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北京西三环地区不同粒径大气颗粒物中有机脂肪酸的污染特性

何 翔 钱 枫 李 峣

何 翔, 钱 枫, 李 峣. 北京西三环地区不同粒径大气颗粒物中有机脂肪酸的污染特性[J]. 环境科学研究, 2013, 26(9): 942-947.
引用本文: 何 翔, 钱 枫, 李 峣. 北京西三环地区不同粒径大气颗粒物中有机脂肪酸的污染特性[J]. 环境科学研究, 2013, 26(9): 942-947.
HE Xiang, QIAN Feng, LI Yao. Distribution Characteristics of Organic Aliphatic Acids in Airborne Particles with Different Sizes in the Area of the 3rd West Ring Road in Beijing City[J]. Research of Environmental Sciences, 2013, 26(9): 942-947.
Citation: HE Xiang, QIAN Feng, LI Yao. Distribution Characteristics of Organic Aliphatic Acids in Airborne Particles with Different Sizes in the Area of the 3rd West Ring Road in Beijing City[J]. Research of Environmental Sciences, 2013, 26(9): 942-947.

北京西三环地区不同粒径大气颗粒物中有机脂肪酸的污染特性

基金项目: 北京市重点学科建设项目(PXM2012_014213_000042);北京市学科与研究生教育创新平台建设项目(PXM2012_014213_000063)

Distribution Characteristics of Organic Aliphatic Acids in Airborne Particles with Different Sizes in the Area of the 3rd West Ring Road in Beijing City

  • 摘要: 年1—7月在北京市西三环航天桥地区,用大流量分级采样器分5级采集大气颗粒物样品,采用溶剂提取和衍生化方法对样品进行前处理,利用GC-MS分析不同粒径颗粒物中的有机脂肪酸. 结果表明:在颗粒物中共检出21种MOA(一元有机脂肪酸)和7种DIA(二元有机脂肪酸);ρ(∑21MOA)(21种MOA总质量浓度)和ρ(∑7DIA)(7种DIA总质量浓度)均在粒径<0.69μm的超细颗粒中最高,分别约占各自5级颗粒物质量浓度总和的30.0%和32.5%;颗粒物中ρ(∑21MOA)和ρ(∑7DIA)月际变化规律不同,前者在1—2月最高,3月次之;而后者在5—7月最高. MOA和DIA的组成、分布特点亦不尽相同,其中C10~C24的MOA表现出明显的偶数碳优势,而DIA没有显现奇偶优势;MOA中ρ(C16-MOA)最高,ρ(C18-MOA)次之;DIA中ρ(壬二酸)最高. 基于MOA的C18/C16〔ρ(C18-MOA)/ρ(C16-MOA)〕和CPI(碳优先指数)分析表明,颗粒物中MOA主要来自人为源,与燃煤排放、机动车尾气及烹调排放相关,1—2月燃煤排放对颗粒物中MOA的贡献明显.

     

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出版历程
  • 收稿日期:  2013-02-01
  • 修回日期:  2013-05-31
  • 刊出日期:  2013-09-25

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