王志娟;韩力慧;陈旭锋;程水源;李悦;田川;谢慧;

• 1:北京工业大学环境与能源学院
• 2:唐山市环境监测中心站

摘要(Abstract)：

通过采集北京2010年12月—2011年3月冬春季节大气细颗粒物PM.25样品,分析了冬春季典型污染时段灰霾和沙尘期间大气细颗粒物PM.25的质量浓度和其中元素、水溶性离子、有机组分OC和EC特性,及其季节变化和来源。结果表明,北京灰霾和沙尘期间PM2.5日均质量浓度分别高达301.8μg/m3和284.8μg/m3,是美国EPAPM2.5日均质量浓度限值(35μg/m3)的8.62倍和8.14倍。灰霾时段,人为污染元素(S、Cu、Zn、As、Se、Cd、Sb、Pb)、二次无机离子(NH4+、NO3-、SO24-)和二次有机碳(SOC)的质量浓度均高于沙尘天气和非污染天气。沙尘天气时地壳元素(Na、Mg、Al、Ca、Fe等)的质量浓度高于灰霾天气和非污染天气。北京冬春季节PM2.5主要来源于燃煤和工业过程、二次转化、地面扬尘、机动车尾气和生物质燃烧。灰霾污染时段二次转化贡献率较高,沙尘污染时段地面扬尘贡献率较高。

关键词(KeyWords)： 环境学;灰霾;沙尘;细颗粒物;特性;二次转化;来源

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金重点项目(51038001);; 国家环保部公益性行业科研专项(200909008);; 北京市科技新星计划B类项目(2009B07)

作者(Authors): 王志娟;韩力慧;陈旭锋;程水源;李悦;田川;谢慧;

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