| 摘要: |
| 采用单颗粒气溶胶飞行时间质谱仪（Single Particle Aerosol Mass Spectrometer，SPAMS）对西安市大气矿尘颗粒物进行连续12 d在线分析，共采集到107 425个同时含有正负质谱信息的矿尘颗粒，矿尘颗粒物占PM2.5样本数的8.44％。结果表明，矿尘颗粒物的正离子碎片成分以Na+、K+、Al+、Ca+、CaO+、Fe+为主，同时还含有Pb+等，负离子碎片成分以NO-2和NO-3为主，另外还含有HSO-4、SiO-3、HSiO-3、H（NO3）-2等。在西安市大气细颗粒物中，矿尘颗粒物中贡献较大的几类（如含钙、含铁、铁氧颗粒物等）大多是老化的成分。将观测阶段采集到的矿尘颗粒纳入本地污染源谱进行来源分析，其主要来源为扬尘源、工业源、燃煤源和汽车尾气源等。 |
| 关键词: 单颗粒气溶胶质谱仪 矿尘颗粒 粒径和化成成分 污染特征 秋季 西安 |
| DOI： |
| 分类号:X513 |
| 文献标识码:B |
| 基金项目: |
|
| Study on the Pollution Characteristics of Mineral Dust Particle in PM2.5 in the North Area of Xian in Autumn |
|
MOU Guotao， LIU Huanwu， LI Wentao， WANG Fan， WANG Yixiao1,2
|
|
1. School of Environmental and Municipal Engineering，Xian University of Architecture and Technology，Xian， Shanxi 710055，China;2. Xian Environmental Monitoring Station，Xian ，Shanxi 710002，China
|
| Abstract: |
| On-line Single Particle Aerosol Mass Spectrometer （SPAMS） was used to analysis the mineral dust particle in Xian， and the chemical composition of the mineral dust aerosol particles were detected. During twelve days of consecutive days sampling， 107 425 particles in both positive and negative spectra were detected， in which mineral dust particles accounted for 8.44%. The results showed that among these mineral dust particles， the positive composition ions were mainly Na+、K+、Al+、Ca+、CaO+，Fe+， and Pb+. The negative composition ions were mainly NO-2and NO-3， as well asHSO-4、SiO-3、HSiO-3、H（NO3）-2 and others．At the same time， it was observed that most of the mineral dust particles （such as Ca-rich， Fe-rich， Fe&O-rich） were aged ingredients．The mineral dust particles collected during observation were brought into the local pollution source spectrum analysis ， and the result showed that dust sources， industrial sources， coal source and automobile exhaust gas source were the main sources of the mineral dust aerosol particles . |
| Key words: Single particle aerosol mass spectrometer（SPAMS） Mineral dust particles Size and chemical compositions Pollution characteristics Autumn Xian |
