| 京津冀区域气溶胶中无机水溶性离子污染特征分析 |
| 摘要点击 9194 全文点击 4520 投稿时间：2010-06-08 修订日期：2010-09-17 |
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| 中文关键词 京津冀 水溶性 二次离子 气溶胶 特征 |
| 英文关键词 Beijing, Tianjin and Hebei (BTH) water-soluble secondary ion aerosol characteristic |
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| 中文摘要 |
| 在北京、天津、石家庄、承德城区和北京上甸子区域本底站共设置5个采样点，2009～2010年分季节采集环境PM2.5，并分析其中的无机水溶性离子，进而研究京津冀区域气溶胶中离子组分的污染特征.研究表明，京津冀PM2.5污染较重，北京、天津和石家庄年均浓度均超过了100 μg/m3；5个站点二次离子(SO2-4、NO-3、NH+4)总年均浓度为22～75 μg/m3，二次离子春夏两季浓度较高，且夏季SO2-4浓度水平远远高于NO-3.反映地壳组分的Mg2+和Ca2+春季浓度较高，其中天津和石家庄2个城市地壳组分的污染相对较重；北京市区PM2.5和二次离子污染特征与2004前相比有较大变化，PM2.5浓度四季较稳定，二次离子夏季明显高于其它季节，NO-3/SO2-4比值较以往明显升高；上甸子PM2.5和二次离子污染受到北京城区的影响较大. |
| 英文摘要 |
| PM2.5 samples were collected at five sites in BTH (Beijing Tianjin and Hebei) area (four urban sites of Beijing, Tianjin, Shijiazhuang, Chengde, and one site of Shangdianzi background station) from 2009 to 2010. The inorganic water-soluble ions were analyzed and spatio-temporal characteristics of ions were concluded. The concentrations of PM2.5 were quite high, with annual average more than 100μg/m3 in Beijing, Tianjin and Shijiazhuang. The annual average concentrations of secondary ions (SO2-4, NO-3, NH+4) were 22-75 μg/m3 at five sites, and higher in the spring and summer. In BTH, SO2-4 concentrations were much higher than NO-3 in the summer,and Mg2+ and Ca2+ were higher in the spring. Mg2+ and Ca2+ were much higher in Tianjin and Shijiazhuang, reflecting more crust materials pollution. The characteristics of PM2.5 and water-soluble ions for Beijing in this paper were very different from the similar studies before 2004, showing more stable PM2.5 concentrations in four seasons, higher secondary ions in summer, and higher NO-3/SO2-4 than before. The results of Shangdianzi background station (SDZ) also showed that the aerosol pollution of SDZ was largely influenced by Beijing urban area. |
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