邯郸市冬季一次霾过程中细颗粒物化学组分的污染特征及消光贡献  

Pollution characteristics and extinction contribution of chemical composition in fine particulate matter during a winter haze episode in Handan

作　　者：刘召策 袁琦 胡伟 张代洲 薛凡利 武振晓 樊景森[1] 卢彦琦[1] 牛红亚[1] LIU Zhao-ce;YUAN Qi;HU Wei;ZHANG Dai-zhou;XUE Fan-li;WU Zhen-xiao;FAN Jing-sen;LU Yan-qi;NIU Hong-ya(Key Laboratory of Resource Exploration Research of Hebei Province,Hebei University of Engineering,Handan 056038,China;School of Earth Sciences,Zhejiang University,Hangzhou 310058,China;Institute of Surface-Earth System Science,Tianjin University,Tianjin 300072,China;Faculty of Environmental and Symbiotic Sciences,Prefectural University of Kumamoto,Kumamoto 8628502,Japan)

机构地区：[1]河北工程大学河北省资源勘测研究重点实验室,河北邯郸056038 [2]浙江大学地球科学学院,浙江杭州310058 [3]天津大学表层地球系统科学研究院,天津300072 [4]日本熊本县立大学环境共生学部,日本熊本8628502

出　　处：《地球化学》2020年第3期298-305,共8页Geochimica

基　　金：国家自然科学基金(41807305,41805118);河北省杰出青年科学基金(D2018402149);河北省高校百名优秀创新人才支持计划(SLRC2019021);河北省人才工程培养经费资助科研项目(A201803004);河北省教育厅自然科学基金(QN2017312)。

摘　　要：近年来京津冀地区大气环境污染受到广泛关注,邯郸作为京津冀南部地区燃煤为主的工业城市之一,大气污染问题较为突出。为厘清邯郸市冬季大气重污染发生时细颗粒物(PM2.5)中主要化学成分的形成过程及光学特性,本研究于2016年1月23~30日,采集了PM2.5样品,测定了水溶性离子组分和碳质组分的质量浓度,探讨了PM2.5污染特征,在此基础上进一步分析了PM2.5的光学特性。结果表明,采样期间PM2.5平均质量浓度为(122.6±66.9)μg/m^3,水溶性离子占PM2.5的36.0%,SO4^2−、NO3^−和NH4^+3种离子(SNA)占水溶性离子的74.7%,是邯郸市PM2.5中最主要的水溶性离子。有机碳(OC)与元素碳(EC)平均质量浓度分别为(35.6±24.0)μg/m^3和(10.4±8.0)μg/m^3,分别占PM2.5的29.2%和7.5%。重污染期间PM2.5平均质量浓度为216.3μg/m^3,是清洁时段(58.6μg/m^3)的3.7倍,且重污染期间EC、SNA和OC的质量浓度涨幅较明显。采样期间大气消光系数平均值为(780.9±439.1)Mm^-1,有机物(OM)、EC、(NH4)2SO4和NH4NO3的消光贡献依次为51.4%、12.3%、11.4%和11.3%。重污染期间大气消光系数为(1351.9±208.5)Mm^-1,EC和NH4NO3消光系数的增长幅度高于其他组分,说明邯郸市大气重污染发生时需要加强关注EC和NH4NO3。In recent years,the atmospheric environment of the North China Plain(NCP)has drawn significant attention.Handan is located in the south of the NCP and is an industrial city dominated by coal combustion.Air pollution has become a serious environment problem in Handan in recent years.To understand the formation mechanism and optical properties of major chemical components of fine particulate matter(PM2.5)under heavy pollution conditions,PM2.5 samples were collected in Handan from January 23 to January 30,2016.The mass concentrations of water-soluble inorganic ions and the carbonaceous composition were analyzed.Then,the extinction coefficient was calculated to investigate the optical properties of PM2.5.The results showed that the average concentration of PM2.5 was(122.6±66.9)μg/m^3 and that total water-soluble ions accounted for 36.0%of the PM2.5.SO4^2-,NO3^-,and NH4^+(SNA)were the dominant species of water soluble ions,which accounted for 74.7%of the total ions.The average mass concentrations of organic carbon(OC)and elemental carbon(EC)were(35.6±24.0)μg/m^3 and(10.4±8.0)μg/m^3,respectively.OC and EC accounted for 29.2%and 7.5%of the PM2.5,respectively.During a heavy pollution episode,the concentration of PM2.5 was 216.3μg/m^3,which was 3.7 times higher than that on clean days(58.6μg/m^3),and the concentrations of EC,SNA,and OC increased significantly.The average extinction coefficient of aerosol was(780.9±439.1)Mm^-1 and the extinction contributions of OM,EC,(NH4)2SO4,and NH4NO3 were 51.4%,12.3%,11.4%,and 11.3%,respectively.During heavy pollution days,the average extinction coefficient was(1351.9±208.5)Mm^-1 and the extinction coefficients of EC and NH4NO3 increased more significantly than those of other components,thereby indicating that more attention should be paid to controlling EC and NH4NO3.

关 键 词：霾 二次无机离子 消光系数 邯郸市 

分 类 号：P593[天文地球—地球化学] X831[天文地球—地质学]