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作 者:田霄 谢宇琪 许博 卫昱婷 徐晗 张忠诚 冯银厂[1] 史国良[1] TIAN Xiao;XIE Yu-qi;XU Bo;WEI Yu-ting;XU Han;ZHANG Zhong-cheng;FENG Yin-chang;SHI Guo-liang(State Environmental Protection Key Laboratory of Urban Ambient Air Particulate Matter Pollution Prevention and Control,CMA-NKU Cooperative Laboratory for Atmospheric Environment-Health Research,College of Environmental Science and Engineering,Nankai University,Tianjin 300350,China;Taiyuan Ecological Environment Bureau,Taiyuan 030002,China)
机构地区:[1]南开大学环境科学与工程学院,国家环境保护城市空气颗粒物污染防治重点实验室,CMA-NKU大气环境与健康研究合作实验室,天津300350 [2]太原市生态环境局,山西太原030002
出 处:《中国环境科学》2023年第6期2755-2762,共8页China Environmental Science
基 金:中央高校基本科研业务费专项(63233054);国家自然科学基金资助项目(42077191);天津市科技计划项目(18PTZWHZ00120);中国工程院院地合作项目(2020C0-0002)。
摘 要:2019年11月~2020年12月,从太原市8个监测站点采集的大气降尘样品,进行化学组分和粒径分析,研究了降尘化学组分及降尘来源的粒径分布特征.研究结果表明:首先,太原市降尘的粒径大小受地理位置影响显著,呈现南部粒径大,北部粒径小的特点,且呈现秋冬季粒径偏大的季节特点,这与太原市降尘污染源的时空分布有关.此外,不同粒径大小降尘的化学组分存在明显的时空差异,尤其是OC、SO_(4)^(2-)和无机元素Ca、Si和Fe等组分.源解析结果表明城市扬尘源对太原市各粒径大小降尘样品的贡献均较高(33.7%~37.5%).同时,建筑尘源(21.8%~31.6%)和钢铁工业源(5.1%~18.1%)对中粒径和粗粒径降尘具有显著贡献,燃煤源对细粒径降尘的影响也不可忽视(14.1%~22.6%).This study collected dustfall samples at 8 monitoring stations in Taiyuan from November 2019 to December 2020 and analyzed their chemical compositions,size distributions,and source characteristics.The key results are shown as follows.First,the particle size of dustfall was significantly affected by the sampling area,larger at the southern stations and smaller at northern stations.The particle size was also generally larger in autumn and winter,linked to the spatial-temporal characteristics of the dustfall sources in Taiyuan.In addition,the chemical components of dustfall with different particle sizes were obviously different in various spatial-temporal conditions,especially for OC,SO_(4)^(2-)and inorganic elements such as Ca,Si,Fe,etc.According to the results from the receptor models,urban dust contributed greater to dustfall with different sizes in Taiyuan(33.7%~37.5%).Meanwhile,construction dust(21.8%~31.6%)and steel industry(5.1%~18.1%)contributed significantly to medium and large particle size dustfall.The influence of coal combustion(14.1%~22.6%)to small size dustfall could not be ignored.
分 类 号:X513[环境科学与工程—环境工程]
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