light scattering method may have different accuracy under different conditions.

Therefore, it is less accurate to use without considering factors such as seasons, regions, and pollution conditions.

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