Abstract: The diffusion coefficients of aqueous L-threonine solutions were determined from 298.15K to
328.15K by the metallic diaphragm cell method with accuracy, promptness and convenience.
Meanwhile, the densities and viscosities of the solutions were also determined and
correlated. Based on a seml-empirical model for correlating the diffusion coefficients of
some amino acids in their aqueous solutions, a new semi-empirical model for correlating the
diffusion coefficients involving temperature was provided, which is more comprehensive and
less experiment dependent compared to the previous model. The fitting results are
satisfactory. Compared to a former model for correlating the diffusion coefficients of
solid organic salts in their aqueous solutions, this model provides significant improvement
in correlation of diffusion coefficients with different temperatures avoiding arduous work.

Key words: L-threonine, diffusion coefficient, metallic diaphragm cell method, semi-empirical model

摘要： The diffusion coefficients of aqueous L-threonine solutions were determined from 298.15K to
328.15K by the metallic diaphragm cell method with accuracy, promptness and convenience.
Meanwhile, the densities and viscosities of the solutions were also determined and
correlated. Based on a seml-empirical model for correlating the diffusion coefficients of
some amino acids in their aqueous solutions, a new semi-empirical model for correlating the
diffusion coefficients involving temperature was provided, which is more comprehensive and
less experiment dependent compared to the previous model. The fitting results are
satisfactory. Compared to a former model for correlating the diffusion coefficients of
solid organic salts in their aqueous solutions, this model provides significant improvement
in correlation of diffusion coefficients with different temperatures avoiding arduous work.

关键词: 流体扩散系统;水合L-苏氨酸溶液;液体;横隔膜;温度