SO2 oxidation in supercooled droplets in the presence of O2

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作者：
Santachiara, G [1 ]
Prodi, F [1 ]
Udisti, R [1 ]
机构：
[1] CNR, Ist Fisbat, Grp Nubi & Precipitaz, I-40126 Bologna, Italy
来源：
NUOVO CIMENTO DELLA SOCIETA ITALIANA DI FISICA C-GEOPHYSICS AND SPACE PHYSICS | 1998年 / 21卷 / 06期
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摘要：
Sulphur dioxide oxidation in supercooled monodisperse droplets at T = - 13 degrees C was studied in the presence of oxygen. The SO2 concentration was found to range from 0.08 to 7.1 ppmv and the contact time between gases and droplets was 210 s. The experimental results showed that sulphate concentration due to SO2 oxidation is independent of temperature, i.e. the increase of SO2 solubility in the liquid phase balances the rate constant decrease of the oxidation reaction. Following McKay's kinetics (Atmos. Environ., 5 (1971) 7), we calculated the rate constant at T= -13 degrees C and the activation energy. A comparison was made between experimental S(VI) oxidation concentrations due to oxygen and theoretical oxidation values due to O-3, H2O2 and oxygen in the presence of catalyzers (Fe3+, Mn2+).
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页码：667 / 673
页数：7
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