关键词: lysine hydrochloride;arginine hydrochloride;diffusion coefficient;metallic diaphragm cell method;semi-empirical model

Abstract: The diffusion coefficients** ofl-lysine hydrochloride andl-arginine hydrochloride in their
aqueous solu- tions at 25℃ were determined by the metallic diaphragm cell method which is
characterized by accuracy, promptness and convenience. Meanwhile, the densities and
viscosities of the solutions were also determined. Based on all these data a semi-empirical
model for correlating the diffusion coefficients of solid organic salts in their aqueous
solutions at 25℃ was proposed. The fitting result of this model is comparatively
satisfactory. Compared to a former model, Gordon Model, this model can avoid a number of
difficulties and arduous work.

Key words: lysine hydrochloride, arginine hydrochloride, diffusion coefficient, metallic diaphragm cell method, semi-empirical model