Dominant factors controlling concentrations of aldehydes in rain, fog, dew water, and in the gas phase
Dominant factors controlling concentrations of aldehydes in rain, fog, dew water, and in the gas phase
复制标题
DOI：
10.1016/j.atmosenv.2005.09.009
复制
发表时间：
2005-12-01
影响因子：
5
通讯作者：
Igawa, M
中科院分区：
文献类型：
--
作者：
Matsumoto, K;Kawai, S;Igawa, M
通过对城市和郊区山区雨水、雾、露水和气相中低分子量醛类化合物的测定，分析了大气中醛类化合物在液滴和气相中的化学组成，并探讨了影响醛类化合物湿法去除的因素。露水中总醛的浓度高于雨雾水，这是由于露水的水量较小。甲醛和乙醛都被检测为气相中的主要醛。次级形成过程是主要来源的醛在郊区网站，而主要来源是相对重要的城市大气。相比之下，在雨水中，甲醛是最丰富的醛，其次是乙二醛。乙二醛被检测为最主要的醛雾和露水。乙醛没有检测到作为一个主要组成部分，在液滴中，尽管其在气相中的丰度。每种醛化合物的水溶性和水的稀释效应是控制这些醛在环境液滴中的组成和浓度的关键因素。(c)2005爱思唯尔有限公司保留所有权利。
Low-molecular weight aldehyde compounds in rain, fog, dew water, and in the gas phase were measured at urban and suburban mountain sites, to characterize the chemical composition of aldehydes in liquid droplets and in the gas phase in the ambient atmosphere, and discuss the factors controlling wet removal processes of aldehydes. Higher concentrations of total aldehydes were found in dew water than in rain and fog water due to the small amount of water volume. Both formaldehyde and acetaldehyde were detected as dominant aldehydes in the gas phase. Secondary formation processes are dominant sources for both aldehydes in the Suburban site, whereas primary Sources are relatively important for the urban atmosphere. In rainwater, by contrast, formaldehyde was the most abundant aldehyde, followed by glyoxal. Glyoxal was detected as the most dominant aldehyde in fog and dew water. Acetaldehyde was not detected as a main component in liquid droplets in spite of its abundance in the gas phase. Water solubility of each aldehyde compound and dilution effect by water are critical factors that control the compositions and concentrations of these aldehydes in ambient liquid droplets. (c) 2005 Elsevier Ltd. All rights reserved.