| 本溪市PM2.5中水溶性离子季节性变化特征及来源分析 |
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| 引用本文： | 张敬巧,王涵,胡君,张萌,柴发合,段菁春,王淑兰.本溪市PM2.5中水溶性离子季节性变化特征及来源分析[J].环境科学研究,2019,32(2):246-252. |
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| 作者姓名： | 张敬巧 王涵 胡君 张萌 柴发合 段菁春 王淑兰 |
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| 作者单位： | 中国环境科学研究院,北京,100012;中国环境科学研究院, 北京 100012;南京信息工程大学, 江苏省大气环境与装备技术协同创新中心, 江苏 南京 210044 |
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| 基金项目： | 国家科技支撑计划项目（No.2014BAC23B05） |
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| 摘 要： | 为研究本溪市大气PM2.5中水溶性离子污染特征，于2016年1—10月在本溪市开展PM2.5样品采集，使用离子色谱法分析了其中8种水溶性离子（Cl-、NO3-、SO42-、NH4+、Ca2+、Na+、Mg2+、K+），并采用PMF（positive matrix factorization，正矩阵因子分解法）模型对水溶性离子的来源进行分析.结果表明:观测期间，本溪市ρ（PM2.5）平均值为（57.6±21.9）μg/m3，ρ（PM2.5）季节性变化特征明显，呈冬季 > 秋季 > 春季 > 夏季趋势；水溶性离子平均质量浓度为19.3 μg/m3，占ρ（PM2.5）的33.6%，各离子质量浓度高低顺序为SO42- > NO3- > NH4+ > Cl- > Ca2+ > K+ > Na+ > Mg2+；SNA（SO42-、NO3-和NH4+）是PM2.5中主要的3种离子，在春季、夏季、秋季和冬季分别占水溶性离子的73.2%、88.2%、82.5%和73.6%，表明夏季的二次污染较为严重.阴、阳离子电荷平衡分析结果显示，阴离子相对亏损，本溪市PM2.5整体呈弱碱性，NO3-、SO42-与NH4+相关性较高，其在PM2.5中主要以NH4NO3和NH4HSO4的形式存在. PMF分析结果表明，本溪市PM2.5中水溶性离子的来源主要包括二次转化源、燃煤源和扬尘源.研究显示，本溪市PM2.5中水溶性离子季节性变化特征明显，二次转化源、燃煤源和扬尘源是其主要来源.
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| 关 键 词： | 本溪市 PM2.5 水溶性离子 SNA 来源 |
| 收稿时间： | 2018/3/13 0:00:00 |
| 修稿时间： | 2018/5/4 0:00:00 |
Seasonal Variation and Source Analysis of Water-Soluble Ions in PM2.5 in Benxi City |
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| ZHANG Jingqiao,WANG Han,HU Jun,ZHANG Meng,CHAI Fahe,DUAN Jingchun and WANG Shulan.Seasonal Variation and Source Analysis of Water-Soluble Ions in PM2.5 in Benxi City[J].Research of Environmental Sciences,2019,32(2):246-252. |
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| Authors: | ZHANG Jingqiao WANG Han HU Jun ZHANG Meng CHAI Fahe DUAN Jingchun and WANG Shulan |
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| Affiliation: | 1.Chinese Research Academy of Environmental Sciences, Beijing 100012, China2.China Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, Nanjing University of Information Science & Technology, Nanjing 210044, China |
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| Abstract: | PM2.5 samples were collected in Benxi City from January to October, 2016, and the water-soluble ions Cl-, NO3-, SO42-, NH4+, Ca2+, Na+, Mg2+ and K+ in the PM2.5 were determined by ion chromatography. The results showed during sample collection period ρ(PM2.5) was (57.56±21.9) μg/m3, and the seasonal variations of ρ(PM2.5) were obviously in the order of winter > autumn > spring > summer. The average water-soluble ion concentration was 19.3 μg/m3, which accounted for 33.6% of ρ(PM2.5). The ion concentration was in the order of SO42- > NO3- > NH4+ > Cl- > Ca2+ > K+ > Na+ > Mg2+. SO42-, NO3- and NH4+ (SNA) were the main ions in PM2.5, accounting for 73.2%, 88.2%, 82.5% and 73.6% of the water-soluble ions in spring, summer, autumn and winter, respectively, and showed that the secondary pollution in summer was more serious. The anion-to-cation ratio in each of the four seasons was less than one, which indicated that PM2.5 in Benxi City was slightly alkaline. NO3-, SO42- and NH4+ were highly correlated, and they were primarily in NH4NO3 and NH4HSO4 forms in PM2.5. PMF analysis revealed that secondary transformation, coal burning and dust were the main potential sources of the ionic components of PM2.5 in Benxi City. In conclusion, results showed that the seasonal variation was obvious of water-soluble ions in PM2.5 in Benxi City, and secondary transformation, coal burning and dust were the main sources. |
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| Keywords: | Benxi City PM2 5 water-soluble ions SNA source analysis |
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