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- Title
Seasonal Distribution and Source Apportionment of Chemical Compositions in PM 2.5 in Nanchang, Inland Area of East China.
- Authors
Huang, Hong; Yin, Xin; Tang, Yuan; Zou, Changwei; Li, Jianlong; Yu, Chenglong; Zhu, Fangxu
- Abstract
PM2.5 was sampled in four seasons of 2021 in Nanchang. Organic carbon (OC), elemental carbon (EC), and water-soluble ions were the main chemical compositions in PM2.5. The annual average of OC/PM2.5 and EC/PM2.5 was 17.1% and 2.1%, respectively, while nine water-soluble ions were 56.7%. The order of each ion percentage in PM2.5 was NO3− > SO42− > K+ > Na+ > NH4+ > Cl− > NO2− > Ca2+ > Mg2+. The OC/EC (6.54, 13.17, 8.95, 7.99) and Char-EC/Soot-EC (0.88, 0.64, 1.32, 3.74) indicated that the carbon aerosols mainly originated from coal combustion, biomass combustion, and motor-vehicle emissions. High concentrations of Cl− and Ca2+ in spring were associated with dust sources. A good correlation between Na+, SO42−, and NO3− suggests the formation of Na2SO4 and NaNO3. The results of PM2.5 source apportionment by positive matrix factorisation (PMF) showed five main sources: motor-vehicle sources (18–33%), secondary sources (16–36%), coal combustion sources (16–30%), biomass-combustion sources (10–28%), and dust sources (5–7%). Backward trajectory clustering analysis showed PM2.5 in spring and autumn were more influenced by medium distance and local air but mainly influenced by local sources in winter.
- Subjects
NANCHANG (China); CHINA; BIOMASS burning; COAL combustion; SPRING; POLLUTION source apportionment; CARBONACEOUS aerosols; AUTUMN; SEASONS; CLUSTER analysis (Statistics)
- Publication
Atmosphere, 2023, Vol 14, Issue 7, p1172
- ISSN
2073-4433
- Publication type
Article
- DOI
10.3390/atmos14071172