Chemical composition of fine aerosol measured by AMS at Fukue Island, Japan during APEX period
Chemical composition of fine aerosol measured by AMS at Fukue Island, Japan during APEX period
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DOI：
10.1016/j.atmosenv.2005.04.038
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发表时间：
2005-09-01
影响因子：
5
通讯作者：
Hatakeyama, S
中科院分区：
文献类型：
--
作者：
Takami, A;Miyoshi, T;Hatakeyama, S
利用Aerodyne气溶胶质谱仪(AMS)对2003年春季日本福岛大气气溶胶的粒度分布和化学成分进行了分析。氨氮、硝酸盐、硫酸盐、三氯化物和有机物的平均浓度分别为1.57、0.56、4.80、0.07和5.03 mgm-3。粒度分布表明，在整个观察期内，氨氮、硫酸盐和有机物的形态都在400-700 nm左右，只有少数情况例外，表明这些物种是内部混合的。氨和硫酸盐的平均当量比为0.88，这意味着气溶胶呈微酸性。当气团来自中国和韩国，气溶胶浓度较高时(3月25-27日和4月6-7日)，细颗粒物中存在硝酸盐，其中含有铵和硫酸盐。有机质与硫酸盐的平均比值为1.05，说明有机质在该区的贡献不容忽视。质谱图显示有机碎片中的最大信号为m/z=44，这表明有机物种被氧化得很好。(C)2005爱思唯尔有限公司。保留所有权利。
The size distribution and chemical composition of ambient aerosols was analyzed using an Aerodyne aerosol mass spectrometer (AMS) at Fukue, Japan in the spring of 2003. The average concentration of ammonium, nitrate, sulfate, 3 chloride and organics was 1.57, 0.56, 4.80, 0.07 and 5.03 mu g m(-3), respectively. The size distribution showed that the modes of ammonium, sulfate and organics were all about 400-700 nm throughout the entire observation period with the exception of a few cases, indicating that these species were internally mixed. The average equivalent ratio of ammonium to sulfate was 0.88, which means that the aerosol was slightly acidic. When air masses came from China and Korea with high aerosol concentration (25-27 March and 6-7 April), nitrate was found in fine particles with ammonium and sulfate. The average ratio of organics to sulfate was 1.05, indicating that the contribution of organics is not negligible in this region. Mass spectra showed that the largest signal in organic fragments was m/z = 44, which shows that organic species are well-oxygenated. (c) 2005 Elsevier Ltd. All rights reserved.