安阳北部郊区PM<sub>2.5</sub>中水溶性无机离子季节变化、来源特征及其消光贡献

杨志轩; 李岚清; 刘桓嘉; 杨莹; 许梦源; 贾梦珂; 刘恒志

doi:10.13205/j.hjgc.202406009

安阳北部郊区PM_2.5中水溶性无机离子季节变化、来源特征及其消光贡献

doi: 10.13205/j.hjgc.202406009

1. 河南省安阳生态环境监测中心, 河南安阳 455000;
2. 河南师范大学环境学院黄淮水环境污染与防治教育部重点实验室河南省环境污染控制重点实验室, 河南新乡 453007

基金项目:

河南省科技攻关项目(222102320394)

国家自然科学基金项目(42007204)

河南省博士后科研资助项目(HN2022023)

详细信息

作者简介:
杨志轩(1965-),男,本科,高级工程师,主要研究方向为环境监测与分析。ayycyb318@163.com

通讯作者:
刘桓嘉(1987-),男,博士,讲师,主要研究方向为大气颗粒物及其化学组分来源解析及二次气溶胶形成机制。liuhuanjia@htu.edu.cn

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出版历程
- 收稿日期: 2023-07-04
- 网络出版日期: 2024-07-11

SEASONAL VARIATION, SOURCE AND LIGHT EXTINCTION CONTRIBUTION OF WATER-SOLUBLE INORGANIC IONS OF PM_2.5 IN THE NORTHERN SUBURB OF ANYANG, CHINA

1. Anyang Ecology and Environmental Monitoring Center of Henan Province, Anyang 455000, China;
2. Key Laboratory of Yellow River and Huai River Water Environment and Pollution Control, Ministry of Education, Henan Key Laboratory for Environmental Pollution Control, School of Environment, Henan Normal University, Xinxiang 453007, China

摘要

摘要: 为探究安阳市北部郊区PM_2.5中水溶性无机离子(WSIIs)的季节变化、来源特征及其消光贡献,于2018年3月—2019年2月对PM_2.5中化学组分及气态污染物进行在线观测。结果表明:PM_2.5及WSIIs年均浓度分别为(76.68±73.00),(45.60±34.17) μg/m³,且二者均呈冬季浓度最高,夏季最低的趋势。不同季节铵盐的存在形式主要为(NH₄)₂SO₄、NH₄NO₃和NH₄Cl。PMF源解析结果表明,二次硝酸盐、二次硫酸盐、扬尘源及燃烧源是WSIIs的主要来源。同时,基于改进的IMPROVE经验公式计算各组分的消光贡献,其结果显示二次离子组分(SNA)对大气消光的贡献超过67%。不利的气象条件下污染物的排放和积累是造成本地区冬季PM_2.5重污染的重要原因,同时,SNA尤其是SO^2-₄的迅速增加也会导致较高的PM_2.5浓度。因此,控制SNA浓度有利于降低大气PM_2.5浓度,同时也助于大气能见度的提升。
- PM_2.5 /
- 水溶性无机离子 /
- 季节变化 /
- 来源解析 /
- 消光系数
Abstract: Seasonal variation, source characteristics as well as light extinction contribution of water-soluble inorganic ions (WSIIs) in PM_2.5 were explored in the northern suburb of Anyang. Gaseous pollutants, PM_2.5 samples, and their chemical components were online monitored from March 2018 to February 2019. The results showed that the annual average concentrations of PM_2.5 and WSIIs were (76.68±73.00) μg/m³ and (45.60±34.17) μg/m³, respectively, which showed obvious seasonal variation with the maximum values in winter, and the minimum values in summer. NH⁺₄ most likely existed in the form of (NH₄)₂SO₄, NH₄NO₃, and NH₄Cl in four seasons at the observation sites. The main sources of WSIIs were secondary nitrate, secondary sulfate, dust, and combustion source by using positive matrix factorization (PMF). Furthermore, the revised IMPROVE algorithm was used to estimate the extinction coefficient (b_est). The results illustrated that the extinction contribution of SNA could reach 67%. Finally, typical pollution episodes were explored in winter in this study. Continuous emission and accumulation of pollutants under unfavorable metrological conditions was the major cause of the PM_2.5 pollution events at this site. Meanwhile, a rapid increase of SNA, especially SO^2-₄, can lead to higher PM_2.5 concentrations. Hence, the control of SNA is not only conducive to the reduction of regional PM_2.5 concentration, but also to improving atmospheric visibility.
- PM_2.5 /
- water soluble inorganic ions /
- seasonal variation /
- source analysis /
- light extinction coefficient

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