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Discontinuities of pH at zone boundaries in isotachophoretic systems with poorly buffering leading electrolytes
Author(s) -
Reijenga Jetse,
Kašička Václav
Publication year - 1998
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.1150191014
Subject(s) - counterion , electrolyte , classification of discontinuities , chemistry , ion , isotachophoresis , inorganic chemistry , salt (chemistry) , analytical chemistry (journal) , chemical physics , chromatography , organic chemistry , electrode , mathematical analysis , mathematics
Discontinuities of pH at zone boundaries of strong ion sample zones in isotachophoretic systems with poorly buffering leading electrolytes have been discovered by dynamic computer simulations of isotachophoretic separations with uncommon electrolyte systems. When using a salt solution containing a strong cation (anion) as leading ion and a weak anion (cation) as counterion for the isotachophoretic separation of strong cations (anions), severe pH discontinuities are present at zone boundaries of these cations (anions). The magnitude of these pH discontinuities has been investigated as a function of several parameters, namely counter ion/leading ion concentration ratio of the leading electrolyte, p K values, and mobilities of sample ions and counterion.