|
|||||
|
|
| 西安冬季不同空气质量级别对应的PM_(2.5)化学组分变化特征 | |
| 引用本文： | 徐红梅,曹军骥,沈振兴,刘随心,张婷,周家茂. 西安冬季不同空气质量级别对应的PM_(2.5)化学组分变化特征[J]. 科技导报(北京), 2015, 33(6): 31-36. DOI: 10.3981/j.issn.1000-7857.2015.06.004 |
| 作者姓名： | 徐红梅 曹军骥 沈振兴 刘随心 张婷 周家茂 |
| 作者单位： | 1. 西安交通大学环境科学与工程系, 西安710049; 2. 中国科学院地球环境研究所气溶胶化学与物理重点实验室, 西安710061; 3. 西安交通大学全球环境变化研究院, 西安710049 |
| 基金项目： | 国家自然科学基金面上项目(41275168);中央高校基本科研业务费专项(XJJ2015035);西安交通大学新教师科研支持计划项目(XJTUHRT-002) |
| 摘 要： | 通过实验采样分析,研究了西安市冬季不同空气质量级别(HJ 633—2012)下PM2.5质量浓度及化学组分的变化特征和污染规律。结果表明,西安市2008—2009年冬季所有采样天均为轻度污染到严重污染状况,PM2.5质量浓度100%未达标(GB3095—2012);PM2.5质量浓度及其化学组分基本随空气质量级别恶化而增加,除个别元素外,其他化学组分的质量浓度在严重污染时均出现突增,有机碳(4.5倍)和水溶性无机离子(2.7倍)的增加倍数较大;随大气污染程度的增加,人为源的重金属富集因子增加剧烈(1.6~2.0倍),而主要来自自然源的元素富集因子变化无规律;重污染时期PM2.5中的多环芳烃(PAHs)、正构烷烃(nalkanes)均主要来自人为源排放贡献,其中生物质燃烧、低温燃煤排放是PAHs剧增的主要因素。 |
| 关 键 词： | PM2.5 化学组分 多环芳烃 正构烷烃 空气质量级别 |
Characterization of chemical composition for fine particle matter collected in different air quality grades in Xi'an in winter |
|
| XU Hongmei,CAO Junji,SHEN Zhenxing,LIU Suixin,ZHANG Ting,ZHOU Jiamao. Characterization of chemical composition for fine particle matter collected in different air quality grades in Xi'an in winter[J]. Science & Technology Review, 2015, 33(6): 31-36. DOI: 10.3981/j.issn.1000-7857.2015.06.004 | |
| Authors: | XU Hongmei CAO Junji SHEN Zhenxing LIU Suixin ZHANG Ting ZHOU Jiamao |
| Affiliation: | 1. Department of Environmental Science and Engineering, Xi'an Jiaotong University, Xi'an 710049, China; 2. Key Lab of Aerosol Chemistry & Physics, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710061, China; 3. Institute of Global Environmental Change, Xi'an Jiaotong University, Xi'an 710049, China |
| Abstract: | The ambient fine particle matters (PM2.5) were collected from November 2008 till March 2009 (wintertime) in an urban site of Xi'an to compare with the chemical compositions according to the air quality grades guidelines (HJ 633-2012). All of PM2.5 mass concentrations were in excess of the 75 μg/m3 level in the 24 h Ambient Air Quality Standards (GB 3095-2012). The concentrations of PM2.5 mass and their corresponding chemical compositions were elevated to show a generally increasing trend of the AQI except for a few elements. The concentrations of organic carbon (OC) and water-soluble inorganic ions on six-grade days were approximately 4.5 and 2.7 times those of three-grade days. The enrichment factors of anthropogenic elements (e.g., As, Zn and Pb) on six-grade days were 1.6-2.0 times those of three-grade days, while the elements from crustal sources were not observed along with any surge and rule of air pollution levels. PAHs and n-alkanes mainly were contributed by anthropogenic sources. During the occurrence of heavy air pollution in winter, biomass burning and coal combustion emissions showed a larger contribution to PAHs than gasoline vehicle emissions. |
| Keywords: | |
| 本文献已被 CNKI 等数据库收录！ | |
| 点击此处可从《科技导报(北京)》浏览原始摘要信息 | |
| 点击此处可从《科技导报(北京)》下载全文 | |
