Abstract: Four ternary systems have been used for the determination of mass transfer rates between single organic drops and aqueous solutions. The solutes chosen are highly in favor of organic dispersed phase so that the resistance can be considered solely in the continuous aqueous phase. In the experiments for pure systems, special attention has been paid to the purification of all substances employed and to the avoidance of possible contaminations of apparatus and both liquids, and reproducible mass transfer results can thus be obtained over the range of drop Reynolds number between 4 and 1000. These data have been used to test various correlations proposed by different authors, and it has been found that each correlation can fit only a limited range of drop Reynolds number, i.e. at Re≤50, the measured continuous phase coefficients essentially follow those of solid spheres during dissolution, at Re≥1000, nearly agree with those predicted from the equation proposed by Handles and Baron[26], and at 100