| 徐州市冬季大气细颗粒物水溶性无机离子污染特征及来源解析 |
| 摘要点击 3377 全文点击 1045 投稿时间：2017-03-15 修订日期：2017-06-01 |
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| 中文关键词 徐州市 PM2.5 水溶性无机离子 霾 来源解析 |
| 英文关键词 Xuzhou PM2.5 water soluble inorganic ions haze source |
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| 中文摘要 |
| 本研究于2015年12月至2016年2月在徐州市城区采集大气细颗粒物PM2.5样品共32套，使用离子色谱法分析了颗粒物中的F-、Cl-、NO3-、SO42-、Na+、Mg2+、NH4+、K+和Ca2+的质量浓度.观测期间，徐州市冬季PM2.5的平均质量浓度为（164.8±77.3） μg·m-3，9种水溶性离子总质量浓度为（67.5±36.1） μg·m-3，占PM2.5的40.9%，各离子浓度高低顺序为NO3- > SO42- > NH4+ > Cl- > Ca2+ > K+ > Na+ > Mg2+ > F-，其中NH4+、NO3-和SO42-是最主要的水溶性离子.清洁大气、轻度霾和重度霾时期PM2.5中总水溶性无机离子（WSⅡs）质量浓度分别为（12.8±8.8）、（59.0±22.8）、（86.3±36.0） μg·m-3，SNA分别占WSⅡs的86.4%、82.8%和78.9%. NH4+、NO3-和SO42-三者之间相关性显著，在PM2.5中的结合方式为（NH4）2SO4和NH4NO3.徐州市PM2.5中水溶性离子的主要来源为二次转化、生物质燃烧、化石燃料燃烧和矿物粉尘等. |
| 英文摘要 |
| A total of 32 daily PM2.5 samples were collected from December 2016 to February 2017 in the urban area of Xuzhou city. Water-soluble inorganic ions (WSⅡs), including F-, Cl-, NO3-, SO42-, Na+, Mg2+, NH4+, K+ and Ca2+, were determined by ion chromatography. The average mass concentration of PM2.5 was (164.8±77.3) μg·m-3 and the average total mass concentration of the nine ions was (67.5±36.1) μg·m-3, the contribution of the WSⅡs to the PM2.5 was more than 40.9%. The order of the concentrations of individual ions was NO3- > SO42- > NH4+ > Cl- > Ca2+ > K+ > Na+ > Mg2+ > F-. NH4+, NO3-, and SO42- (SNA) were the major components of the water-soluble ions in the PM2.5 measurement. The average mass concentration of WSⅡs in clean air, mild haze, and severe haze was (12.8±8.8), (59.0±22.8) and (86.3±36.0) μg·m-3, respectively. The contribution of SNA to WSⅡs was 86.4%, 82.8%, and 78.9%, respectively. The correlation between each component of SNA with each other was significant. NH4+, NO3-, and SO42- were in the form of (NH4)2SO4 and NH4NO3. Secondary formation, biomass burning, fossil fuel combustion, and dust were the major sources of the water-soluble ions in PM2.5. |
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