Seasonal variation of water-soluble inorganic ions and carbonaceous components of PM2.5 and PM1 in industrial and residential areas of Suizhou, China

IF 3.9 3区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

Atmospheric Pollution Research Pub Date : 2024-08-03 DOI:10.1016/j.apr.2024.102276

Mi Zhang , Yu Gong , Hao Huang , Hui Hu

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Abstract

Seasonal variations of fine particulate matter (PM) and its chemical components in Suizhou are investigated by collecting PM_2.5 and PM₁ samples from industrial and residential areas between March 2017 and February 2018. The findings reveal more severe PM pollution in industrial areas compared to residential areas. Concentrations and percentages of water-soluble inorganic ions (WSII) in PM are higher in spring and winter. Notably, the high levels of SO₄²⁻ and NO₃⁻ in PM_1-2.5 indicate that secondary transformation of SO₂ and NO_x significantly contribute to the rapid increase in PM_1-2.5. The conversion of NO₂ to NO₃⁻ is a key factor in the winter increase of mass concentrations of PM_2.5 [ρ(PM_2.5)], while photochemical reactions involving NO₂ drive the summer increase of ρ(PM_2.5). Organic carbon (OC) and elemental carbon (EC) are mainly distributed in PM₁, with OC peaking in winter. Chemical fractionation of PM reveals that carbonaceous components have a greater impact on PM₁ concentration than WSII, whereas WSII more significantly affects ρ(PM_2.5) than carbonaceous components. The OC to EC ratio in industrial areas (2.5 ± 1.4) and residential areas (1.9 ± 0.8) suggests more prominent secondary aerosol pollution in industrial areas. Significant correlations between secondary organic carbon (SOC), SOC conversion rate (η_SOC), and concentrations of O₃-8h and NO₂ in Suizhou further indicate that O₃ and NO₂ levels in the atmosphere influence the generation of SOC and η_SOC.

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随州工业区和居民区 PM2.5 和 PM1 中水溶性无机离子和碳质成分的季节变化

通过采集2017年3月至2018年2月期间随州工业区和居民区的可吸入颗粒物和颗粒物样本，研究了随州细颗粒物及其化学成分的季节性变化。研究结果表明，与居民区相比，工业区的可吸入颗粒物污染更为严重。可吸入颗粒物中水溶性无机离子（WSII）的浓度和百分比在春季和冬季较高。值得注意的是，可吸入颗粒物中二氧化硫和氮氧化物的含量较高，这表明二氧化硫和氮氧化物的二次转化在很大程度上导致了可吸入颗粒物的快速增加。将 NO 转化为 NO 是冬季可吸入颗粒物（PM）质量浓度增加的关键因素，而涉及 NO 的光化学反应则推动了夏季可吸入颗粒物（PM）的增加。有机碳（OC）和元素碳（EC）主要分布在可吸入颗粒物中，有机碳在冬季达到峰值。可吸入颗粒物的化学分馏结果表明，碳质成分对可吸入颗粒物浓度的影响比 WSII 更大，而 WSII 对（可吸入颗粒物）的影响比碳质成分更显著。工业区（2.5 ± 1.4）和居民区（1.9 ± 0.8）的 OC 与 EC 比率表明，工业区的二次气溶胶污染更为突出。随州二次有机碳（SOC）、SOC转化率（）与O-8h和NO浓度之间的显著相关性进一步表明，大气中的O和NO水平影响着SOC和.NOC的生成。

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来源期刊

Atmospheric Pollution Research ENVIRONMENTAL SCIENCES-

CiteScore

8.30

自引率

6.70%

发文量

256

审稿时长

36 days

期刊介绍： Atmospheric Pollution Research (APR) is an international journal designed for the publication of articles on air pollution. Papers should present novel experimental results, theory and modeling of air pollution on local, regional, or global scales. Areas covered are research on inorganic, organic, and persistent organic air pollutants, air quality monitoring, air quality management, atmospheric dispersion and transport, air-surface (soil, water, and vegetation) exchange of pollutants, dry and wet deposition, indoor air quality, exposure assessment, health effects, satellite measurements, natural emissions, atmospheric chemistry, greenhouse gases, and effects on climate change.