Concentration profile of sodium ion in gas absorption

In this work the absorptions of sulphur dioxide and hydrogen sulphide into jelly containing one of sodium chloride, sodium sulphite and sodium hydroxide aqueous solutions have been carried out. After a certain exposure time, the jelly was cut into slices in which the concentration of sodium ion was measured by a flame spectrometer. The concentration of sodium ion at the gas—jelly interface was considerably higher than that in the bulk except for the H₂SNaCl system. Experimental results are compared with the analytical solution based on the molecular penetration theory in which the molecular diffusivity is replaced by the effective ionic diffusivity, and it is found that both dissociation and reaction effects influence the concentration profile of sodium ion in the liquid phase.