Chemical composition, diurnal variation and sources of PM2.5 at two industrial sites of South China

Developmental Biology

Bo Huang³  Ming Liu³  Jiamo Fu²  Guohua Zhang³  Guoying Sheng¹  Zhaofang Ren³  Xinhui Bi¹ 

[1] State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, 510640, P.R. China$$;State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, 510640, P.R. China$$School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, P. R. China$$;State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, 510640, P.R. China$$Graduate University of Chinese Academy of Sciences, Beijing 100049, P. R. China$$

关键词: PM2.5;    chemical composition;    diurnal variation;    e–waste;    source apportionment;   

DOI  :  10.5094/APR.2013.033

学科分类：农业科学（综合）

来源: Dokuz Eylul Universitesi * Department of Environmental Engineering

【 摘 要 】

Diurnal PM_2.5 samples were collected during summer and winter at an industrial complex site (site A) and an electronic waste (e–waste) recycling site (site B) in Qingyuan, South China. The concentration of organic carbon (OC), elemental carbon (EC), water soluble ions (WSI) and elements were investigated for their seasonal and diurnal variations. Organic matter (OM) was the most abundant specie in winter, accounting for 40.2% and 48.8% of PM_2.5 in sites A and B, respectively; while in summer, excluding the elemental portion, WSI was the biggest part, which accounted for 37% and 49.4% of PM_2.5 mass in sites A and B, respectively. Significantly higher concentrations were observed for most of the analyzed chemical species in winter. Average acidity of PM_2.5 at both sites was significantly higher in summer. Diurnal variation with elevated concentrations of PM_2.5 in nighttime samples was found at site B. Secondary inorganic aerosols (NH₄⁺, NO₃⁻ and SO₄²⁻) exhibited clear day–to–night variation. Concentration of SO₄²⁻ was about 15% higher in daytime samples. NH₄⁺ and NO₃⁻ co–varied in winter, but were weakly associated with each other in summer. Sites A and B samples were almost all ammonium–rich in winter, whereas the summer samples were ammonium–poor during the daytime but ammonium–rich in the night. Positive matrix factorization (PMF) model analysis showed that secondary formation, biomass burning, regional industries, coal combustion and dust had significant contribution to PM_2.5. Among them, secondary formation and biomass burning together contributed approximately 50% of PM_2.5 mass at both sites. Additionally e–waste recycling activities resulted in high pollution of Cu at Site B.

【 授权许可】

Unknown   

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