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pH Changes in Immobiline gels due to low‐molecular mass ion adsorption and condition for salt front formation during electrophoretic desorption
Author(s) -
Stoyanov Alexander V.,
Righetti Pier Giorgio
Publication year - 1997
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.1150180308
Subject(s) - adsorption , desorption , salt (chemistry) , chemistry , electrophoresis , ion , analytical chemistry (journal) , chromatography , inorganic chemistry , organic chemistry
Abstract A simple theoretical model of low molecular mass ion adsorption on a weak exchanger is proposed. For a system containing immobilized charges in uniform concentration the pH change values connected with neutral salt addition and followed by further washing and voltage application are evaluated. The question of stability of the moving boundary, arising in the area near the electrodes, is considered for the constant current stabilization at different values of Immobiline concentration, p K values of Immoboline and salt concentration. The threshold values of ion mobility capable of providing a sharp salt front formation are also evaluated for conditions of strong adsorption. We found that, with extremely acidic Immobilines, a sharp salt front does not arise under the latter condition, even in the case of very high Immobiline concentrations.