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阳泉市秋冬季PM2.5水溶性离子污染特征及来源分析

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于2017年10月15日~12月23日采集了阳泉市PM2.5样品,使用离子色谱法分析了样品中水溶性离子组分,并利用相关性分析、正定矩阵因子分析法(PMF)及潜在源贡献因子分析法(PSCF)等方法对PM2.5中水溶性离子组分污染特征及来源进行分析.结果表明,采样期间水溶性离子总质量浓度为(22.41±11.53)μg/m3,占ρ(PM2.5)的34.1%,在污染天气下NH4+、NO3-和SO42-(三者合称SNA)在水溶性离子中的占比为81%,远高于清洁天(62%),而Ca2+、Mg2+、Cl-、K+在污染天气下占比明显下降,污染天气二次无机离子污染较为严重.污染天气下硫氧化速率(SOR)(0.17)和氮氧化速率(NOR)(0.13)明显高于清洁天气SOR(0.11)和NOR(0.06),污染天气二次无机离子转化程度更高.主要污染源对水溶性离子的贡献分别为二次转化(37.4%)、燃烧源(38.2%)及扬尘源(24.4%),其中污染天气下燃烧源和扬尘源对水溶性离子贡献降低,二次转化贡献增加.潜在源区分析表明,SNA主要受到来自东北部和南部地区污染气团短距离传输的影响.
Characteristics of Water-Soluble Ions and Sources of PM2.5 During Autumn and Winter in Yangquan City
Daily samples of atmospheric PM2.5 were collected from October 15,2017 to December 23,2017 in Yangquan city,China.The characteristics and sources of the main water-soluble ions were determined by ion chromatography.The source apportionment of wa-ter-soluble ions in PM2.5 was conducted by using Pearson correlation,Positive Matrix Factorization(PMF)and Potential source contri-bution function(PSCF).The results showed that the total mass concentration of water-soluble ions was 22.41±11.53 μg/m3,ac-counting for 34.1%of PM2.5.The proportion of SO42-、NO3-和NH4+(SNA)in water-soluble ions was 81%in polluted days,which was much higher than that in clean days(62%),while the proportion of Ca2+,Mg2+,Cl-and K+decreased significantly in polluted days,indicating that secondary inorganic pollution was more serious in polluted days.SOR(0.17)and NOR(0.13)in polluted days were significantly higher than that in clean weathers with SOR of 0.11 and NOR of 0.06,and the secondary ion conversion in polluted days was higher.The contributions of major sources to water-soluble ions were secondary transformations(37.4%),combustion sources(38.2%)and dust sources(24.4%),with combustion and dust sources contributing less to water-soluble ions and secondary transfor-mations contributing more under polluted days.The analysis of potential source areas shows that SNA is mainly influenced by short-range transport of polluted air masses from the northeastern and southern regions.

PM2.5water-soluble ionscharacteristicsourceYangquan city

王成、闫雨龙、吴婧、谢凯、彭林

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山西能源学院资源与环境工程系,太原 030600

北京交通大学环境学院智能交通清洁低碳技术教育部工程研究中心,北京 100044

华北电力大学环境科学与工程学院资源环境系统优化教育部重点实验室,北京 102206

PM2.5 水溶性离子 污染特征 来源 阳泉市

山西省基础研究计划大气重污染成因与治理攻关项目

202203021222331DQGG-05-13

2024

地球与环境
中国科学院地球化学研究所

地球与环境

CSTPCD北大核心
影响因子:0.875
ISSN:1672-9250
年,卷(期):2024.52(2)
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