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贵阳秋季PM2.5水溶性离子组成特征及来源解析

Composition and source analysis of water-soluble ions in PM2.5 during autumn in Guiyang

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【作者】 肖浩肖化云吴攀肖红伟张忠义郑能建

【Author】 XIAO Hao;XIAO Huayun;WU Pan;XIAO Hongwei;ZHANG Zhongyi;ZHENG Nengjian;College of Resources and Environmental Engineering, Guizhou University;State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry,Chinese Academy of Sciences;Jiangxi Province Key Laboratory of the Causes and Control of Atmospheric Pollution,East China University of Technology;

【通讯作者】 肖化云;

【机构】 贵州大学资源与环境工程学院中国科学院地球化学研究所环境地球化学国家重点实验室东华理工大学江西省大气污染成因与控制重点实验室

【摘要】 水溶性无机离子是PM2.5的主要组分之一,对研究PM2.5的物理化学性质,来源及其形成机理具有重要意义.本研究于2017年9月—2017年11月期间在贵阳城区采集了80个PM2.5样品,并测定了8种水溶性离子浓度,探讨贵阳秋季PM2.5水溶性离子组成特征及来源.结果表明贵阳秋季PM2.5中无机离子的平均质量浓度为15.99μg·m-3,阴离子和阳离子的平均质量浓度分别为10. 90μg·m-3、5. 09μg·m-3; SO42-(8. 53±4.63μg·m-3)平均质量浓度最高,其次是NH4+(2.56±1.62μg·m-3)、NO3-(2.21±2.96μg·m-3)、Ca2+(1.98±0.88μg·m-3),最后依次是K+(0.37±0.24μg·m-3)、Cl-(0.16±0.11μg·m-3)、Mg2+(0.11±0.03μg·m-3)、Na+(0.07±0.06μg·m-3); NH4+、SO42-、NO3-是主要水溶性离子,所占比例为83%; NO3-/SO42-值平均为0.21±0.12,远小于1,说明贵阳秋季PM2.5以固定源污染为主.相关性分析表明,PM2.5中NH4+主要以(NH42SO4、NH4HSO4、NH4NO3的形式存在,Ca2+与Mg2+来源可能相同.结合富集系数分析NO3-、SO42-、Ca2+、K+、Mg2+基本都是来源于陆源贡献,NO3-、SO42-是人为源,Ca2+、K+、Mg2+是地壳源,此外Mg2+还有一部分海源贡献.

【Abstract】 Composition analysis of water-soluble ions( WSIs) in fine particulate aerosol is of great significance for understanding the physical and chemical characteristics,sources and formation mechanism of PM2.5. In the present study,a total of eighty PM2.5 samples were collected in Guiyang urban area from September to November, 2017. Eight water-soluble ions were deterained to investigate the composition and sources of PM2.5 water-soluble ions during autumn in Guiyang.Results showed that the average concentration of inorganic ions was 15. 99 μg·m-3,while the averaged mass concentrations of anions and cations were respectively 10. 90 μg·m-3 and 5.09 μg·m-3. Among the interested ionic species,SO42-( 8. 53 ± 4. 63 μg·m-3) was the highest,followed by NH4+( 2.56±1.62 μg·m-3),NO3-( 2.21±2.96 μg·m-3) and Ca2+( 1.98±0.88 μg·m-3),while other ions ranked as K+( 0. 37 ± 0. 24 μg·m-3),Cl-( 0. 16 ± 0. 11 μg·m-3),Mg2+ ( 0. 11 ±0.03 μg·m-3) 、Na+( 0.07±0.06 μg·m-3). In general,NH4+,SO42- and NO3- were the main watersoluble ions,accounting for 83% of total inorganic ions. The ratio of NO3-/SO42-( 0.21±0.12) was much lower than unit,indicating that Guiyang PM2.5 mainly suffered stationary source pollution during the sampling time. The correlation analysis showed that most of NH4+ existed in the form of(NH42SO4,NH4HSO4 and NH4NO3 in PM2.5. Enrichment factor analysis relative to seawater and soil indicated that NO3-,SO42-,Ca2+,K+,and Mg2+ were basically derived from terrestrial sources,while SO42- and NO3- were from the anthropogenic source,Ca2+,K+,and Mg2+ mainly from crustal sources,a part of Mg2+ was from the sea source.

【基金】 国家自然科学基金(41425014,41663003)资助~~
  • 【文献出处】 环境化学 ,Environmental Chemistry , 编辑部邮箱 ,2019年03期
  • 【分类号】X513
  • 【网络出版时间】2019-03-04 17:29
  • 【被引频次】16
  • 【下载频次】326
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