Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1245196 | Talanta | 2007 | 7 Pages |
Abstract
Thermal lens detection with a 325.0 nm He–Cd excitation laser is used for thermooptical indirect detection in combination with the capillary electrophoretic separation of organic anions. The optimization of indirect thermooptical detection is discussed. With Mordant Yellow 7 (an azo dye) chosen as a probe ion limits of detection for 1-heptane-, 1-pentane-, 1-butane-, 1-propanesulfonic, and acetic acid at a level of n × 10−7 M were achieved with a separation electrolyte containing 50 μM of the probe ion and 5 mM Tris pH 9.90. A further increase in the detection sensitivity (twofold decrease in the limit of detection ) was obtained with a separation electrolyte containing a volume fraction of 20% acetonitrile.
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Authors
D.A. Nedosekin, S.N. Bendrysheva, W. Faubel, M.A. Proskurnin, U. Pyell,