摘要
分别于2016年、2021年夏、秋季在天津市采集细颗粒物(PM_(2.5))样品,分析PM_(2.5)的质量浓度、水溶性离子组成、水溶性离子相关性,探讨“十三五”前后天津市夏、秋季PM_(2.5)中水溶性离子污染特征,利用主成分分析解析水溶性离子污染来源。结果表明,2021年夏、秋季PM_(2.5)浓度较2016年夏、秋季分别下降了31.9%、58.0%,水溶性离子浓度分别下降了59.8%、72.1%,天津市夏、秋季主要水溶性离子均为SO_(4)^(2-)、NO_(3)^(-)、NH_(4)^(+)。与2016年相比,移动源对PM_(2.5)的贡献更高,但水溶性离子的二次转化程度低于2016年。2016年秋季、2021年夏季NH_(4)^(+)以(NH_(4))_(2)SO_(4)和NH_(4)NO_(3)的形式存在,2021年秋季NH_(4)^(+)以(NH_(4))_(2)SO_(4)、NH_(4)NO_(3)及NH_(4)Cl的形式存在,2016年夏季NH_(4)^(+)除了以(NH_(4))_(2)SO_(4)、NH_(4)NO_(3)及NH_(4)Cl的形式存在之外,还有其他存在形式。主成分分析结果表明,天津市PM_(2.5)中水溶性离子的主要来源主要为二次源、建筑尘。
Fine particulate matter(PM_(2.5))samples were collected in Tianjin in the summer and autumn of 2016 and 2021.The mass concentration,composition and correlation of water-soluble ions were analyzed to explore the characteristics of water-soluble ion pollution in PM_(2.5)in summer and autumn of Tianjin before and after the“13th Five-Year Plan”.The sources of water-soluble ion pollution were analyzed by principal component analysis.The results showed that the PM_(2.5)concentration in summer and autumn of 2021 decreased by 31.9%and 58.0%,and the concentration of water-soluble ions decreased by 59.8%and 72.1%compared with that in summer and autumn of 2016.The main water-soluble ions in summer and autumn of Tianjin were SO_(4)^(2-),NO_(3)^(-)and NH_(4)^(+).Compared with 2016,the contribution of mobile sources to PM_(2.5)was higher,but the degree of secondary conversion of water-soluble ions was lower than that in 2016.In autumn 2016 and summer 2021,NH_(4)^(+)exists in the form of(NH_(4))_(2)SO_(4)and NH_(4)NO_(3).In autumn 2021,NH_(4)^(+)exists in the form of(NH_(4))_(2)SO_(4),NH_(4)NO_(3)and NH_(4)Cl.In summer 2016,NH_(4)^(+)exists in other forms besides(NH_(4))_(2)SO_(4),NH_(4)NO_(3)and NH_(4)Cl.The results of principal component analysis showed that the main sources of water-soluble ions in PM_(2.5)in Tianjin were secondary sources and construction dust.
作者
邹官灿
杨阳
武甫亮
罗希
肖致美
吴建会
ZOU Guancan;YANG Yang;WU Fuliang;LUO Xi;XIAO Zhimei;WU Jianhui(College of Environmental Science and Engineering,Nankai University,State Key Laboratory of Urban Particulate Matter Pollution Control for Environmental Protection,Tianjin 300071;Tianjin Ecological Environment Monitoring Center,Tianjin 300191)
出处
《环境污染与防治》
CAS
CSCD
北大核心
2023年第5期639-644,649,共7页
Environmental Pollution & Control
基金
天津市科技计划项目(No.20JCYBJC01170)。
