Abstract
Low concentration equilibria of SO2 between air and water have been calculated for temperatures in the range 0 to 60°C and air concentrations of 2 ppb to 100 ppm incorporating the best currently available theory to define this process. The data showed negative, non-regular deviations of from less than 1 to about 12% lower than the limited experimental aqueous concentration data available at these levels. Log-log plots of these equilibrium data were linear over a four decade concentration span in air and provided a format which may be readily interpolated for data access. Linear plots of the fraction of the total aqueous SO2 present as unreacted SO2 presented here for the first time, show a more marked rise with concentration than was expected, which is used to qualitatively explain biological and corrosion activity of dilute solutions of SO2.
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