Anionenanalytik mit der On-line-Kopplung von Ionenchromatographie und induktiv gekoppelter Plasma-Massenspektrometrie

Die On-line-Kopplung von Ionenchromatographie und ICP-MS wurde zur Spurenanalyse anorganischer Anionen in wässriger Lösung verwendet. Es gelang eine Methode zu entwickeln, mit der sich bis zu 15 Anionen gleichzeitig innerhalb von 35 min bestimmen ließen. Verschiedene stationäre Phasen wurden untersu...

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Bibliographic Details
Main Author: Eickhorst, Thomas
Contributors: Seubert, Andreas (Prof. Dr.) (Thesis advisor)
Format: Dissertation
Language:German
Published: Philipps-Universität Marburg 2005
Chemie
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Table of Contents: The on-line coupling of ion chromatography and ICP-MS was used for trace analysis of inorganic anions in aqueous solution. A method for the simultaneous determination of up to 15 anions within 35 min was developed. Different stationary phases, – latex anion exchangers, grafted and surface-functionalized materials, were investigated and their separation characteristics were compared. The IC-ICP-MS system was successfully applied to analyze bromide, bromate, iodide and iodate in mineral water samples achieving detection limits of 0.1 µg/L, 0.07 µg/L, 0.15 µg/L and 0.05 µg/L respectively. Germanium dioxide added directly to the aqueous ammonium nitrate eluent was found to be well-suited as an internal standard for bromine and iodine species. The measured continuous germanium signal serves for real-time correction of non-specific interferences and also as a tool for system diagnostics. It was shown that the signal ratio of analyte-to-GeO2 for bromine- and iodine-containing analytes remains unaltered to a large extent despite changed system parameters. Thus a calibration with high long-term-stability over several weeks is made possible allowing quantification without time-consuming daily measurement of calibration series.