北京城区夏季PM2.5中碳组分和二次水溶性无机离子浓度特征
Characteristics of carbon components and secondary water-soluble inorganic ions in PM2.5 in summer in urban Beijing
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摘要: 为探索北京城区大气细颗粒物浓度水平及其碳组分和二次水溶性无机离子的浓度特征,于2014年6月1日至7月15日在车公庄地区使用微量振荡天平(TEOM+FDMS)、EC/OC在线分析仪以及水溶性离子在线分析仪对PM2.5质量浓度及其主要化学组分(OC、EC、SO42-、NO3-和NH4+)进行了实时监测.研究结果表明,北京市城区夏季PM2.5质量浓度平均值为69.0±47.9 μg·m-3, PM2.5中OC、EC、SO42-、NO3-和NH4+所占的比例分别为15.8%、2.4%、23.0%、15.7%和19.2%,SNA (SO42-、NO3-和NH4+)合计达到了PM2.5质量浓度的57.9%.研究各组分的日变化特征发现,OC和SO42-白天浓度变化较小,夜晚浓度稍高; NO3-和NH4+则随着光照和温度的增加而逐渐降低;EC呈现出夜晚浓度高白天浓度低的特点.研究各组分的相关性及比值发现, OC和EC的相关系数为0.62, OC/EC大于2.0,说明北京城区夏季存在着较为严重的二次污染;此外, NO3-/SO42-平均比值为0.68, SOR和NOR的变化趋势基本一致,两者的平均值分别为0.55和0.14.通过分析北京市城区夏季不同浓度级别各组分的变化发现,随着PM2.5质量浓度的增加,OC和EC所占的比例不断降低,而SNA比例则不断升高,其中NO3-浓度水平的增加最为显著.Abstract: To investigate the characteristics of fine particalate matters in urban Beijing, on-line measurements of PM2.5 mass and the main chemical composition in PM2.5 (OC,EC,SO42-,NO3- and NH4+) were conducted in the area of Chegongzhuang from June 1st to July 15th,2014 by using TEOM+FDMS, the Sunset OC/EC field analyzer and the URG ambient ion monitor. The results showed that the average mass concentration of PM2.5 was 69.0 ±47.9 μg·m-3 and the mass contribution of OC,EC,SO42-,NO3- and NH4+ in PM2.5 was 15.8%,2.4%,23.0%,15.7% and 19.2%,respectively. The sum of these three secondary water-soluble inorganic ions (SNA) accounted for more than one half of the PM2.5 mass concentration (57.9%), which had become the major source of PM2.5 in urban Beijing. In addition, the daily of OC and SO42- was small in the daytime and higher at night. NO3- and NH4+ decreased gradually with the elevation of sunshine and temperature; EC was higher at the night and lower in the daytime. The correlation coefficient between OC and EC was 0.62, and the ratios of OC/EC were all larger than 2.0, suggesting the importance of secondary organic aerosols in the formation of particle pollution. Furthermore, the ratio of NO3-/SO42- was 0.68, and similar variation pattern of SOR and NOR were observed, the daily values of which were 0.55 and 0.14, respectively. Finally, elevated contributions of secondary inorganic species and a corresponding decrease of organics were observed as the increasing of PM2.5. Among the inorganic species, nitrate presented the largest increase from 12.8% to 17.8%, indicating the enhanced roles of secondary species in the particle pollution.
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[1] FANG M, CHAN C K, YAO X H. Managing air quality in a rapidly developing nation: China[J]. Atmospheric Environment, 2009, 43: 79-86. [2] 曹军骥. PM2.5与环境[M]. 第一版. 北京:科学出版社, 2014: 1-8. CAO J J. PM2.5
and the environment in China[M]. Beijing: Science Press,2014:1-8(in Chinese).[3] CAO J J, SHEN Z X, CHOW J C, et al. Winter and summer PM2.5 chemical compositions in fourteen Chinese cities[J]. Journal of the Air & Waste Management Association, 2012, 62(10): 1214-1226. [4] 刀谞,张霖琳,王超,等.京津冀冬季与夏季PM2.5/PM10及其水溶性离子组分区域性污染特征分析[J].环境化学,2015,34(1):60-69. DAO X, ZHANG L L, WANG C, et al. Characteristics of mass and ionic compound of atmospheric particles in winter and summer of Beijing-Tianjin-Hebei area[J]. Environmental Chemistry, 2015, 34(1):60-69(in Chinese).
[5] 安欣欣,赵越,魏强,等.北京城区PM2.5中有机碳和元素碳的变化特征 [J].环境科学与技术,2015,38(8):214-219. AN X X, ZHAO Y, WEI Q, et al. Characteristics of organic carbon and elemental carbon in PM2.5 in urban of Beijing[J]. Environmental Science and Technology, 2015, 38(8):214-219(in Chinese).
[6] [7] 王东方,高松,段玉森,等.上海中心城区冬季PM2.5中有机碳和元素碳组成变化特征[J].环境科学与技术,2012,35(7):55-58 ,72. WANG D F, GAO S, DUAN Y S, et al. Characteristics of organic carbon and elemental carbon in PM2.5 at urban center of Shanghai in winter[J]. Environmental Science and Technology, 2012, 35(7):55-58,72(in Chinese).
[8] 周敏,陈长虹,王红丽,等. 上海市秋季典型大气高污染过程中颗粒物的化学组成变化特征[J]. 环境科学学报,2012,32(1):81-92. ZHOU M, CHEN C H, WANG H L, et al. Chemical characteristics of particulate matters during air pollution episodes in autumn of Shanghai, China[J].Acta Scientiae Circumstantiae, 2012, 32(1):81-92(in Chinese).
[9] 董海燕,古金霞,陈魁,等. 天津市区PM2.5中碳组分污染特征及来源分析[J]. 中国环境监测,2014,29(1):34-38. DONG H Y, GU J X, CHEN K, et al. Character and source analysis of carbonaceous aerosol in PM2.5 in the center of Tianjin City[J]. Environmental Monitoring in China, 2014,29(1):34-38(in Chinese).
[10] 孙韧,张文具,董海燕,等. 天津市PM10和PM2.5中水溶性离子化学特征及来源分析[J]. 中国环境监测,2014,30(2):145-150. SUN R, ZHANG W J, DONG H Y, et al. Chemical character and source analysis of water-soluble irons in PM10 and PM2.5 in Tianjin city[J]. Environmental Monitoring in China, 2014,30(2):145-150(in Chinese).
[11] 代志光,张承中,李勇,等. 西安夏季PM2.5中碳组分与水溶性无机离子特征分析[J]. 环境工程学报,2014,8(10):4366-4372. DAI Z G, ZHANG C Z, LI Y, et al. Analysis of carbon components and water-soluble inorganic ions in PM2.5 of Xi'an during summer[J]. Chinese Journal of Environmental Engineering, 2014,8(10): 4366-4372(in Chinese).
[12] 汪伟峰,俞杰,许丹丹,等. 宁波市区冬季大气颗粒物及其主要组分的污染特征分析[J]. 中国环境监测,2013,29(5): 43-46. WANG W F, YU J, XU D D, et al. Pollution characteristics of particles and its main components in Ningbo urban atmosphere[J]. Environmental Monitoring in China, 2013,29(5):43-46(in Chinese).
[13] 安欣欣. 有机碳元素碳半连续分析仪的使用与维护[J]. 分析仪器,2015,(2):90-93. AN X X. Use and maintenance of semi-continuous OCEC carbon aerosol analyzer [J]. Analytical Instrumentation, 2015 ,(2): 90-93(in Chinese).
[14] 刘辉,贺克斌,马永亮,等.2008年奥运前后北京城郊PM2.5及其水溶性离子变化特征[J]. 环境科学学报,2011,31(1):177-185. LIU H, HE K B, MA Y L, et al. Variations of PM2.5 and its water-soluble ions in urban and suburban Beijing before during and after the 2008 Olympiad[J]. Acta Scientiae Circumstantiae, 2011, 31(1): 177-185(in Chinese).
[15] 赵普生,张小玲,孟伟,等.京津冀区域气溶胶中无机水溶性离子污染特征分析[J]. 环境科学, 2011,32(6): 1546-1549. ZHAO P S, ZHANG X L, MENG W, et al. Characteristics of inorganic water-soluble ions from aerosols in Beijing-Tianjin-Hebei area[J]. Environmental Science, 2011,32(6): 1546-1549(in Chinese).
[16] 刘保献,张大伟,陈添,等.北京市PM2.5主要化学组分浓度水平研究与特征分析[J]. 环境科学学报,2015,35(12): 4053-4060. LIU B X, ZHANG D W, CHEN T, et al. Characteristics of major chemical compositions of PM2.5 in Beijing[J]. Acta Scientiae Circumstantiae, 2015, 35(12): 4035-4060(in Chinese).
[17] 陈诚,陈辰,汤莉莉,等.江苏沿江城市PM10和PM2.5中水溶性离子特征及来源分析[J].环境化学,2014,33(12):2123-2135. CHEN C, CHEN C, TANG L L, et al. Characteristics and source analysis of water-soluble ions in PM10 and PM2.5 in cities along the Yangtze river of Jiangsu province[J]. Environmental Chemistry, 2014, 33(12):2123-2135(in Chinese).
[18] TURPIN B J, HUNTZICKER J J. Identification of secondary organic aerosol episodes and quantitation of primary and secondary organic aerosol concentrations during SCAQS [J]. Atmospheric Environment, 1995,29(23):3527-3544. [19] [20] 于建华,虞统,杨晓光,等. 北京冬季PM2.5中元素碳、有机碳的污染特征[J].环境科学研究,2004,17(1):48-50 ,55. YU J H, YU T, YANG X G, et al. Characteristics of organic carbon and elemental carbon in PM2.5 in Beijing in winter[J]. Research of Environmental Sciences, 2004, 17(1): 48-50,55(in Chinese).
[21] CASTRO L M, PIO C A, HARRISON R M, et al. Carbonaceous aerosol in urban and rural European atmosphere: Estimation of secondary organic carbon concentrations[J]. Atmospheric Environment, 1999, 33(17): 2771-2781. [22] 唐孝炎,张远航,邵敏. 大气环境化学[M].(第二版). 北京:高等教育出版社,2006:305-330. TANG X Y, ZHANG Y H, SHAO M. Atmospheric environmental chemistry [M]. Beijing: Higher Education Press, 2006: 305 -330(in Chinese).
[23] 贺克斌,杨复沫,段凤魁,等. 大气颗粒物与区域复合污染[M].第一版. 北京:科学出版社,2011:234-252. HE K B, YANG F M,DUAN F K, et al.Atmospheric particulate and regional compound pollution[M]. Beijing: Science Press, 2011: 234 -252(in Chinese).
[24] SACHIO OHTA, TOSHIICHI OKITA. A chemical characterization of atmospheric aerosol in Sapporo [J]. Atmospheric Environment. Part A. General Topics,1990,24 (4):815-822. -
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