引用本文:肖致美,徐虹,李鹏,等.天津市典型区域PM2.5中水溶性离子污染特征[J].环境科学研究,2019,32(8):1324-1332.
XIAO Zhimei,XU Hong,LI Peng,et al.Characterization of Water-Soluble Ions in Typical Regional PM2.5 in Tianjin City[J].Research of Environmental Sciences,2019,32(8):1324-1332.]
【打印本页】   【HTML】   【下载PDF全文】   查看/发表评论  【EndNote】   【RefMan】   【BibTex】
←前一篇|后一篇→ 过刊浏览    高级检索
本文已被:浏览 419次   下载 229 本文二维码信息
码上扫一扫!
分享到: 微信 更多
天津市典型区域PM2.5中水溶性离子污染特征
肖致美1, 徐虹1, 李鹏1, 杨宁1, 邓小文1, 陈魁1, 杨文2
1. 天津市生态环境监测中心, 天津 300191;2. 中国环境科学研究院, 北京 100012
摘要:
为了解天津市不同区域PM2.5中水溶性离子污染特征,于2015年7月、10月及2016年1月、4月,在天津市南开区(简称“市区”)及武清区采集PM2.5样品,结合气象因素、气态污染物研究,分析了样品中水溶性离子污染特征及来源.结果表明:①天津市市区及武清区PM2.5中水溶性离子组分主要为二次离子(SO42-、NO3-、NH4+);不同区域PM2.5中二次离子各季节占比略有不同,市区为夏季(54.0%) > 秋季(42.5%) > 春季(41.3%) > 冬季(40.7%),武清区为夏季(53.0%) > 春季(44.6%) > 秋季(43.4%) > 冬季(33.2%).②冬季市区、武清区PM2.5中水溶性离子组成差异较大,其他季节水溶性离子组成相似; 夏季市区及武清区颗粒物呈酸性,其他季节均呈碱性,冬季武清区颗粒物碱性强于市区.③不同季节市区及武清区PM2.5中SO42-均以(NH42SO4形式存在,NO3-冬季以NH4NO3形式存在,其他季节NO3-主要以NH4NO3和HNO3形式共存;市区Cl-主要以NH4Cl、KCl和NaCl形式存在,武清区Cl-主要以NH4Cl、KCl形式存在.④对市区及武清区来说,均相反应和非均相反应是SO42-重要生成途径,均相反应是生成NO3-的主要途径.研究显示,代表一次排放的机动车源、燃煤源和二次无机粒子混合源对天津市PM2.5中水溶性离子贡献率最高,工业源和扬尘源对市区的影响较大,农业源对武清区的影响较大.
关键词:  PM2.5  水溶性离子  污染特征  来源解析
DOI:10.13198/j.issn.1001-6929.2018.12.11
分类号:X513
基金项目:国家重点研发计划项目(No.2016YFC0208500);国家科技支撑计划项目(No.2014BAC23B00)
Characterization of Water-Soluble Ions in Typical Regional PM2.5 in Tianjin City
XIAO Zhimei1, XU Hong1, LI Peng1, YANG Ning1, DENG Xiaowen1, CHEN Kui1, YANG Wen2
1. Tianjin Eco-Environmental Monitoring Center, Tianjin 300191, China;2. Chinese Research Academy of Environmental Sciences, Beijing 100012, China
Abstract:
PM2.5 samples were collected in the Tianjin City urban area and the Wuqing District in July and October of 2015 and January and April of 2016. The water soluble inorganic ions (WSⅡ) in the samples were analyzed. By combining the meteorological factors and gaseous pollutants, the characteristics and main sources of WSⅡ were researched. The results showed that: (1) The SNA (SO42-, NO3- and NH4+) were the dominant ions in the total WSⅡ. The proportion of SNA in total WSⅡ showed different seasonal variations in different regions: summer (54.0%) > autumn (42.5%) > spring (41.3%) > winter (40.7%) in the urban area, and summer (53.0%) > spring (44.6%) > autumn (43.4%) > winter (33.2%) in the Wuqing District. (2) For two sampling sites, the WSⅡ compositions were obviously different in winter, and were similar in the other seasons. The PM2.5 samples were acidic in summer and were alkaline in the other seasons in two areas. The PM2.5 samples were more alkaline in the Wuqing District than in the urban area. (3) SO42- existed in the form of (NH4)2SO4 in four seasons, NO3- existed in the form of NH4NO3 in winter, and in the other seasons NO3- existed in the form of NH4NO3 and HNO3. Cl- existed in the form of NH4Cl, KCl and NaCl in the urban area, while in the Wuqing District, Cl- existed in the form of NH4Cl and KCl. For the two sampling areas. (4) SO42- were formed mainly through homogeneous and heterogeneous reactions and NO3- were formed through homogeneous reactions. The research identified that the major sources of WSⅡ were vehicles, coal combustion and secondary inorganic particles, in addition, industrial source and dust source were also contributors in urban area, and agricultural source was a contributor in Wuqing District.
Key words:  PM2.5  water soluble inorganic ions  pollution characteristics  source apportionment