The wall as a source of hydroxyl radicals in smog chambers |
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| Affiliation: | 1. CÚRAM, SFI Research Centre for Medical Devices, National University of Ireland Galway, Ireland;2. Discipline of Pathology, Lambe Institute for Translational Research, School of Medicine, National University of Ireland Galway, Ireland;3. School of Biological and Chemical Sciences, Ryan Institute, National University of Ireland Galway, Ireland;1. Department of Chemistry, Key Laboratory of Functional Molecular Engineering of Guangdong Province, South China University of Technology, Guangzhou 510641, China;2. State Key Laboratory of Optoelectronics Materials and Technologies, Sun Yat-Sen University, Guangzhou 510275, China;3. Department of Anesthesiology, Guangdong Provincial People’s Hospital, Guangzhou 510080, China |
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| Abstract: | The role of the wall of a smog chamber as a radical source has been investigated in several ways. From data in the literature evidence is obtained that HNO3, present on the reactor wall, may react with NO in the gas phase according to the reaction HNO3(wall) + 2NO + H2O → 3HNO2 to give nitrous acid. Nitrous acid may subsequently photolyze to give hydroxyl radicals.Experimental evidence about the occurrence of this reaction was obtained by u.v.-irradiation of propane-NOx mixtures with and without NH3. The presence of NH3 resulted in a drastically reduced photochemical reactivity, suggesting that neutralization of nitric acid prevented the reaction of HNO3 with NO. Inclusion of the reaction mentioned above into a computer-model gave a good agreement between experimental and calculated concentration profiles of NO, NO2 and O3 in experiments with CO-NOx and propane-NOx, mixtures. The results of our findings and those from others are discussed. |
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