Potential particulate pollution derived from UV-induced degradation of odorous dimethyl sulfide

作     者：Liping Qiao Jianmin Chen Xin Yang 

作者机构：Center for Atmospheric Chemistry Studies Department of Environmental Science 6r Engineering Fudan University Shanghai 200433 China 

出 版 物：《Journal of Environmental Sciences》 (环境科学学报（英文版）)

年 卷 期：2011年第23卷第1期

页      面：51-59页

核心收录：

学科分类：0821[工学-纺织科学与工程] 081702[工学-化学工艺] 08[工学] 0817[工学-化学工程与技术] 082101[工学-纺织工程] 

基　　金：supported by the National Natural Science Foundation of China (No.40533017,40728006,40875073,40705045) supported by the 973 Program (No.2008CB417205)from the Ministry of Science and Technology of China 

主　　题：UV irradiation photodegradation dimethyl sulfide particulate pollutants odorous emission 

摘      要：UV-induced degradation of odorous dimethyl sulfide （DMS） was carried out in a static White cell chamber with UV irradiation. The combination of in situ Fourier transform infrared （FT-IR） spectrometer, gas chromatograph-mass spectrometer （GC-MS）, wide-range particle spectrometer （WPS） technique, filter sampling and ion chromatographic （IC） analysis was used to monitor the gaseous and potential particulate products. During 240 min of UV irradiation, the degradation efficiency of DMS attained 20.9%, and partially oxidized sulfur-containing gaseous products, such as sulfur dioxide （SO2）, carbonyl sulfide （OCS）, dimethyl sulfoxide （DMSO）, dimethyl sulfone （DMSO2） and dimethyl disulfide （DMDS） were identified by in situ FT-IR and GC-MS analysis, respectively. Accompanying with the oxidation of DMS, suspended particles were directly detected to be formed by WPS techniques. These particles were measured mainly in the size range of accumulation mode, and increased their count median diameter throughout the whole removal process. IC analysis of the filter samples revealed that methanesulfonic acid （MSA）, sulfuric acid （H2SO4） and other unidentified chemicals accounted for the major non-refractory compositions of these particles. Based on products analysis and possible intermediates formed, the degradation pathways of DMS were proposed as the combination of the O（1D）- and the OH- initiated oxidation mechanisms. A plausible formation mechanism of the suspended particles was also analyzed. It is concluded that UV-induced degradation of odorous DMS is potentially a source of particulate pollutants in the atmosphere.