Simultaneous separation of nitrate, nitrite and ammonium by capillary electrophoresis |
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Authors: | A Padarauskas V Olšauskaite V Paliulionyte B Pranaityte |
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Institution: | (1) Department of Analytical and Environmental Chemistry, Vilnius University, Naugarduko 24, 2006 Vilnius, Lithuania |
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Abstract: | Summary A capillary electrophoretic method for the simultaneous separation of nitrate, nitrite and ammonium has been developed. Direct
(NO3
−, NO2
−) and indirect (NH4
+) UV detection at 214 nm in conjunction with electromigration sampling from both ends of the capillary was used. Two electrolyte
systems based on imidazole-sulfate (pH 3.8) and copper(II)-ethylenediamine-chloride (pH 8.0) were investigated. Optimisation
of the experimental parameters such as electrolyte concentration, pH, nature of the counter-ion, was studied. The method permits
excellent separation of three nitrogen species in only 4 min. The analytical performance of both electrolyte systems is compared
in terms of migration time and peak area repeatability and detectability. Alkaline electrolyte shows a better overall analytical
performance. |
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Keywords: | Capillary electrophoresis Nitrate nitrite and ammonium |
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