Issue 6, 2002
From the journal:

Analyst

Simultaneous separation of inorganic anions and cations using capillary electrophoresis with a movable contactless conductivity detector

Verena Unterholzner,a   Miroslav Macka,b   Paul R. Haddadb  and  Andreas Zemann*a  

* Corresponding authors

a Institute of Analytical Chemistry and Radiochemistry, Leopold-Franzens-University of Innsbruck, Innrain 52a, Innsbruck, Austria
E-mail: andreas.zemann@uibk.ac.at

b Australian Centre for Research on Separation Science, School of Chemistry, University of Tasmania, GPO Box 252-75, Hobart, Tasmania, Australia

Abstract

A number of small inorganic anions and cations were separated after injection of the sample into both ends of a separation capillary. The ions were detected using a capacitively coupled contactless conductivity detector (CCCCD) which could be placed at various positions along the capillary length. Counter-directional migration of anions and cations occurs towards the detector, which is placed at an appropriate position along the capillary so that the migration order is determined by the respective effective separation capillary lengths for both anions and cations. As the CCCCD detector can be easily moved to any position along the capillary, virtually any effective separation length can be attained. Depending on the number of analytes in the sample, one can choose to obtain either electropherograms with inter-migrating zones of cations and anions or separations with distinct regions of anion and cation zones, respectively. A new term ‘apparent separation selectivity’ is introduced to describe the manner in which the position of the detector can be varied in order to determine the final separation.

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Article information

DOI
https://doi.org/10.1039/B202765H
Article type
Communication
Submitted
19 Mar 2002
Accepted
04 Apr 2002
First published
30 Apr 2002

Analyst, 2002,127, 715-718

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Simultaneous separation of inorganic anions and cations using capillary electrophoresis with a movable contactless conductivity detector

V. Unterholzner, M. Macka, P. R. Haddad and A. Zemann, Analyst, 2002, 127, 715 DOI: 10.1039/B202765H

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