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Title
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Potentiometric detection for capillary electrophoresis: Determination of organic acids
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Author
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Abstract
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| A potentiometric detector was developed for CE and applied to the determination of aliphatic carboxylic acids (up to C-10). The electrodes used were of the ''coated wire'' type. Insulated Cu wires (from 100 to 250 mu m diameter), with only the tip of the wire exposed, were directly coated with ''liquid membrane'' phases. A quaternary ammonium salt and a lipophilic macrocyclic pentaamine were used as carrier molecules. The electrodes were positioned at the end of the capillary (''wall-jet'' type of construction). The best compromise between separation and detection characteristics was obtained with a HEPES buffer system. Detection limits of 100 fmol were obtained (injection by electromigration). Calibration curves were linear in the range of 0-25 pmol injected. The behavior of the detection system is discussed theoretically. |
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Language
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English
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Source (journal)
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Analytical chemistry. - Washington, D.C., 1948, currens
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Publication
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Washington, D.C.
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1996
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ISSN
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0003-2700
[print]
5206-882X
[online]
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DOI
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10.1021/AC9604494
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Volume/pages
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68
:24
(1996)
, p. 4441-4445
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ISI
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A1996VX78600022
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Full text (Publisher's DOI)
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