Computer aided analysis of electric field gradients within isotachophoretic boundaries between weak electrolytes

Computer simulations are used to describe the temporal evolution of concentration and potential profiles in isotachophoresis. In contrast to other theoretical treatments of moving boundaries between weak electrolytes, diffusional effects are considered, which allows an exact prediction of boundary s...

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Bibliographic Details
Published in:Journal of Chromatography A 1985-01, Vol.320 (1), p.23-32
Main Authors: Mosher, R.A., Thormann, W., Bier, M.
Format: Article
Language:English
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Summary:Computer simulations are used to describe the temporal evolution of concentration and potential profiles in isotachophoresis. In contrast to other theoretical treatments of moving boundaries between weak electrolytes, diffusional effects are considered, which allows an exact prediction of boundary shape. The computer predicted shapes of three different electric field gradients between migrating protolytes are analyzed: (i) the commonly observed sigmoidal field increase from the leading to the terminating zone; (ii) the mirror image of such a gradient in the enforced migrational mode; (iii) the steady state “bump” gradient which can be established between a weak acid and its salt. The value of these predictions to the experimentalist is discussed.
ISSN:0021-9673
DOI:10.1016/S0021-9673(01)90476-5