Multiple sulfur and oxygen isotope compositions in Beijing aerosol  

作　　者：GUO ZhaoBing WU MengLong LIU FengLing WEI Ying LI DongFang 

机构地区：[1]School of Environmental Science and Engineering, Nanjing University of Information Science & Technology [2]Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control

出　　处：《Science China Earth Sciences》2014年第11期2671-2675,共5页中国科学（地球科学英文版）

基　　金：supported by National Natural Science Foundation of China(Grant Nos.41240025 and 41373023);Start-up Foundation of the Ministry of Education for Overseas Returnees(Grant No.2012s001);Prospective Researching Project of Industry-University-Research of Jiangsu Province(Grant No.BY2013007-03)

摘　　要：Multiple sulfur isotopes （32S, 335, 345, 365） and oxygen isotopes （160, 180） in Beijing aerosols were measured with MAT-253 isotope mass spectrometer. The δ345 values of Beijing aerosol samples range from 1.68%o to 12.57%o with an average value of 5.86%0, indicating that the major sulfur source is from direct emission during coal combustion. The c5180 values vary from -5.29%0 to 9.02%0 with an average value of 5.17%o, 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 H202 in July and August, whereas H202 oxidation and Fe3＋ catalytic oxidation with SO2 exist simultaneously in September and October. Remarkable sulfur iso- tope 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 A335 and CAPE.Multiple sulfur isotopes(32S, 33 S, 34 S, 36S) and oxygen isotopes(16O, 18O) in Beijing aerosols were measured with MAT-253 isotope mass spectrometer. The δ34S 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 δ18O values vary from 5.29‰ 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 ?33S and CAPE.

关 键 词：Beijing aerosol multiple sulfur isotope oxygen isotope mass-independent fractionation 

分 类 号：X513[环境科学与工程—环境工程]