Abstract (1) The oxidation velocity of sodium sulphite was studied, when the condition is satisfied, under which the concentration of oxygen in the boundary surface layer is always zero. The oxidation velocity is independent of the concentration of sodium sulphite and is proportional to the boundary surface area. (2) The theoretical considerations on the observed oxidation velocity was given. (3) The assumption that only the molecule of oxygen, whose component of velocity vertical to the boundary surface is greater than a threshold value u0 is able to enter into the liquid phase, was given, and the values of u0 were calculated at 15°C., 25°C. and 35°C. from the experimentally obtained result. The calculated value of u0 is 1.65×105 cm. per sec. and is independent of the temperature within the observed region.
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Miyamoto et al. (1931) studied this question.