摘要
为研究贵阳市细颗粒物物理性质与水溶性阴离子污染特征,利用TEM-EDX、离子色谱对贵阳市冬季雾天采集的细颗粒物(PM2.5)的形态结构和水溶性阴离子特征进行分析。结果表明:贵阳市PM2.5类型多样,主要类型有硅铝酸盐/硅氧矿物、硅铝飞灰、铁氧化物颗粒、硫酸盐晶体、碳质气溶胶等,主要来源于燃煤及生物质的燃烧、机动车尾气排放等;SO2-4,NO-3和Cl-是PM2.5中水溶性阴离子的重要成分,占贵阳市PM2.5质量浓度的35.09%;NO-3和SO2-4相关性显著,说明二者形成过程的控制因子相同;[NO-3]/[SO2-4]比值小于1,表明其来源于燃煤等固定源排放为主。
To investigate the physical property of atmospheric fine particles and Water-soluble ions pollution in Guiyang,PM2. 5aerosol samples were collected during the winter fog period of Dec. 2014 to Feb. 2015. Microscopic morphology and elemental composition of PM2. 5were measured using a Transmission Electron Microscope with Energy-Dispersive Spectrometer( TEMEDX). Water-soluble ions of PM2. 5were analyzed by using Ion Chromatography. The results indicated that the particles of PM2. 5could be classified as following groups: aluminosilicate / silica minerals,fly ash with rich Si-Al,Fe-oxide particles,sulfate crystals,carbonaceous aerosols( including soot,globular organic particles and irregularly shaped carbon) which could be traced to coal,biomass burning and vehicle exhaust. Water-soluble components including SO2-4,NO3-and Cl-were important in PM2. 5of Guiyang,accounting for 35. 09% of PM2. 5. The correlation between NO-3and SO2-4was significantly positive in Winter Fog Episode,indicating their formation process in the ambient air might be subject to the same control factors. The mass ratio of [NO-3]/[SO2-4]was less than 1. The emission of fixed sources( fuel coal) was considered to be the major source of water-soluble inorganic negative ions of PM2. 5in Guiyang.
出处
《环境工程》
CAS
CSCD
北大核心
2016年第S1期512-517,528,共7页
Environmental Engineering
基金
贵阳市科技计划项目(筑科合同[2011401]社6-3号)
贵阳市科技计划项目(筑科合同[2012303]14号)
关键词
贵阳市
PM2.5
形貌类型
水溶性阴离子
Guiyang
PM2.5
microscopic morphology
water-soluble inorganic negative ions
