Finding the 3D structure of a molecule in its IR spectrum |
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Authors: | J Gasteiger J Schuur P Selzer L Steinhauer V Steinhauer |
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Institution: | (1) Faculty of Agriculture, Hasanuddin University, Ujung Pandang 90245, Indonesia, ID;(2) Institute for Inorganic and Analytical Chemistry, Technical University Clausthal, Paul-Ernst-Strasse 4, D-38678 Clausthal-Zellerfeld, Germany, DE |
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Abstract: | The labile iron(II) and iron(III) species are complexed directly in the sample solution with 1,10 phenanthroline and ferron
(8-hydroxy-7-iodoquinoline-5-sulfonic acid), respectively. The complexes thus formed are mutually adsorbed and separated by
solid phase extraction. The direct determination of iron(III) and iron(II) species with flame atomic absorption spectrometry
(FAAS) follows the elution of the iron(III)-ferron complex adsorbed by an anion-exchange and an iron(II)-phenanthroline complex
adsorbed by a non-polar RP-18 phase. In the case of indirect determination, the iron(II)-phenanthroline complex that passes
through the anion-exchange phase, is measured, and the content of iron(III) is calculated by the difference of the iron(II)
and the total iron content. A direct determination with this method has been applied to the iron species analysis in wine
samples and the results are compared with those obtained for the determination with adsorptive stripping voltammetry (ASV)
as reference method.
Received: 17 August 1995/Revised: 12 February 1996/Accepted: 14 February 1996 |
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