Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1207338 | Journal of Chromatography A | 2007 | 6 Pages |
Abstract
An on-line preconcentration capillary electrophoresis (CE) technique, which combines a large volume sample stacking with a dynamic pH junction technique, is introduced in this paper. This dynamic pH junction with co-electroosmotic migration is formed between sodium borate pH 9.5 and sodium phosphate pH 2.5 with 150 mM sodium dodecylsulfate (SDS). A full capillary based injection allows determination of weak acidic compounds at ppb concentration levels (achieved LOD for benzoic acid was 11 nmol L−1). The proposed preconcentration method was compared with ITP/ITP (LOD 120 nmol L−1), ITP/CZE (LOD 740 nmol L−1) and a simple CZE method (LOD 23,330 nmol L−1). The analytical potential of this method was assessed with juice test samples.
Keywords
Related Topics
Physical Sciences and Engineering
Chemistry
Analytical Chemistry
Authors
Jana Horáková, Jan Petr, Vítězslav Maier, Joanna Znaleziona, Andrea Staňová, Jozef Marák, Dušan Kaniansky, Juraj Ševčík,