کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1207338 | 965263 | 2007 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Combination of large volume sample stacking and dynamic pH junction for on-line preconcentration of weak electrolytes by capillary electrophoresis in comparison with isotachophoretic techniques
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آنالیزی یا شیمی تجزیه
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
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.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Chromatography A - Volume 1155, Issue 2, 6 July 2007, Pages 193–198
Journal: Journal of Chromatography A - Volume 1155, Issue 2, 6 July 2007, Pages 193–198
نویسندگان
Jana Horáková, Jan Petr, Vítězslav Maier, Joanna Znaleziona, Andrea Staňová, Jozef Marák, Dušan Kaniansky, Juraj Ševčík,