Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/99806
Type: Artigo de periódico
Title: Diffusion Coefficients Of Aqueous Phenols Determined By The Taylor Dispersion Technique: Evidence For Solute Adsorption On The Walls Of Teflon Tubing
Author: Loh W.
Tonegutti C.A.
Volpe P.L.O.
Abstract: The Taylor dispersion technique has been used to determine the diffusion coefficients of the m-alkoxyphenol and alkyl p-hydroxybenzoate homologous series in aqueous 5 × 10-3 mol dm-3 NaOH solutions and water-ethanol mixtures. The deviations from the expected behaviour for the higher homologues increase with the eluent water content and are attributed to solute adsorption on the walls of the Teflon dispersion tube. However, the adsorption corrections performed using Golay's equation for capillary chromatography do not account for all the diffusion coefficient deviations. The experimental solute hydrodynamic radii, calculated through the Stokes-Einstein equation, decrease as the eluent ethanol content is increased. These radii are smaller than those estimated by using atomic contributions or by adding the atomic van der Waals radii to the solute optimized geometry.
Editor: 
Rights: aberto
Identifier DOI: 10.1039/FT9938900113
Address: http://www.scopus.com/inward/record.url?eid=2-s2.0-0000366221&partnerID=40&md5=b67d40a4572663fd07fb128ef9ed5975
Date Issue: 1993
Appears in Collections:Unicamp - Artigos e Outros Documentos

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