Characteristics of the chemical composition and source apportionment of PM2.5 for a one-year period in Wuhan, China

IF 3 4区地球科学 Q2 ENVIRONMENTAL SCIENCES

Journal of Atmospheric Chemistry Pub Date : 2022-03-31 DOI:10.1007/s10874-022-09431-6

Xiaoyu Zhang, Guixiang Ji, Xiaowu Peng, Lingya Kong, Xin Zhao, Rongrong Ying, Wenjun Yin, Tian Xu, Juan Cheng, Lin Wang

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引用次数: 9

Abstract

In this study, 123 PM_2.5 filter samples were collected in Wuhan, Hubei province from December 2014 to November 2015. Water- soluble inorganic ions (WSIIs), elemental carbon (EC), organic carbon (OC) and inorganic elements were measured. Source apportionment and back trajectory was investigated by the positive matrix factorization (PMF) model and the hybrid single particle lagrangian integrated trajectory (HYSPLIT) model, respectively. The annual PM_2.5 concentration was 80.5 ± 38.2 μg/m³, with higher PM_2.5 in winter and lower in summer. WSIIs, OC, EC, as well as elements contributed 46.8%, 14.8%, 6.7% and 8% to PM_2.5 mass concentration, respectively. SO₄²⁻, NO₃⁻ and NH₄⁺ were the dominant components, accounting for 40.2% of PM_2.5 concentrations. S, K, Cl, Ba, Fe, Ca and I were the main inorganic elements, and accounted for 65.2% of the elemental composition. The ratio of NO₃⁻/SO₄²⁻ was 0.86 ± 0.72, indicating that stationary sources play dominant role on PM_2.5 concentration. The ratio of OC/EC was 2.9 ± 1.4, suggesting the existence of secondary organic carbon (SOC). Five sources were identified using PMF model, which included secondary inorganic aerosols (SIA), coal combustion, industry, vehicle emission, fugitive dust. SIA, coal combustion, as well as industry were the dominant contributors to PM_2.5 pollution, accounting for 34.7%, 20.5%, 19.6%, respectively.

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武汉地区1年PM2.5化学成分特征及来源分配

本研究于2014年12月至2015年11月在湖北省武汉市采集了123份PM2.5过滤器样本。测定了水溶性无机离子(WSIIs)、元素碳(EC)、有机碳(OC)和无机元素含量。分别采用正矩阵分解(PMF)模型和混合单粒子拉格朗日积分轨迹(HYSPLIT)模型研究了源解析和反轨迹。PM2.5年浓度为80.5±38.2 μg/m3，呈冬季高夏季低的趋势。WSIIs、OC、EC和元素对PM2.5质量浓度的贡献率分别为46.8%、14.8%、6.7%和8%。SO42−、NO3−和NH4+是主要成分，占PM2.5浓度的40.2%。S、K、Cl、Ba、Fe、Ca和I为主要无机元素，占元素组成的65.2%。NO3−/SO42−的比值为0.86±0.72，表明固定源对PM2.5浓度起主导作用。OC/EC比值为2.9±1.4，表明存在次生有机碳(SOC)。利用PMF模型确定了次生无机气溶胶(SIA)、煤炭燃烧、工业、车辆排放和扬尘等5个污染源。新航、燃煤和工业是PM2.5污染的主要来源，分别占34.7%、20.5%和19.6%。

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来源期刊

Journal of Atmospheric Chemistry 地学-环境科学

CiteScore

4.60

自引率

5.00%

发文量

审稿时长

7.5 months

期刊介绍： The Journal of Atmospheric Chemistry is devoted to the study of the chemistry of the Earth''s atmosphere, the emphasis being laid on the region below about 100 km. The strongly interdisciplinary nature of atmospheric chemistry means that it embraces a great variety of sciences, but the journal concentrates on the following topics: Observational, interpretative and modelling studies of the composition of air and precipitation and the physiochemical processes in the Earth''s atmosphere, excluding air pollution problems of local importance only. The role of the atmosphere in biogeochemical cycles; the chemical interaction of the oceans, land surface and biosphere with the atmosphere. Laboratory studies of the mechanics in homogeneous and heterogeneous transformation processes in the atmosphere. Descriptions of major advances in instrumentation developed for the measurement of atmospheric composition and chemical properties.