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拉萨市大气中碳颗粒物的浓度变化及特征

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李婧琳, 曾友石, 刘卫, 姚剑, 位楠楠, 单健. 拉萨市大气中碳颗粒物的浓度变化及特征[J]. 环境化学, 2020, (4): 911-919. doi: 10.7524/j.issn.0254-6108.2019092205
引用本文: 李婧琳, 曾友石, 刘卫, 姚剑, 位楠楠, 单健. 拉萨市大气中碳颗粒物的浓度变化及特征[J]. 环境化学, 2020, (4): 911-919. doi: 10.7524/j.issn.0254-6108.2019092205
shu
LI Jinglin, ZENG Youshi, LIU Wei, YAO Jian, WEI Nannan, SHAN Jian. Concentration changes and characteristics of atmospheric carbon particulates in Lhasa[J]. Environmental Chemistry, 2020, (4): 911-919. doi: 10.7524/j.issn.0254-6108.2019092205
Citation: LI Jinglin, ZENG Youshi, LIU Wei, YAO Jian, WEI Nannan, SHAN Jian. Concentration changes and characteristics of atmospheric carbon particulates in Lhasa[J]. Environmental Chemistry, 2020, (4): 911-919. doi: 10.7524/j.issn.0254-6108.2019092205
shu

拉萨市大气中碳颗粒物的浓度变化及特征

  • 1. 南华大学核科学技术学院, 衡阳, 421001;

  • 2. 中国科学院上海应用物理研究所, 上海, 201800

    • 通讯作者: 单健, E-mail: shanjian0666@163.com
  • 基金项目:

    国家自然科学基金（11775180，11705267）和中国科学院上海应用物理研究所育新计划（YX2019007）资助.

Concentration changes and characteristics of atmospheric carbon particulates in Lhasa

  • 1. School of Nuclear Science and Technology, University of South China, Hengyang, 421001, China;

  • 2. Key Laboratory of Nuclear Analysis and Nuclear Energy Technology, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, 201800, China

    • Corresponding author: SHAN Jian, shanjian0666@163.com
  • Fund Project: Supported by the Natural Science Foundation of China(11775180, 11705267)and the Foster Talent Project of Shanghai Institute of Applied Physics, Chinese Academy of Science(YX2019007).

  • 摘要: 利用STAPLEX大流量分级采样器于2014年8—12月采集拉萨市城区大气颗粒物84个样品，测定不同粒径上有机碳（OC）和元素碳（EC）的质量浓度，定性分析二次有机碳（SOC），基于碳质组分和14C值得到其来源.结果表明，不同粒径的OC质量浓度呈双峰分布，较高峰出现在<0.49 μm粒径段，次高峰出现在1.5—3.0 μm粒径段（8—9月）和3.0—7.2 μm粒径段（11—12月）；EC主要分布在<0.49 μm粒径段.OC/EC比值为4.15—33.80，表明拉萨大气颗粒物存在二次有机碳.研究表明，拉萨市碳质颗粒物的主要污染源是燃煤、机动车尾气、生物质燃烧和地面扬尘、生物质燃烧和地面扬尘是OC的主要来源，燃煤和机动车尾气则是EC的主要来源.
    Abstract: Based on carbonaceous components and 14C value, the pollution characteristics and sources of carbonaceous aerosols in Lhasa were investigated through the measurement of mass concentration of size-segregated organic carbon (OC), element carbon (EC) and secondary organic carbon (SOC). 84 samples of atmospheric aerosols in urban area of Lhasa were collected from August to December 2014 by STAPLEX large-flow grading sampler. Two peak values were obtained from mass concentration of size-segregated OC.The highest level of OC mass concentration appeared in the particulate matter smaller than 0.49 μm, and the second highest one existed in the particulate matter with the size ranging from 1.5 to 3.0 μm (in August and September) and from 3.0 to 7.2 μm (in November to December). EC was mainly distributed in the particulate matter smaller than 0.49 μm. The ratio between OC and EC (4.15—33.80) indicated the existence of secondary pollution. The research shows that the main sources of pollution of carbonaceous particulate matter in Lhasa are coal burning, motor vehicle exhaust, biomass combustion and soil dust. Biomass combustion and soil dust are the main sources of OC; while coal and motor vehicle exhaust are the main sources of EC.
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  • 收稿日期:  2019-09-22

拉萨市大气中碳颗粒物的浓度变化及特征

    通讯作者: 单健, E-mail: shanjian0666@163.com
  • 1. 南华大学核科学技术学院, 衡阳, 421001;
  • 2. 中国科学院上海应用物理研究所, 上海, 201800
  • 收稿日期:  2019-09-22
基金项目:

国家自然科学基金（11775180，11705267）和中国科学院上海应用物理研究所育新计划（YX2019007）资助.

摘要: 利用STAPLEX大流量分级采样器于2014年8—12月采集拉萨市城区大气颗粒物84个样品，测定不同粒径上有机碳（OC）和元素碳（EC）的质量浓度，定性分析二次有机碳（SOC），基于碳质组分和14C值得到其来源.结果表明，不同粒径的OC质量浓度呈双峰分布，较高峰出现在<0.49 μm粒径段，次高峰出现在1.5—3.0 μm粒径段（8—9月）和3.0—7.2 μm粒径段（11—12月）；EC主要分布在<0.49 μm粒径段.OC/EC比值为4.15—33.80，表明拉萨大气颗粒物存在二次有机碳.研究表明，拉萨市碳质颗粒物的主要污染源是燃煤、机动车尾气、生物质燃烧和地面扬尘、生物质燃烧和地面扬尘是OC的主要来源，燃煤和机动车尾气则是EC的主要来源.

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