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北京冬季一次重污染过程PM2.5中水溶性无机盐的变化特征

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金鑫, 程萌田, 温天雪, 唐贵谦, 王辉, 王跃思. 北京冬季一次重污染过程PM2.5中水溶性无机盐的变化特征[J]. 环境化学, 2012, 31(6): 783-790.
引用本文: 金鑫, 程萌田, 温天雪, 唐贵谦, 王辉, 王跃思. 北京冬季一次重污染过程PM2.5中水溶性无机盐的变化特征[J]. 环境化学, 2012, 31(6): 783-790.
shu
JIN Xin, CHENG Mengtian, WEN Tianxue, TANG Guiqian, WANG Hui, WANG Yuesi. The variation of water-soluble inorganic ions during a heavy pollution episode in winter, Beijing[J]. Environmental Chemistry, 2012, 31(6): 783-790.
Citation: JIN Xin, CHENG Mengtian, WEN Tianxue, TANG Guiqian, WANG Hui, WANG Yuesi. The variation of water-soluble inorganic ions during a heavy pollution episode in winter, Beijing[J]. Environmental Chemistry, 2012, 31(6): 783-790.
shu

北京冬季一次重污染过程PM2.5中水溶性无机盐的变化特征

  • 1.

    中国科学院大气物理研究所, 北京, 100029;

  • 2.

    甘肃农业大学林学院, 兰州, 730060

  • 基金项目:

    北京市科技计划公益应用项目(D09040903670902)

    中国科学院战略性先导性科技专项(XDA05100100)

    国家自然科学基金(41021004)资助.

The variation of water-soluble inorganic ions during a heavy pollution episode in winter, Beijing

  • 1.

    Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, 100029, China;

  • 2.

    College of Forestry, Gansu Agricultural University, Lanzhou, 730060, China

  • Fund Project:

  • 摘要: 为了解北京冬季重污染过程大气颗粒物化学特性,利用高时间分辨率实时在线细粒子快速捕集及化学成分分析系统(RCFP-IC)对2011年2月18 —24日发生的一次重污染过程PM2.5中水溶性无机离子浓度变化进行了在线观测.结合颗粒物质量浓度、气态污染物浓度及气象资料,对此次污染过程中污染物的化学成分变化特征进行了详细分析.结果表明,此次北京冬季重污染4 d中颗粒物污染严重;总水溶性无机离子平均质量浓度151.31 μg·m-3,占PM2.5相对比例54%,其中NO3-、SO42-和NH4+质量浓度占总水溶性无机离子质量浓度91%,二次离子污染非常严重;硝酸根氧化率(NOR)和硫酸根氧化率(SOR)结果显示NO3-与SO42-主要通过非均相反应生成,水溶性无机盐存在形态以NH4HSO4和(NH4)2SO4为主;重污染期K+和Cl-质量浓度显著升高,Mg2+和Ca2+质量浓度下降;阳、阴离子电荷比(C/A)重污染平均值为0.8,细粒子偏酸性.
    Abstract: To investigate the chemical characteristics of heavy atmospheric pollution of particulate matter in Beijing, the concentrations of water-soluble inorganic ions were observed using the rapid collection of atmospheric particles and the chemical component online analysis system (RCFP-IC) from 18 to 24 February, 2011 during a heavy pollution episode. Combined with the mass concentration of particulate matter, gaseous pollutant concentrations and meteorological data, we analyzed the characteristics of water-soluble inorganic ions in detail for this episode. The results showed that particulate pollution was serious during 4 days of this winter heavy pollution in Beijing. The total concentration of water-soluble inorganic ions was 151.31 μg·m-3 and the relative proportions of PM2.5 was 54%,of which more than 90% was from NO3-,SO42- and NH4+. NOR and SOR showed that NO3- and SO42- were generated through the heterogeneous reaction. Water-soluble inorganic salts mainly existed in the form of NH4HSO4 and (NH4)2SO4.The concentrations of K+ and Cl- increased significantly,while Mg2 + and Ca2 + showed an opposite trend during the heavy pollution episode. The average of C/A was 0.8. Fine particles showed acidity.
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  • 收稿日期:  2011-10-28
金鑫, 程萌田, 温天雪, 唐贵谦, 王辉, 王跃思. 北京冬季一次重污染过程PM2.5中水溶性无机盐的变化特征[J]. 环境化学, 2012, 31(6): 783-790.
引用本文: 金鑫, 程萌田, 温天雪, 唐贵谦, 王辉, 王跃思. 北京冬季一次重污染过程PM2.5中水溶性无机盐的变化特征[J]. 环境化学, 2012, 31(6): 783-790.
shu
JIN Xin, CHENG Mengtian, WEN Tianxue, TANG Guiqian, WANG Hui, WANG Yuesi. The variation of water-soluble inorganic ions during a heavy pollution episode in winter, Beijing[J]. Environmental Chemistry, 2012, 31(6): 783-790.
Citation: JIN Xin, CHENG Mengtian, WEN Tianxue, TANG Guiqian, WANG Hui, WANG Yuesi. The variation of water-soluble inorganic ions during a heavy pollution episode in winter, Beijing[J]. Environmental Chemistry, 2012, 31(6): 783-790.
shu

北京冬季一次重污染过程PM2.5中水溶性无机盐的变化特征

  • 1.  中国科学院大气物理研究所, 北京, 100029;
  • 2.  甘肃农业大学林学院, 兰州, 730060
  • 收稿日期:  2011-10-28
基金项目:

北京市科技计划公益应用项目(D09040903670902)

中国科学院战略性先导性科技专项(XDA05100100)

国家自然科学基金(41021004)资助.

摘要: 为了解北京冬季重污染过程大气颗粒物化学特性,利用高时间分辨率实时在线细粒子快速捕集及化学成分分析系统(RCFP-IC)对2011年2月18 —24日发生的一次重污染过程PM2.5中水溶性无机离子浓度变化进行了在线观测.结合颗粒物质量浓度、气态污染物浓度及气象资料,对此次污染过程中污染物的化学成分变化特征进行了详细分析.结果表明,此次北京冬季重污染4 d中颗粒物污染严重;总水溶性无机离子平均质量浓度151.31 μg·m-3,占PM2.5相对比例54%,其中NO3-、SO42-和NH4+质量浓度占总水溶性无机离子质量浓度91%,二次离子污染非常严重;硝酸根氧化率(NOR)和硫酸根氧化率(SOR)结果显示NO3-与SO42-主要通过非均相反应生成,水溶性无机盐存在形态以NH4HSO4和(NH4)2SO4为主;重污染期K+和Cl-质量浓度显著升高,Mg2+和Ca2+质量浓度下降;阳、阴离子电荷比(C/A)重污染平均值为0.8,细粒子偏酸性.

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