摘要
为探究长三角背景地区PM_(2.5)中水溶性离子的污染特征及来源,于2018年-2019年在临安大气本底站采集PM_(2.5)样品,并分析PM_(2.5)中水溶性离子。结果显示临安区水溶性离子质量浓度平均值为20.4μg/m^(3),占PM_(2.5)的46.2%,呈冬季最高、夏季最低的特征。各离子质量浓度为SO_(4)^(2-)>NO_(3)^(-)>NH_(4)^(+)>Ca^(2+)>Na^(+)>K^(+)>Mg^(2+)>Cl^(-)>F^(-),SNA(SO_(4)^(2-)、NO_(3)^(-)、NH_(4)^(+)三者统称)是水溶性离子的主要成分,占离子总质量的78.5%。阴阳离子电荷平衡分析表明,临安区PM_(2.5)呈碱性。SO_(4)^(2-)、NO_(3)^(-)、NH_(4)^(+)三者之间相关性较高,且NH_(4)^(+)在夏季主要以(NH_(4))_(2)SO_(4)和NH_(4)HSO_(4)形式存在,其他季节主要以(NH_(4))_(2)SO_(4)和NH_(4)NO_(3)形式存在。主成分分析表明,临安区PM_(2.5)中水溶性离子主要来源为二次源、生物质燃烧源、燃煤源和扬尘源。
Toinvestigate the characteristics and sources of water-soluble ions in PM_(2.5)in Yangtze River Delta in China,PM_(2.5)samples were collected from 2018 to 2019,and water-soluble ions in PM_(2.5)were analyzed.The results showed that the averaged concentrations of water-soluble ions were 20.4μg/m^(3),accounting for 46.2%of PM_(2.5).The water-soluble ion concentration was in the order of SO_(4)^(2-)>NO_(3)^(-)>NH_(4)^(+)>Ca^(2+)>Na^(+)>K^(+)>Mg^(2+)>Cl^(-)>F^(-).SNA(SO_(4)^(2-)、NO_(3)^(-)、NH_(4)^(+))were the main ions,accounting for 78.5%of total water-soluble ions.The anion-to-cation ratio showed that PM_(2.5)in Lin'an District was slightly alkaline.SO_(4)^(2-)、NO_(3)^(-)、NH_(4)^(+)showed a high correction and NH_(4)^(+) mainly existed in the form of(NH_(4))_(2)SO_(4) and NH_(4)HSO_(4) in summer,and(NH_(4))_(2)SO_(4) and NH_(4)NO_(3) in other seasons principal component analysis indicated that the major sources of water-soluble ions in PM_(2.5)in Lin'an District were secondary transformation,biomass combustion,coal combustion and dust.
作者
顾涛
陈敏东
Gu Tao;Chen Mindong(Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, Jiangsu Key Laboratoryof Atmospheric Environment Monitoring and Pollution Control, School of Environmental Science and Engineering,Nanjing University of Information Science & Technology, Nanjing 210044, China)
出处
《环境科学与管理》
CAS
2022年第2期37-41,共5页
Environmental Science and Management
基金
国家重点研发计划(2018YFC0213802)
国家自然科学基金(No.21976094,No.21577065)。
