Influencing Aerosol pH and Source Contribution in Urban and Suburban Areas of Xi'an City

WANG Yanan; YANG Shuqi; WU Jialin; YANG Xu; YANG Fan; WANG Zhao; HE Chi; LIU Fobang

doi:10.7652/xjtuxb202512005

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Influencing Aerosol pH and Source Contribution in Urban and Suburban Areas of Xi'an City

Special Topic Pollution Control and Resource Utilization in the“Dual Carbon”Context | 更新时间：2025-12-08

- Influencing Aerosol pH and Source Contribution in Urban and Suburban Areas of Xi'an City
- Journal of Xi'an Jiaotong University Vol. 59, Issue 12, Pages: 58-68(2025)
- 作者机构：
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb202512005
  CLC： X513
- Received：30 May 2025，
  
  Published：10 December 2025
- 稿件说明：
移动端阅览
WANG Yanan, YANG Shuqi, WU Jialin, et al. Influencing Aerosol pH and Source Contribution in Urban and Suburban Areas of Xi'an City[J]. Journal of Xi'an Jiaotong University, 2025, 59(12): 58-68.
DOI：

WANG Yanan, YANG Shuqi, WU Jialin, et al. Influencing Aerosol pH and Source Contribution in Urban and Suburban Areas of Xi'an City[J]. Journal of Xi'an Jiaotong University, 2025, 59(12): 58-68. DOI： 10.7652/xjtuxb202512005.

摘要

为阐明气溶胶pH的关键影响因素及其污染源贡献，基于2023年西安市城郊PM

2.5

样品水溶性离子和元素分析，结合ISORROPIA Ⅱ热力学平衡模型、正定矩阵因子分解模型与多元线性回归分析，系统评估了西安市城郊气溶胶pH水平及时空变化特征，分析了PM

2.5

化学组分和气象参数对pH的影响，量化了不同污染来源贡献对气溶胶pH的影响。研究结果表明：西安市城郊PM

2.5

整体呈弱酸性，城区和郊区气溶胶pH分别为5.1±1.7、5.2±1.7，受区域和季节影响显著，PM

2.5

中二次无机离子对pH具有显著贡献；影响pH变化的关键驱动因子是TNO

、SO

4、TNH

和Ca

，且pH变化量对SO

4比TNO

更为敏感。多元线性回归分析显示：生物质燃烧和二次硝酸盐在城郊均表现出显著酸化作用，且生物质燃烧源在城区影响更强，二次硝酸盐在郊区影响更强；交通排放源在城区缓解了气溶胶酸性的增强，这可能与NH

的中和作用有关，而二次硫酸盐在郊区对酸性的强化作用可能是由于其生成对污染传输和多相氧化作用更为敏感。

Abstract

To elucidate the key factors influencing aerosol pH and pollution source contributions

levels and spatiotemporal variations of aerosol pH in urban and suburban areas of Xi'an were systematically evaluated

effects of chemical particles comprising PM

2.5

and meteorological parameters on pH were analyzed

and contributions of different pollution sources to the aerosol pH was quantified in this study based on water-soluble ion and element analysis of PM

2.5

samples collected from urban and suburban areas of Xi'an in 2023

in combination with the ISORROPIAⅡthermodynamic equilibrium model

the positive matrix factorization model

and multiple linear regression analysis.The research results show that PM

2.5

in the urban and suburban areas of Xi'an was generally weak acidic：The aerosol pH in urban and suburban areas was 5.1 ± 1.7 and 5.2 ±1.7 respectively

subject to significant variations in different areas and seasons；a notable contribution of secondary inorganic ions in PM

2.5

to the aerosol acidity was observed；the key driving factors affecting pH were TNO

TNH

and Ca

with ΔpH being more sensitive to SO

4 than to TNO

.Multiple linear regression analysis indicated that biomass burning and secondary nitrate had significant acidifying effects in both urban and suburban areas.Biomass burning had a stronger effect in urban areas

while secondary nitrate had a more pronounced effect in suburban areas.Traffic emissions appeared to have mitigated aerosol acidity in urban areas

possibly due to the neutralizing effect of NH

.The enhanced acidifying effect of secondary sulfate in suburban areas might be attributed to its higher sensitivity to pollution transport and multiphase oxidation processes.

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references

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