Use of disposable clean-up columns for selective removal of humic substances prior to measurements with a nitrate ion-selective electrode |
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Authors: | Istvan Csiky György Marko-Varga Jan Åke Jönsson |
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Institution: | Department of Analytical Chemistry, University of Lund, P.O. Box 124, S-221 00 Lund Sweden |
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Abstract: | Measurements of nitrate in natural waters with a nitrate ion-selective electrode are seriously affected by the presence of humic substances. These can be removed quantitatively by a clean-up procedure with cheap disposable adsorption columns packed with chemically-bonded alkylamino silica. The method is applied to natural water samples with high contents of humic substances. The nitrate concentrations found were in good agreement with determination by ion chromatography. |
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