Abstract
An equipment for the determination of mutual diffusion coefficients using the Taylor's dispersion technique is described. The radius of the capillary was determined with the help of various calibration methods. Diffusion coefficients of aqueous tetraalkylammonium perchlorates, Me4NClO4, and Et4NClO4, were measured at 25°C in the concentration range 10−3 to 5×10−2 mol-dm−3, and the slightly soluble Pr4NClO4 up to 1×10−2 mol-dm−3. The slope of linear plots ofD vs. \(\sqrt c \) is in agreement with theory, in contrast to the limiting valuesD 0, which all deviate by about −5% from the Nernst-Hartley values.
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Barthel, J., Gores, H.J., Lohr, C.M. et al. Taylor dispersion measurements at low electrolyte concentrations. I. Tetraalkylammonium perchlorate aqueous solutions. J Solution Chem 25, 921–935 (1996). https://doi.org/10.1007/BF00972589
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DOI: https://doi.org/10.1007/BF00972589