Abstract
Absorption of dilute SO2 in water, aqueous solutions of H2SO4, NaHSO3 and Fe(II)-edta was theoretically and experimentally investigated. It was found that the dissociation of SO2 in solutions (SO2+H2O→←HSO-3+H+) has a remarkable effect on its absorption rate. The presence of H2SO4 or NaHSO3 prevents the dissociation of SO2, resulting in lower absorption rate than that in pure water. The absorption rate in Fe(II)-edta solution was found to be faster than that into water because of the buffer capacity of Fe(II)-edta solution. The experimental results are satisfactorily explained by the theory of gas absorption accompanied by instantaneous reversible reactions.
