The effect of ionic strength on the manganese catalyzed oxidation of sulfur(IV) |
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| Affiliation: | 1. School of Chemical and Environmental Engineering, Wuhan Polytechnic University, Wuhan 430023, China;2. School of Environmental Studies, China University of Geosciences (Wuhan), Wuhan 430074, China;3. School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA, USA;4. Hubei Environment Monitoring Center, Wuhan 430072, China;1. Key Lab of Colloid and Interface Chemistry, Shandong University, Jinan 250100, China;2. School of Chemistry and Chemical Engineering, Qilu Normal University, Jinan 250100, China;3. School of Chemical Sciences, University of the Chinese Academy of Sciences, Beijing 100049, China;4. Environment Research Institute, Shandong University, Qingdao 266237, China;1. Lanzhou University, Key Laboratory for Environmental Pollution Prediction and Control, College of Earth and Environmental Sciences, Lanzhou, Gansu Province, China;2. Laboratory for Earth Surface Processes, College of Urban and Environmental Science, Peking University, Beijing, China;3. CAS Center for Excellence in Tibetan Plateau Earth Sciences, Chinese Academy of Sciences, Beijing, China |
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| Abstract: | We have measured the effect of ionic strength on the rate of the manganese catalyzed oxidation of sulfur in both the high (10−3M) and low (10−6M) sulfur concentration regimes. The effect is an extreme inhibition of the reaction as the ionic strength increases. Ionic strength, not hydrogen ion, accounts for the pH dependence of the rate, and makes it possible (1) to explain some unusual behavior described in the literature on this reaction, and (2) to reconcile in part a number of the literature rates. The inhibition is the same in both concentration regimes. Because of the complexity of this reaction, we believe that it is still not clear which rate law is appropriate for use in atmospheric calculations, athough we suggest provisional use of the first order, low sulfur rate. |
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