Please use this identifier to cite or link to this item: https://doi.org/10.1021/ac001313f
Title: Field-amplified sample injection combined with water removal by electroosmotic flow pump in acidic buffer for analysis of phenoxy acid herbicides by capillary electrophoresis
Authors: Zhu, L. 
Kee Lee, H. 
Issue Date: 1-Jul-2001
Citation: Zhu, L., Kee Lee, H. (2001-07-01). Field-amplified sample injection combined with water removal by electroosmotic flow pump in acidic buffer for analysis of phenoxy acid herbicides by capillary electrophoresis. Analytical Chemistry 73 (13) : 3065-3072. ScholarBank@NUS Repository. https://doi.org/10.1021/ac001313f
Abstract: A procedure that combines two common stacking techniques, field-amplified sample injection and water removal, with an electroosmotic flow pump, is used to separate phenoxy acid herbicides by capillary zone electrophoresis. Before sample loading, a long plug of water was hydrodynamically injected into the capillary both to serve as the medium to permit a high electric field strength and to contain sample anions. Because of this long length of water, the number of ions injected into the capillary was greatly increased. Electrokinetic injection at reversed voltage was then used for introducing negatively charged ions from the diluted sample into the column. The water was removed from the capillary using the electroosmotic flow (EOF) pump when the EOF of the background electrolyte was suppressed. This method afforded a sensitivity enhancement of greater than 3000 times. Combined with solid-phase extraction, detection limits for the phenoxy acid herbicides as low as 0.01 ng/mL could be achieved.
Source Title: Analytical Chemistry
URI: http://scholarbank.nus.edu.sg/handle/10635/76176
ISSN: 00032700
DOI: 10.1021/ac001313f
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