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北京市延庆区PM2.5中主要水溶性无机离子特征及来源解析

张娟 王炜 赵颖

张娟, 王炜, 赵颖. 北京市延庆区PM2.5中主要水溶性无机离子特征及来源解析[J]. 环境工程技术学报, 2020, 10(2): 173-182. doi: 10.12153/j.issn.1674-991X.20190085
引用本文: 张娟, 王炜, 赵颖. 北京市延庆区PM2.5中主要水溶性无机离子特征及来源解析[J]. 环境工程技术学报, 2020, 10(2): 173-182. doi: 10.12153/j.issn.1674-991X.20190085
ZHANG Juan, WANG Wei, ZHAO Ying. Characteristics and source analysis of water-soluble inorganic ions in PM2.5 in Yanqing District, Beijing[J]. Journal of Environmental Engineering Technology, 2020, 10(2): 173-182. doi: 10.12153/j.issn.1674-991X.20190085
Citation: ZHANG Juan, WANG Wei, ZHAO Ying. Characteristics and source analysis of water-soluble inorganic ions in PM2.5 in Yanqing District, Beijing[J]. Journal of Environmental Engineering Technology, 2020, 10(2): 173-182. doi: 10.12153/j.issn.1674-991X.20190085

北京市延庆区PM2.5中主要水溶性无机离子特征及来源解析

doi: 10.12153/j.issn.1674-991X.20190085
详细信息
    作者简介:

    张娟(1981—),女,高级工程师,主要从事环境监测研究,yqxhjbhjcz@126.com。

  • 中图分类号: X513

Characteristics and source analysis of water-soluble inorganic ions in PM2.5 in Yanqing District, Beijing

  • 摘要: 对2017年6月—2018年5月北京市延庆区大气PM2.5样本进行采集,分析了PM2.5中9种水溶性无机离子的污染特征,并利用SPSS软件进行来源解析。结果表明:延庆区大气PM2.5中总水溶性无机离子平均浓度为28.0 μg∕m 3,其中,S O 4 2 - 、N O 3 - 和N H 4 + 是最主要的水溶性无机离子,合计占比为82.1%。受天气影响,N O 3 - 和S O 4 2 - 浓度均表现为秋高冬低,N H 4 + 浓度为秋高夏低;受冬季气象条件和施工影响,Ca 2+、Mg 2+、Na +浓度冬季最高。根据电荷平衡分析,春季PM2.5中阴、阳离子基本达到平衡状态,夏、秋季呈弱酸性,冬季呈弱碱性;PM2.5中硫氧化率(SOR)、氮氧化率(NOR)的均值分别为0.53和0.27,大气中存在明显的二次转化过程;N O 3 - ∕S O 4 2 - 为1.66,说明机动车尾气排放源对PM2.5中水溶性无机离子贡献较大;根据N H 4 + 与S O 4 2 - 、N O 3 - 、Cl -的相关性分析,PM2.5中N O 3 - 和S O 4 2 - 以(NH4)2SO4、NH4HSO4、NH4NO3以及HNO3形式存在。利用SPSS软件进行皮尔森相关性分析,PM2.5中N O 3 - 、S O 4 2 - 、N H 4 + 两两相关性强,说明二次反应显著;Ca 2+、Mg 2+、Na + 两两相关性强,说明其污染来源可能相同;Cl -与K +相关性强,说明大气中Cl -主要以KCl的形式存在。利用因子分析模块进行主成分分析,发现延庆区主要污染源为生物质燃烧、扬尘污染和机动车尾气排放。

     

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  • 收稿日期:  2019-05-14
  • 刊出日期:  2020-03-20

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