Please use this identifier to cite or link to this item: https://doi.org/10.1016/j.chroma.2004.07.048
Title: Determination of ammonium and metal ions by capillary electrophoresis- potential gradient detection using ionic liquid as background electrolyte and covalent coating reagent
Authors: Qin, W.
Li, S.F.Y. 
Keywords: Capillary zone electrophoresis
Ionic liquids
Issue Date: 10-Sep-2004
Citation: Qin, W., Li, S.F.Y. (2004-09-10). Determination of ammonium and metal ions by capillary electrophoresis- potential gradient detection using ionic liquid as background electrolyte and covalent coating reagent. Journal of Chromatography A 1048 (2) : 253-256. ScholarBank@NUS Repository. https://doi.org/10.1016/j.chroma.2004.07.048
Abstract: A capillary zone electrophoresis (CZE)-potential gradient detection (PGD) method coupled with field-amplified sample injection was developed to determine alkali metal, alkaline-earth metal, nickel, lead and ammonium ions. The capillary surface was coated with dialkylimidazolium-based ionic liquid and thus the electroosmotic flow (EOF) of the capillary was reversed. The buffer composed of 7.5 mM lactic acid, 0.6 mM 18-crown-6, 12 mM α-cyclodextrin (α-CD); it was adjusted to pH 4.0 by 1-hexyl-3-methylimidazolium hydroxide. The 11 cations were baseline separated within 14 min with 5.1-18.9·10 4 plates (for 40-cm-long capillary) in separation efficiency, and the detection limits were in the range of 0.27-7.3 ng/ml. The method showed good reproducibility in terms of migration time with RSD ≤ 0.90% for run-to-run and ≤1.65 for day-to-day assessment. © 2004 Elsevier B.V. All rights reserved.
Source Title: Journal of Chromatography A
URI: http://scholarbank.nus.edu.sg/handle/10635/93538
ISSN: 00219673
DOI: 10.1016/j.chroma.2004.07.048
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