Effect of chemical composition of PM2.5 on visibility in Guangzhou, China, 2007 spring
Effect of chemical composition of PM2.5 on visibility in Guangzhou, China, 2007 spring
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DOI：
10.1016/j.partic.2008.11.002
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发表时间：
2009-02-01
期刊：
影响因子：
3.5
通讯作者：
Xu, Zhencheng
中科院分区：
文献类型：
--
作者：
Tao, Jun;Ho, Kin-Fai;Xu, Zhencheng
本研究的目的是调查广州市能见度与 PM2.5 化学成分的相关性。 2007年4月，广州市区华南环境科学研究所监测站每天采集28个PM2.5样本。测定 PM2.5 样品的水溶性离子种类（Cl-、NO3-、SO42-、NH4+、K+、Na+、Ca2+ 和 Mg2+）和碳含量（OC 和 EC），以表征其对能见度损害的影响。结果表明，硫酸盐是影响光散射和能见度的主要物质。能见度降低物质对光散射系数的平均贡献百分比为：硫酸盐 40%、硝酸盐 16%、有机物 22%、元素碳 22%。由于硫酸盐对能见度的影响最为显着，PM2.5中硫酸盐的减少将有效提高广州的能见度。 (C) 2008 中国颗粒学会、中国科学院过程工程研究所。由 Elsevier B.V. 出版。保留所有权利。
The object of this study was to investigate the correlation of visibility with chemical composition Of PM2.5 in Guangzhou. In April 2007, 28 PM2.5 samples were collected daily at the monitoring station of the South China Institute of Environmental Sciences (SCIES), in urban Guangzhou. Water-soluble ionic species (Cl-, NO3-, SO42-, NH4+, K+, Na+, Ca2+, and Mg2+,) and carbonaceous contents (OC and EC) of the PM2.5 samples were determined to characterize their impact on visibility impairment. The results showed that sulfate was the dominant species that affected both light scattering and visibility. The average percentage contributions of the visibility-degrading species to light scattering coefficient were 40% for sulfate, 16% for nitrate, 22% for organics, and 22% for elemental carbon. Because of its foremost effect on visibility, sulfate reduction in PM2.5 would effectively improve the visibility of Guangzhou. (C) 2008 Chinese Society of Particuology and Institute of Process Engineering, Chinese Academy of Sciences. Published by Elsevier B.V. All rights reserved.