Entwicklung von Verfahren zur Bestimmung von Spurengehalten Seltener Erden in verschiedenen Matrizes mit ICP-AES nach Anreicherung und Abtrennung mittels Extraktionschromatographie

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The use of ICP-OES to determinate ”Rare Earth Elements“ in different matrices often fails because of high spectral interferences. To achieve an correct result the use of a sample preparation is advisable. In this work Extractionchromatography is used as sample preparartion. Three different substances were used as stationary phase. These are Triazaheptan-1,4,7,7-tetraaceticacid (DETATA), Tetraphenylmethylendiphosphineoxide. (TPMDPO) und Tri-n-octylphosphineoxide (TOPO). If DETATA is used as staionaric phase the recovery of REE in the final solution is reduced to 40-60% when bivalent ions such as Ni2+ and Fe2+ are present in the sample. So this substance is not reliable in the use as stationaric phase if the sample is a steelmatrix. In highly concentrated KCl-solution as matrix the recovery of REE’s increases to 98%. In the second part the results of the experiments with TPMDPO are presented. In the presence of Cr3+, Ni2+ oder Mn2+ the recovery decrease significantly. So this substance is also unusable if the matrix is steel. The third examined organic substance is TOPO. If NH4NO3 is added as salting-out material and after reducing the solution with hydrazine the recovery of REE’s is qunatitative. The improvement of the detection limit exceeds the factor of 10 if ICP-OES is the used analysing method.
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Dokumententyp:
Wissenschaftliche Abschlussarbeiten » Dissertation
Fakultät / Institut:
Fakultät für Chemie
Dewey Dezimal-Klassifikation:
500 Naturwissenschaften und Mathematik » 540 Chemie
Stichwörter:
rare earth elements, enrichment, extractionchromatography, stationaric phase, separation, steel
Beitragende:
Priv.-Doz. Dr. Kuß, Heinz-Martin [Betreuer(in), Doktorvater]
Prof. Dr. Golloch, Alfred [Gutachter(in), Rezensent(in)]
Sprache:
Deutsch
Kollektion / Status:
Dissertationen / Dokument veröffentlicht
Datum der Promotion:
20.02.2003
Dokument erstellt am:
20.02.2003
Dateien geändert am:
13.04.2007
Medientyp:
Text