Chemical Composition and Source Apportionment of PM2.5 in Urban Areas of Xiangtan, Central South China

International Journal of Environmental Research and Public Health

Lizhi He¹  Zongbo Shi²  Tuan Vu²  Zhe Tian²  Xiaoyao Ma³  Zhenghui Xiao³  Jisong Liu³  Yunjiang Cao³ 

[1] Atmospheric Environment Monitoring Station of Xiangtan, Xiangtan 411100, China;School of Geography, Earth and Environmental Sciences, University of Birmingham, Birmingham B15 2TT, UK;School of Resource, Environment and Safety Engineering, Hunan University of Science and Technology, Xiangtan 411201, China;

关键词: PM_2.5;    chemical components;    source apportionment;    positive matrix factorization (PMF);    Xiangtan City;   

DOI  :  10.3390/ijerph16040539

来源: DOAJ

【 摘 要 】

Xiangtan, South China, is characterized by year-round high relative humidity and very low wind speeds. To assess levels of PM_2.5, daily samples were collected from 2016 to 2017 at two urban sites. The mass concentrations of PM_2.5 were in the range of 30⁻217 µg/m³, with the highest concentrations in winter and the lowest in spring. Major water-soluble ions (WSIIs) and total carbon (TC) accounted for 58⁻59% and 21⁻24% of the PM_2.5 mass, respectively. Secondary inorganic ions (SO₄²⁻, NO₃⁻, and NH₄⁺) dominated the WSIIs and accounted for 73% and 74% at the two sites. The concentrations of K, Fe, Al, Sb, Ca, Zn, Mg, Pb, Ba, As, and Mn in the PM_2.5 at the two sites were higher than 40 ng/m³, and decreased in the order of winter > autumn > spring. Enrichment factor analysis indicates that Co, Cu, Zn, As, Se, Cd, Sb, Tl, and Pb mainly originates from anthropogenic sources. Source apportionment analysis showed that secondary inorganic aerosols, vehicle exhaust, coal combustion and secondary aerosols, fugitive dust, industrial emissions, steel industry are the major sources of PM_2.5, contributing 25⁻27%, 21⁻22%, 19⁻21%, 16⁻18%, 6⁻9%, and 8⁻9% to PM_2.5 mass.

【 授权许可】

Unknown