期刊论文

Concentration changes and characteristics of atmospheric carbon particulates in Lhasa

中文

环境化学

0254-6108

2020

39

4

911-919

10.7524/j.issn.0254-6108.2019092205

11775180:国家自然科学基金 11705267:国家自然科学基金 YX2019007:中国科学院上海应用物理研究所育新计划项目

本校为第一机构

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3.0-7.2μm粒径段(11-12月);EC主要分布在＜0.49μm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.

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 th...