收藏本站
收藏 | 手机打开
二维码
手机客户端打开本文

Chemical Composition and Size Distribution of Airborne Particulate Water-Soluble Species in Xi'an,Central China during Spring 2009:Implications for Heterogeneous Reactions of Anthropogenic Pollutants with Mineral Dust

【摘要】:PM10 and size-resolved (9-stage) aerosol samples in the urban air of Xi'an, China were collected during the spring of 2009 including a massive dust storm occurring on April 24th and measured for inorganic ions, water-soluble organic (WSOC) and inorganic carbon (WSIC), water-soluble organic nitrogen (WSON), EC and OC. Characteristics of chemical compositions and size-distributions of those measured species in the urban samples were investigated and further compared with those simultaneously observed on the mountaintop of Mt. Hua, which is located about 150 km east to the city, to recognize the impact of dust storm on aerosol chemistry of the downwind region. PM10 in Xi'an during the non-dust storm period ranged from 58-420 g m-3 (257±79 g m-3), and sharply increased to a 3-hr maximum of 890 g m-3 (av. 589±273 g m-3) on the dust storm day (April 24th). Mass-closure study results showed that during the non-dust storm period organic matters accounted for 25% of the PM10 particle mass, followed by SO42- (13%), NO3- (10%), water-soluble carbonate (10%), EC (5%), NH4+ (4%), and other ions (7%). In contrast, water-soluble carbonate became the most abundant among the measured species during the dust storm period, accounting for 12% of the PM10 mass, followed by organic matters (11%), SO42- (3%), Ca2+(2%) and NO3- (1.5%). Such a changes in chemical compositions suggests a significant heterogeneous reaction of acidic gases (e.g., H2SO4, HNO3, SO2 and N2O5) with dust to form water-soluble mineral compounds. A bimodal size distribution of particles was observed during the non-dust time with two equivalent peaks in the fine (2.1 m) and coarse (2.1 m) ranges, in contrast to a unimodal pattern (i.e., coarse mode) observed on the dusty day. All the measured ions except NH4+ significant shifted toward larger particles during the dust storm time. Similar size-distribution patterns of particles were found on the mountaintop of Mt. Hua, which are bimodal during the non-dust period and unimodal during the dust period. However, Cl- and NO3- presented a different size distribution between the urban and the mountaintop atmospheres. Cl- showed a bimodal pattern in the urban area during the whole sampling periods with an increased coarse mode during the dusty day, in contrast to a unimodal coarse mode observed at the mountaintop in either the non-dust or the dust periods, which is most likely caused by heterogeneous reactions of sulfuric and/or nitric acids with chloride-containing compounds (e.g., KCl) during the long-range transport of biomass burning emissions from lowland regions to the mountaintop. NO3-presented a bimodal pattern in the urban air with a dominant peak in the fine mode during the non-dust period and two equivalent peaks in the fine and coarse ranges during the dust storm period. Whereas in the mountain atmosphere NO3- presented two equivalent peaks in the fine and coarse modes on the non-dust storm days and a unimodal coarse mode on the dust storm day. Such a difference can be explained by an evaporation of HNO3 from the fine mode particles and a subsequent re-adsorption onto alkaline coarse particles, which was more significant at the mountaintop during the dust-storm period.

知网文化
【相似文献】
中国重要会议论文全文数据库 前10条
1 丁锋;;Large-scale traveling ionospheric disturbances observed by GPS total electron content during the magnetic storm of 29-30 October 2003[A];中国科学院地质与地球物理研究所2007学术论文汇编(第一卷)[C];2008年
2 ;Chemical Composition and Size Distribution of Airborne Particulate Water-Soluble Species in Xi'an,Central China during Spring 2009:Implications for Heterogeneous Reactions of Anthropogenic Pollutants with Mineral Dust[A];第八届海峡两岸气溶胶技术研讨会暨第三届空气污染技术研讨会论文摘要集[C];2011年
3 E.L.Afraimovich;S.V.Voeykov;N.P.Perevalova;;A statistical study of large-scale traveling ionospheric disturbances observed by GPS TEC during major magnetic storms over the years 2003-2005[A];中国科学院地质与地球物理研究所2008学术论文汇编[C];2009年
4 K.Tschu;K.Igarashi;T.Kikuchi;K.Nozaki;S.Watari;L.J.Paxton;Harold P.Bulanon;;Ionosphere disturbances observed throughout Southeast Asia of the superstorm of 20-22 November 2003[A];中国科学院地质与地球物理研究所2008学术论文汇编[C];2009年
5 Chung-Te Lee;Ming-Tung Chuang;Neng-Huei Lin;Guey-Rong Sheu;Shuenn-Chin Chang;Sheng-Hsiang Wang;Hill Huang;Horng-Wen Chen;Guo-Hau Weng;Hsin-YoLai;Shao-Peng Hsu;;Characteristics of PM_(2.5) mass and water-soluble ions during Background and biomass burning periods observed at Mt.Lulin in Taiwan from 2003 to 2009[A];第七届海峡两岸气胶技术研讨会暨第二届空气污染技术研讨会论文摘要集[C];2010年
6 ;Geomagnetic response in high latitudes during the stormon July 15-16,2000[A];中国科学院地质与地球物理研究所2002学术论文摘要汇编[C];2002年
7 Andrew Carr;;Managing Co-morbidities and Side Effects during Long-term ART[A];中华医学会第五次全国艾滋病、病毒性丙型肝炎暨全国热带病学术会议论文汇编[C];2011年
8 ;Climatology of medium-scale traveling ionospheric disturbances observed by a GPS network in central China[A];中国科学院地质与地球物理研究所第11届(2011年度)学术年会论文集(中)[C];2012年
9 张翼;;Radiation Exposure to Patients during Interventional Radiology Procedures:A Comprehensive Analysis[A];2010中华医学会影像技术分会第十八次全国学术大会论文集[C];2010年
10 冯智英;徐晓;祝胜美;郑树森;;Effects of Low Central Venous Pressure during Preanhepatic Phase on Blood Loss,Liver and Renal Function in Liver Tansplantation[A];第十五次长江流域麻醉学学术年会暨2010年中南六省麻醉学学术年会暨2010年湖北省麻醉学学术年会论文集[C];2010年
中国博士学位论文全文数据库 前10条
1 MUHAMMAD FAROOQ IQBAL;[D];南京农业大学;2009年
2 胡石琼;细胞附着的力学和动力学[D];华东师范大学;2011年
3 Waseem Raza;[D];南京农业大学;2009年
4 李田;植物冷胁迫早期响应蛋白的分离鉴定及相关功能的研究[D];兰州大学;2010年
5 萨伊德;碳纳米纤维支架与兔脂肪干细胞的体外相容性研究[D];华中科技大学;2011年
6 唐勇;[D];广西医科大学;2010年
7 白德尔;[D];上海体育学院;2010年
8 刘召;脐橙螟蛾对植物源挥发气味物质的感受机制[D];西北农林科技大学;2011年
9 Sehroon Khan;几种昆虫 病原真菌抗蚜虫活性分析及其功能蛋白的研究[D];中国农业科学院;2012年
10 Muhammad Farooq Hussain Munis;[D];华中农业大学;2010年
中国硕士学位论文全文数据库 前10条
1 杨艳丽;[D];陕西师范大学;2011年
2 Truong Ngoc Tu;张玉秀;[D];华东理工大学;2011年
3 TOURE Facinet(法西内);HIF-1α和P-gp在胰腺癌中的表达及其临床病理意义[D];中南大学;2011年
4 Murtaza Habib;[D];哈尔滨工程大学;2010年
5 袁淑雷;兼顾降低冲击度和减小滑磨功的DCT换挡控制研究[D];上海交通大学;2012年
6 毛利斯;发酵法生产腺苷的培养基优化[D];华东理工大学;2010年
7 Rebecca Simisola Agboola;硼(B)和氯化钠胁迫处理诱导高粱(Sorghum bicolor)自交系发生形态和DNA甲基化的变异[D];东北师范大学;2010年
8 张弘;小鼠囊胚与黑色素瘤细胞体外共培养模型优化[D];重庆医科大学;2010年
9 Eman;湖北汉族人PPARγ2基因Pro12Ala和C161T多态与肥胖的遗传关联研究[D];华中师范大学;2012年
10 刘其耸;张裕白兰地蒸馏过程香气物质变化规律研究[D];烟台大学;2011年
中国重要报纸全文数据库 前2条
1 易水;新词集锦[N];计算机世界;2002年
2 张莹;Inventory shrinkage[N];中国财经报;2002年
中国知网广告投放
 快捷付款方式  订购知网充值卡  订购热线  帮助中心
  • 400-819-9993
  • 010-62982499
  • 010-62783978