Effects of NO"2 on oxidation mechanisms of atmospheric pollutant SO"2 over Baumberger sandstone [An article from: Building and Environment]

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Description:
The influence of NO"2 on oxidation of atmospheric pollutant gas SO"2 has been studied through Baumberger sandstone degradation. Experiments were conducted in a set of laboratory atmospheric chambers. By exposure of stone specimens to various pollutant regimes; e.g. single and combined pollutant gases (SO"2, NO"2), the reaction products (i.e. nitrite, nitrate, sulphite and sulphate) collected from run-off solutions as well as extracted from stones were analysed. Presentation rates of pollutant gases in terms of mg/cm^2s have been used to assess the interaction of SO"2 and NO"2 pollutant gases with Baumberger sandstone. For the first time, the contribution of NO"2 to SO"2 oxidation over the sample surface has been quantified (e.g. 37% in dry surface condition and 9% in wet surface condition). SO"2 oxidation over Baumberger sandstone in the presence of NO"2 produces nitrates over the surface of the sample; however, when no sandstone is present no NO"2 oxidation is produced.