Diffusive isotope fractionation of non- and perdeuterated benzenes and toluenes in aqueous solution was investigated. The experimental method was based on a Stokes diaphragm cell. The isotope composition of diffusate and retentate was found to be identical within a range of uncertainty of ±5‰ for benzene and ±10‰ for toluene. These data are consistent with a previous fractionation study using phase-transition kinetics as the potentially fractionating step. The present study contributes to strengthening the data base for diffusive isotope fractionation of organic compounds in aqueous solution. According to the presented data, diffusion of naturally occurring, monodeuterated organic compounds does not significantly affect their hydrogen isotope pattern.

研究了非和氘代苯和甲苯在水溶液中的扩散同位素分馏。实验方法基于Stokes隔膜电池。发现扩散物和截留物的同位素组成在苯的±5‰和甲苯的±10‰的不确定度范围内是相同的。这些数据与先前使用相变动力学作为潜在分馏步骤的分馏研究相一致。本研究有助于加强数据库中水溶液中有机化合物的扩散同位素分馏的数据库。根据提供的数据，自然发生的单氘代有机化合物的扩散不会显着影响其氢同位素模式。