Seasonal and diurnal variations of carbonyl compounds in Beijing ambient air
Seasonal and diurnal variations of carbonyl compounds in Beijing ambient air
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北京环境空气中羰基化合物的季节和日变化
DOI：
10.1016/j.atmosenv.2006.05.044
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发表时间：
2006-10-01
影响因子：
5
通讯作者：
Mu, Yujing
中科院分区：
文献类型：
--
作者：
Pang, Xiaobing;Mu, Yujing
2004年11月至2005年10月对北京市大气中羰基化合物进行了监测。甲醛，乙醛和丙酮被认为是最丰富的羰基。甲醛、乙醛和丙酮的浓度分别从冬季的5.14 +/- 2.56、8.68 +/- 3.48、9.18 +/- 3.27 μ g m（-3）增加到夏季的19.51 +/- 6.34、17.18 +/- 4.57、22.14 +/- 5.98 μ g m（-3）。夏季羰基化合物与臭氧相关性较好，冬季羰基化合物与CO相关性较强，说明夏季羰基化合物主要来源于VOCs的光氧化，冬季主要来源于机动车尾气。根据当地天顶角计算的低羰基化合物的光解速率夏季比冬季大一个数量级。从350个样品的数据库中分析了羰基化合物的分布频率。甲醛、乙醛和丙酮的最高频率浓度分别为9.0-19.0、5.0-15.0和13.0-23.0 μ g·m ~（-3）。(c)2006爱思唯尔有限公司保留所有权利。
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.