Laboratory simulation of SO2 heterogeneous reactions on hematite surface
under di erent SO2 concentrations |
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| Authors: | CUI Huxiong CHENG Tiantao YU Xingn CHEN Jianmin XU Yongfu and FANG Wen |
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| Institution: | Center for Atmospheric Chemistry Study, Department of Environmental Science & Engineering, Fudan University,
Shanghai 200433, China. E-mail: 072047010@fudan.edu. Cn,1. Center for Atmospheric Chemistry Study, Department of Environmental Science & Engineering, Fudan University,
Shanghai 200433, China. E-mail: 072047010@fudan.edu. Cn 3. State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics,
Chinese Academy of Science, Beijing 100029, China,Key Laboratory for Atmospheric Physics and Environment, Nanjing University of Information Science and Technology, Nanjing 210044, China,Center for Atmospheric Chemistry Study, Department of Environmental Science & Engineering, Fudan University,
Shanghai 200433, China. E-mail: 072047010@fudan.edu. Cn,State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics,
Chinese Academy of Science, Beijing 100029, China and Institute of Weather Modification, Chinese Academy of Meteorological Sciences, Beijing 100084, China |
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| Abstract: | The variations of sulfate formation and optical coefficients during SO2 heterogeneous reactions on hematite surface under different SO2 concentrations were examined using in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) and ion chromatograph (IC). Laboratory experiments revealed that within ambient SO2 of 0.51–18.6 ppmv, sulfate product, producing velocity, absorption and backward scattering coefficients showed an increasing trend with SO2 concentration. Under given SO2 concentration, the velocity of sulfate producing performed an evolution of initial increasing, midterm decreasing and final stabilizing. The reactive uptake and Brunauer-Emmett-Teller (BET) uptake coefficients of heterogeneous reactions rose with SO2 and exhibited high reactivities. Considering global warming, this result is important for the knowledge of heterogeneous reactions of SO2 on mineral particle surface in the atmosphere and the assessment of their impacts on radiative forcing. |
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| Keywords: | hematite heterogeneous reaction sulfate optical coefficient |
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