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Influence of transference number on migration and deformation of concentration boundaries in capillary zone electrophoresis
Author(s) -
Štědrý Milan,
Popelka Štěpán,
Gaš Bohuslav,
Kenndler Ernst
Publication year - 1996
Publication title -
electrophoresis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.666
H-Index - 158
eISSN - 1522-2683
pISSN - 0173-0835
DOI - 10.1002/elps.1150170623
Subject(s) - electrolyte , capillary electrophoresis , capillary action , electrophoresis , boundary (topology) , chemistry , position (finance) , ionic bonding , chromatography , analytical chemistry (journal) , mechanics , materials science , ion , physics , mathematics , composite material , mathematical analysis , electrode , organic chemistry , finance , economics
The change of the position and shape of a concentration boundary existing in the background electrolyte in capillary zone electrophoresis is teated theoretically. Such boundaries may occur when the ionic concentration, c , of the sample differs from that of the background electrolyte. Both mathematical treatment and numerical simulation lead to the result that when an (initially symmetrical) concentration boundary migrates in the capillary it becomes nonsymmetrical. The reason for this is the nonsymmetry of the function, which is obtained as the difference of the transference number (which is a function depending on c ) and its linear approximation at the average value of the concentration. Numerical simulations for capillary zone electrophoresis with LiI or potassium benzorate as a hypothetical background electrolyte show the formation of asymmetrical plugs for samples of more diluted electrolyte solutions.