| 苏州市PM2.5中水溶性离子的季节变化及来源分析 |
| 摘要点击 3735 全文点击 1097 投稿时间：2016-05-13 修订日期：2016-07-28 |
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| 中文关键词 水溶性离子 PM2.5 苏州 季节变化 来源 |
| 英文关键词 water-soluble ions PM2.5 Suzhou seasonal variation source |
| 作者 | 单位 | E-mail | | 王念飞 | 西南大学资源环境学院, 重庆 400715
中国科学院重庆绿色智能技术研究院, 水库水环境重点实验室, 重庆 400714 | wangnianfei55@163.com | | 陈阳 | 中国科学院重庆绿色智能技术研究院, 水库水环境重点实验室, 重庆 400714 | | | 郝庆菊 | 西南大学资源环境学院, 重庆 400715 | | | 王欢博 | 中国科学院重庆绿色智能技术研究院, 水库水环境重点实验室, 重庆 400714 | | | 杨复沫 | 中国科学院重庆绿色智能技术研究院, 水库水环境重点实验室, 重庆 400714
中国科学院城市大气环境研究卓越创新中心, 中国科学院城市环境研究所, 厦门 361021 | fmyang@cigit.ac.cn | | 赵晴 | 清华大学环境学院, 北京 100084 | | | 薄宇 | 清华大学环境学院, 北京 100084 | | | 贺克斌 | 清华大学环境学院, 北京 100084 | | | 姚玉刚 | 苏州市环境监测中心, 苏州 215004 | |
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| 中文摘要 |
| 2015年在苏州市城区采集大气细颗粒物PM2.5样品共 87套，用重量法分析了PM2.5的质量浓度，离子色谱法分析了颗粒物中F-、Cl-、NO3-、SO42-、Na+、NH4+、K+、Mg2+和 Ca2+，共9种水溶性无机离子. 观测期间，苏州市PM2.5的年均质量浓度为（74.26±38.01）μg·m-3，其季节特征为冬季 > 春季 > 秋季 > 夏季；9种水溶性离子的总质量浓度为（43.95±23.60）μg·m-3，各离子的浓度高低顺序为 NO3- > SO42- > NH4+ > Na+ > Cl- > K+ > Ca2+ > F- > Mg2+；SNA（SO42-、NO3-和 NH4+三者的简称）是最主要的水溶性离子；SO42-、NO3-和 NH4+三者之间具有显著的相关性，它们在PM2.5中主要是以 NH4NO3和（NH4）2SO4的结合方式存在. 苏州市PM2.5中水溶性离子的主要来源包括工业源、燃烧源、二次过程和建筑土壤尘等. |
| 英文摘要 |
| A total of 87 daily PM2.5 samples were collected in the urban area of Suzhou city during 2015, representing spring, summer, autumn, winter, respectively. Mass concentration of PM2.5 was analyzed gravimetrically. Water-soluble inorganic ions, including F-, Cl-, NO3-, SO42-, Na+, NH4+, K+, Mg2+and Ca2+, were determined by ion chromatography. The average mass concentration of PM2.5 was (74.26±38.01) μg·m-3. The seasonal variations of PM2.5 concentrations decreased in the order of winter > spring > autumn > summer. The average total mass concentrations of 9 ions was (43.95±23.60) μg·m-3, and the order of concentration of ions was NO3- > SO42- > NH4+ > Na+ > Cl- > K+ > Ca2+ > F- > Mg2+. Seasonal variation of ion concentrations was significant, with the highest concentration observed in winter and the lowest in summer. The secondary inorganic species, including SO42-, NO3- and NH4+ (SNA) were the major components of the water-soluble ions in PM2.5. SNA's correlations with each other were significant. SO42-, NO3- and NH4+ were probably in the form of NH4NO3 and (NH4)2SO4. The [NO3-]/[SO42-] ratio approaching to 1 implied that mobile sources were as important as stationary sources. Ion balance calculations indicated strong correlations between anion and cation equivalents. The PM2.5 was acidic. Industrial emission, combustion process, secondary formation and fugitive dust were the major sources of the water-soluble ions in PM2.5.. |
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