引用本文:程龙,董昊,王含月,朱余.合肥市冬季PM2.5中水溶性离子化学特征分析[J].环境监控与预警,2023,15(4):78-83
CHENG Long,DONG Hao,WANG Hanyue,ZHU Yu.Chemical Characteristics of Water soluble Ions of PM2.5in Winter in Hefei[J].Environmental Monitoring and Forewarning,2023,15(4):78-83
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合肥市冬季PM2.5中水溶性离子化学特征分析
程龙,董昊,王含月,朱余
安徽省生态环境监测中心,安徽 合肥 230071
摘要:
基于2021年12月1日—2022年2月28日合肥市细颗粒物(PM2.5)及其水溶性离子连续观测数据,分析了合肥市冬季PM2.5中水溶性离子化学特征以及不同污染程度下水溶性离子化学特征。结果表明:采样期间合肥市PM2.5污染较重,不同污染程度下PM2.5浓度差异较大,中度及以上污染天的ρ(PM2.5)平均值分别是清洁天和轻度污染天的2.8和1.3倍。二次水溶性无机离子[硝酸根离子(NO3-)、铵根离子(NH4+)和硫酸根离子(SO42-),简称SNA]是合肥市PM2.5的重要组成部分,随着污染程度的加重, PM2.5二次生成比例随之下降。NH4+是合肥市水溶性离子中中和能力最强的离子,易与NO3-和SO42-结合分别形成NH4NO3和(NH42SO4。合肥市SO2和NO2均易发生二次转化,且SO2较NO2更容易发生二次转化。钙离子(Ca2+)和镁离子(Mg2+)相关性较高,说明合肥市PM2.5可能受扬尘影响较大;钾离子(K+)是生物质燃烧的指示离子,氯离子(Cl-)与K+相关性较好,说明合肥市PM2.5组分中的Cl-和K+主要来自生物质燃烧。PM2.5中水溶性离子受降水和温度影响较大。
关键词:  合肥市  离子组分  细颗粒物  硫氧化率  氮氧化率
DOI:10.3969/j.issn.1674-6732.2023.04.013
分类号:X513
基金项目:国家重点研发计划(2018YFC0213800);宿州市细颗粒物与臭氧污染协同防控“一市一策”驻点跟踪研究项目(DQGG202116)
Chemical Characteristics of Water soluble Ions of PM2.5in Winter in Hefei
CHENG Long,DONG Hao,WANG Hanyue,ZHU Yu
Anhui Ecological and Environmental Monitoring Center,Hefei,Anhui 230071,China
Abstract:
This study applied online observations of fine particulate matter(PM2.5) and its water soluble ions in Hefei City from December 1st, 2021 to February 28th, 2022, and analyzed the characteristics of water soluble ions in PM2.5, focusing on its variety in different pollution grades. The results showed that the concentration of PM2.5varied greatly under different pollution levels, the average PM2.5 levels on days with moderate and above pollution were 2.8 and 1.3 times higher than those on clean and light pollution days. SNA(including NO3-, NH4+, and SO42-) were important components of PM2.5, and its proportion in PM2.5 decreased with pollution levels increased. NH4+ possess the strongest neutralizing ability among water soluble ions, which would form NH4NO3 and(NH4)2SO4when combined with NO3- and SO42-, respectively. Both of SO2 and NO2 were prone to secondary transformation, and SO2 was more inclined to this transformation than NO2. Ca2+ and Mg2+ were highly correlated, which indicating that dust may have a great contribution to PM2.5. K+ was trace ion of biomass burning, and Cl- had a good correlation with it, indicating that Cl- and K+ in PM2.5 mainly relate to biomass burning. Otherwise, water soluble ions in PM2.5 were greatly influenced by precipitation and temperature.
Key words:  Hefei  Ionic component  PM2.5  SOR  NOR