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Issue 41, 2014
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Fulvic acid complexation of Eu(III) and Cm(III) at elevated temperatures studied by time-resolved laser fluorescence spectroscopy

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Abstract

The interaction of Eu(III) and Cm(III) with three different aquatic fulvic acids (FA) was studied as a function of the temperature (T = 20–80 °C) in 0.1 M NaCl solution by time-resolved laser fluorescence spectroscopy. The speciation of both trivalent metal ions was determined by peak deconvolution of the recorded fluorescence spectra. For each studied metal ion–FA system only one complexed species is formed under the given experimental conditions. The stability constants at 20, 40, 60 and 80 °C (log β′(T)) were determined according to the charge neutralization model. The log β′ (20 °C) for the different FAs show similar values (log β(20 °C) = 5.60–6.29). The stability constants increase continuously with increasing temperature by approximately 0.3–1.0 orders of magnitude. The reaction enthalpies and entropies are derived from the integrated Van't Hoff equation. The results show that all investigated complexation reactions are endothermic and entropy-driven.

Graphical abstract: Fulvic acid complexation of Eu(iii) and Cm(iii) at elevated temperatures studied by time-resolved laser fluorescence spectroscopy

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Publication details

The article was received on 01 Aug 2014, accepted on 29 Aug 2014 and first published on 01 Sep 2014


Article type: Paper
DOI: 10.1039/C4DT02339K
Citation: Dalton Trans., 2014,43, 15593-15601

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    Fulvic acid complexation of Eu(III) and Cm(III) at elevated temperatures studied by time-resolved laser fluorescence spectroscopy

    D. R. Fröhlich, A. Skerencak-Frech, M. Gast and P. J. Panak, Dalton Trans., 2014, 43, 15593
    DOI: 10.1039/C4DT02339K

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