HPLC preparation of nitrate from ice cores for mass spectrometric 15N/14N measurements |
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| Authors: | P Bordat H D Freyer K Kobel and T Vissac |
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| Institution: | (1) Institut für Chemie und Dynamik der Geosphäre, Institut 2: Chemie der Belasteten Atmosphäre, Forschungszentrum Jülich GmbH, Postfach 1913, W-5170 Jülich, Germany;(2) Present address: Henkel France, F-51058 Reims, France;(3) Present address: Ecole Supérieure de Chimie Industrielle de Lyon (ESCIL), F-69100 Villeurbanne, France |
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| Abstract: | Summary A method for the analysis of  15N-data of nitrate at ultratrace levels in ice cores is described. Samples are pre-concentrated using a HPLC-system. Nitrate is then reduced using the Dumas method to molecular nitrogen, which is analysed by mass spectrometry. The overall analytical precision of the method is ±0.4 15N at a sample size of 35 bar  l N2. First results of deep ice-core analyses from Dome Summit, Greenland, are given. |
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