In this paper, the URG's multi-channel sampler and the Aerosol Chemical Speciation Monitor (ACSM) are used for off-line sampling and online monitoring, focusing on the chemical components of atmospheric submicron particles (PM1) in Beijing in October 2016. It is shown that the average concentration of PM1 in Beijing during the whole observation periods is 66.04 ±51.45 μg/m3 and the mass concentration of PM1 in heavy haze (103.16~160.23 μg/m3) is 27.29~45.78 times of that in clean days (3.50~3.78 μg/m3). Significant differences are observed of the chemical components between heavy haze days and clean days in autumn in Beijing. The organic materials are the main chemical components of PM1, contributing up to 64.90% during the clean days. While the secondary inorganic components increase significantly, reaching as high as 69.72% during the heavy haze days. The diurnal variation of sulfate is relatively small, reflecting the regional characteristics; while other components (organic matter, nitrate, ammonium and chloride) see significant diurnal variations. Overally, the composition of PM1 is affected by sources of pollution, atmospheric chemical reactions and the weather conditions.
ZHANG Hanyu
,
CHENG Shuiyuan
. Study on the concentration of submicron fine particles and its chemical constituents in autumn in Beijing[J]. Science & Technology Review, 2018
, 36(2)
: 47
-54
.
DOI: 10.3981/j.issn.1000-7857.2018.02.005
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