Seasonal and diurnal variations of carbonyl compounds in Beijing ambient air

被引：168

作者：

Pang, Xiaobing ^{[1
]}

Mu, Yujing ^{[1
]}

机构：

[1] Chinese Acad Sci, State Key Lab Environm Chem & Ecotoxicol, Res Ctr Ecoenvironm Sci, Beijing 100085, Peoples R China

来源：

ATMOSPHERIC ENVIRONMENT | 2006年 / 40卷 / 33期

基金：

中国国家自然科学基金;

关键词：

carbonyl compounds; photo-oxidation; vehicular exhaust; ozone;

D O I：

10.1016/j.atmosenv.2006.05.044

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

The levels of carbonyl compounds in Beijing ambient air were measured from November 2004 to October 2005. Formaldehyde, acetaldehyde and acetone were found to be the most abundant carbonyls. The concentrations of formaldehyde, acetaldehyde and acetone increased to 19.51 +/- 6.34, 17.18 +/- 4.57, 22.14 +/- 5.98 mu g m(-3), respectively, in summer from 5.14 +/- 2.56, 8.68 +/- 3.48, 9.18 +/- 3.27 mu g m(-3) in winter. Carbonyls showed excellent correlations with ozone in summer and significant correlations with CO in winter, which indicated that the sources of carbonyls were dominated by photo-oxidation of VOCs in summer and vehicular exhaust in winter. The photolysis rates of lower carbonyls calculated based on local zenith angle were one magnitude greater in summer than in winter. The distribution frequencies of carbonyls were analyzed from a database including 350 samples. The concentrations of the highest frequency were 9.0-19.0, 5.0-15.0 and 13.0-23.0 mu g m(-3) for formaldehyde, acetaldehyde and acetone, respectively. (c) 2006 Elsevier Ltd. All rights reserved.

引用

页码：6313 / 6320

页数：8

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