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为了研究汽车尾气颗粒物的结构和氮的种态,使用扫描透射X射线显微成像(STXM)技术研究了桑塔纳3000和高尔汽车尾气颗粒物. STXM表明单颗粒物的粒径为500 nm,颗粒物质量分布不均匀,有中间空洞. 比较汽车尾气颗粒物和(NH4)2SO4和NaNO3中N的1s X射线近边吸收精细结构谱(NEXAFS),铵盐在406 eV有显著的σ*吸收峰,有肩部结构; 汽车尾气颗粒物和NaNO3中N的近边吸收谱在412 eV和418.5 eV有明显的σ吸收峰; (NH4)2SO4中N的近边吸收谱在413.5 eV和421.8 eV更宽的σ吸收峰. 硝酸盐是汽车尾气颗粒物中的N化学种态的主要存在形式. 在395—418 eV能量范围内对桑塔纳3000汽车尾气颗粒物进行堆栈扫描,经过主成分分析和聚类分析,发现其表层主要为硝酸盐,内部有少量铵盐.
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关键词:
- 扫描透射X射线显微成像 /
- X射线吸收近边精细结构光谱 /
- 汽车尾气颗粒物
In order to understand the structures of automobile exhaust particles and the components of nitrogen inside them,automobile exhaust particles from Santana 3000 and Golcars are investigated with scanning transmission X-ray microscopy (STXM) and the near edge X-ray absorption fine structure (NEXAFS) spectra. The results of STXM show that single particulate has a size of 500 nm and a nonuniform mass distribution with an empty hole inside it. Compared with the NEXAFS spectra,(NH4)2SO4 and NaNO3 spectra show many different σ* resonances at 406 eV,the spectrum of ammonium has a shoulder structure. NaNO3 and automobile exhaust particles show significant σ resonances at 412 eV and 418.5 eV. However,(NH4)2SO4 shows wider σ resonances 413.5 eV and 421.8 eV. Nitrates are main chemical species of nitrogen in automobile exhaust particles. In an energy range from 395 eV to 418 eV,Santana 3000 automobile exhaust particles are stack scanned. The principal component analysis and cluster analysis indicate that there exist nitrates in surface layer and minor ammonium inside it.-
Keywords:
- scanning transmission X-ray microscopy /
- near edge X-ray absorption fine structure /
- automobile exhaust particle
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[22] Jeong H,Kim C 2007 Bull. Korean Chem. Soc. 28 413
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[1] Sthr J 1996 NEXAFS spectroscopy. Springer 1
[2] Braun A,Shah N,Huggins F,Huffman G,Wirick S,Jacobsen C,Kelly K,Sarofim A 2004 Fuel 83 997
[3] Braun A,Mun B,Huggins F,Huffman G 2007 Environ. Sci. Technol 41 173
[4] Braun A 2005 J. Environ. Monit. 7 1059
[5] Chen J 1997 Surface Science Reports 30 1
[6] Tang Y H,Lin L W,Guo C 2006 Acta Phys. Sin. 55 4197 (in Chinese) [唐元洪、林良武、郭 池 2006 物理学报 55 4197]
[7] Fang C Y,Zhang X S,Tang J C,Sui H,Xu Y B,Xu S H,Pang H B,Xu P S 1997 Acta Phys. Sin. 46 122 (in Chinese) [范朝阳、张训生、唐景昌、隋 华、徐亚伯、徐世红、潘海斌、徐彭寿 1997 物理学报 46 122]
[8] Wu T Q,Tang J C,Zhu P,Li H Y 2005 Acta Phys. Sin. 54 5837 (in Chinese) [吴太权、唐景昌、朱 萍、李海洋 2005 物理学报 54 5837]
[9] Brandes J A,Cody G D,Rumble D,Haberstroh P,Wirick S,Gelinas Y 2008 Carbon 46 1424
[10] Braun A,Huggins F,Kubátová A,Wirick S,Maricq M,Mun B,McDonald J,Kelly K,Shah N,Huffman G 2007 Environ. Sci. Techno 42 374
[11] Hitchcock A,Morin C,Li L,Brash J,Scholl A,Doran A 2004 Microsc. Microanal. 10 1050
[12] Sluder C,Storey J,Lewis S,Lewis L 2005 SAE Technical Paper 1 1
[13] Matti Maricq M 2007 J. Aerosol Sci 38 1079
[14] Wichmann H 2007 Inhalation Toxicol. 19 241
[15] Nicolai T,Carr D,Weiland S,Duhme H,Von Ehrenstein O,Wagner C,Von Mutius E 2003 Eur. Respir. J. 21 956
[16] Van Vliet P,Knape M,de Hartog J,Janssen N,Harssema H,Brunekreef B 1997 Environ. Res. 74 122
[17] Zeng F G 2002 Journal of The Central University for Nationalities (Natural Sciences Edition) 2 137 (in Chinese) [曾凡刚 2002 中央民族大学学报(自然科学版) 2 137]
[18] Jiang D,Qiu Z J,Lu R R,Qiu H Y,Zhu J Q,Li X L 2002 Nucl. Sci. Tech. 13 57
[19] Cheng P,Chu Y N,Zhang W J,Patrik S,David S 2004 Chin. J. Anal. Chem. 32 113 (in Chinese) [程 平、储焰南、张为俊、Patrik S、David S 2004 分析化学 32 113 Dou L X,Shen J N,Li YD,Cheng K Y,Wang W L,Liu B T 2007 Vehicle Engine 2 65 (in Chinese) 〖豆立新、沈 健、李永丹、程魁玉、王务林、刘伯谭 2007 车用发动机 2 65 Yang S S,Shao L Y 2007 Acta Sci. Circumst. 27 185 (in Chinese) 〖杨书申、邵龙义 2007 环境科学学报 27 185]
[20] Leinweber P,Kruse J,Walley F,Gillespie A,Eckhardt K,Blyth R,Regier T 2007 J. Synchrotron Radiat. 14 500
[21] Trk S,Osan J,Beckhoff B,Ulm G 2004 Powder Diffr. 19 81
[22] Jeong H,Kim C 2007 Bull. Korean Chem. Soc. 28 413
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