| 引用本文: | 刘随心,曹军骥,何建辉,徐红梅.2013.西安大气PM2.5中有机氮和无机氮的理化特征[J].地球环境学报,(2):1272-1280 |
| LIU Sui-xin,CAO Jun-ji,HO Kin-fai,XU Hong-mei.2013.Characteristics of water-soluble organic and inorganic nitrogen in atmospheric fine particles (PM2.5) from Xi′an[J].Journal of Earth Environment,(2):1272-1280 |
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| 摘要: |
| 本文于2008年7月至2009年8月在西安站点开展了大气细粒子（PM2.5, 空气动力学粒径小于等于2.5 μm的大气颗粒物）中含氮组分的观测，通过元素分析仪、TOC分析仪，离子色谱分析获得PM2.5中的总氮（TN）、水溶性总氮(WSN)、水溶性无机氮（WSIN），水溶性有机氮（WSON）的年平均浓度分别为9.35 μg·m-3、 8.93 μg·m-3、5.31 μg·m-3、3.62 μg·m-3，其中WSN占同期大气PM2.5质量浓度的7.04%，WSON对总氮的贡献达43%，说明水溶性有机氮是西安大气细粒子中氮的主要组分。氮组分浓度水平明显分为秋、冬季高值和春、夏季低值的模式；WSON在各个季节、月份的百分比变化以及与部分离子相关性分析，揭示了西安有机氮和无机氮组分受不同的来源影响，其中生物质燃烧、腐殖质、农业活动等对水溶性有机氮贡献显著。 |
| 关键词: PM2.5 水溶性有机氮 无机氮 总氮分析 |
| DOI：10.7515/JEE201302006 |
| CSTR：32259.14.JEE201302006 |
| 分类号:X513 |
基金项目:中国科学院战略性先导科技专项(XDA05100400)；2012年陕西省科技统筹创新工程(2012KTZB030101)
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| 英文基金项目: |
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| Characteristics of water-soluble organic and inorganic nitrogen in atmospheric fine particles (PM2.5) from Xi′an |
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LIU Sui-xin1, CAO Jun-ji1, HO Kin-fai1,2, XU Hong-mei1
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1.Key Laboratory of Aerosol Science & Technology, State Key Laboratory of Loess and Quaternary Geology,
Institute of Earth Environment, Chinese Academy of Sciences, Xi′an 710075, China; 2.School of Public Health and Primary Care, The Chinese University of Hong Kong, Hong Kong, China
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| Abstract: |
| Abstract:The atmospheric deposition of nitrogen is a focus of both scientific and policy concern, because of the importance of nitrogen (N) in acidification of soils and aquatic systems, nutrient enrichment, tropospheric ozone processes, and particulate matter. 65 PM2.5 (PM2.5, particulate matter with aerodynamic diameters less than 2.5 μm) samples collected at Xi′an from July 5, 2008 to August 8, 2009 were applied to analyze the concentrations of total nitrogen (TN), water-soluble nitrogen (WSN), water-soluble organic nitrogen (WSON), and water-soluble inorganic nitrogen (WSIN), the concentrations were 9.35 μg·m-3, 8.93 μg·m-3, 5.31 μg·m-3, 3.62 μg·m-3, respectively. The contribution of WSN to PM2.5 mass concentrations was 7.04%, and the contribution of WSON to WSN was about 43%, the results showed that WSON was an important component of nitrogen in PM2.5 at Xi′an. All the concentrations of nitrogenous composition were higher in autumn and winter than other seasons. The temporal variations of the percentage of WSON in WSN and relationship between WSON and inorganic ions suggest that WSON and WSIN have different source contributions, and impacts from biomass burning, humus, and agricultural production. |
| Key words: PM2.5 organic nitrogen inorganic nitrogen total nitrogen analyzing |
