Multiple sulfur and oxygen isotope compositions in Beijing aerosol
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- 作者：ZhaoBing Guo (1) (2)
MengLong Wu (1) (2)
FengLing Liu (1) (2)
Ying Wei (1) (2)
DongFang Li (1) (2) - 关键词：Beijing aerosol ; multiple sulfur isotope ; oxygen isotope ; mass ; independent fractionation
- 刊名：Science China Earth Sciences
- 出版年：2014
- 出版时间：November 2014
- 年：2014
- 卷：57
- 期：11
- 页码：2671-2675
- 全文大小：491 KB
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MengLong Wu (1) (2)
FengLing Liu (1) (2)
Ying Wei (1) (2)
DongFang Li (1) (2)
1. School of Environmental Science and Engineering, Nanjing University of Information Science & Technology, Nanjing, 210044, China
2. Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, Nanjing, 210044, China - ISSN：1869-1897
文摘
Multiple sulfur isotopes (32S, 33S, 34S, 36S) and oxygen isotopes (16O, 18O) in Beijing aerosols were measured with MAT-253 isotope mass spectrometer. The δ 34S values of Beijing aerosol samples range from 1.68-to 12.57-with an average value of 5.86- indicating that the major sulfur source is from direct emission during coal combustion. The δ 18O values vary from ?.29-to 9.02-with an average value of 5.17- revealing that the sulfate in Beijing aerosols is mainly composed of the secondary sulfate. The main heterogeneous oxidation of SO2 in atmosphere is related to H2O2 in July and August, whereas H2O2 oxidation and Fe3+ catalytic oxidation with SO2 exist simultaneously in September and October. Remarkable sulfur isotope mass-independent fractionation effect is found in Beijing aerosols, which is commonly attributed to the photochemical oxidation of SO2 in the stratosphere. In addition, thermochemical reactions of sulfur-bearing compounds might be also a source of sulfur isotope anomalies based on the correlation between Δ33S and CAPE.