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In-line application of electric field in capillary separation systems Part II: Separation parameters affecting the conductivity
Karlstad University, Faculty of Technology and Science, Department of Chemistry and Biomedical Sciences.
Karlstad University, Faculty of Technology and Science.
Karlstad University, Faculty of Technology and Science, Department of Chemistry and Biomedical Sciences.
2006 (English)Manuscript (preprint) (Other academic)
Place, publisher, year, edition, pages
2006.
National Category
Chemical Sciences
Research subject
Chemistry
Identifiers
URN: urn:nbn:se:kau:diva-1914OAI: oai:DiVA.org:kau-1914DiVA, id: diva2:5009
Available from: 2007-10-08 Created: 2007-10-08 Last updated: 2011-11-14Bibliographically approved
In thesis
1. In-line application of electric fields in capillary separation systems
Open this publication in new window or tab >>In-line application of electric fields in capillary separation systems
2006 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

The magnitude of an electric field possible to apply in a capillary separation system is limited, because a high electric field causes a too high current through the capillary. Application of the electric field in-line will give an increased conductivity in the column, further increasing the risk of too high currents. The conductivity changes were found to result from an overall increase in ionic strength within the electric field. The increase in ionic strength is caused by the increase in mobile phase ions with electrophoretic velocity against the flow, together with OH- or H3O+ ions (depending on polarity) formed at the inlet electrode. Further it was found that the use of a pressurized reservoir or splitting of the flow at the inlet electrode could significantly limit the conductivity changes and thereby the maximum applicable electric field strengths could be increased.

Place, publisher, year, edition, pages
Fakulteten för teknik- och naturvetenskap, 2006
Series
Karlstad University Studies, ISSN 1403-8099 ; 2006:55
Keywords
capillary separation, conductivity, in-line, electric field assisted liquid chromatography
National Category
Analytical Chemistry
Research subject
Chemistry
Identifiers
urn:nbn:se:kau:diva-1197 (URN)91-7063-086-0 (ISBN)
Public defence
2006-12-15, 9C203, Karlstad University, Karlstad, 10:15
Opponent
Supervisors
Available from: 2007-10-08 Created: 2007-10-08

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Blomberg, Lars

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