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Verfasst von:Fröhlich, Daniel R. [VerfasserIn]   i
 Skerencak-Frech, Andrej [VerfasserIn]   i
 Gast, Michael [VerfasserIn]   i
 Panak, Petra [VerfasserIn]   i
Titel:Fulvic acid complexation of Eu(III) and Cm(III) at elevated temperatures studied by time-resolved laser fluorescence spectroscopy
Verf.angabe:Daniel R. Fröhlich, Andrej Skerencak-Frech, Michael Gas and Petra J. Panak
E-Jahr:2014
Jahr:01 September 2014
Umfang:9 S.
Fussnoten:Gesehen am 06.11.2020 ; Electronic supplementary information (ESI) available: Single componentspectra at 20 °C in 0.1 M NaCl solution of Eu3+and Cm3+as well as all Eu- andCm-FA complexes; loading capacities of all FAs for Eu(III) in 0.1 M NaCl solutionas a function of temperature; Arrhenius plots of logβ0(T) for the interaction ofEu(III) with SR and NL FA in 0.1 M NaCl solution and Cm(III) with Gohy-573,SR and NL FA in 0.1 M NaCl solution; speciation of Cm(III) as a function of theinitial FA concentration (FA = Gohy-573) in 0.1 M NaCl solution atT= 20 and80 °C;fifactors of the different Eu(III)-FA complexes atT=20–80 °C; detailedresults of the slope analysis of all experimental series. See DOI: 10.1039/c4dt02339k
Titel Quelle:Enthalten in: Dalton transactions
Ort Quelle:London : Soc., 1972
Jahr Quelle:2014
Band/Heft Quelle:43(2014), 41, Seite 15593-15601
ISSN Quelle:1477-9234
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.
DOI:doi:10.1039/C4DT02339K
URL:Bitte beachten Sie: Dies ist ein Bibliographieeintrag. Ein Volltextzugriff für Mitglieder der Universität besteht hier nur, falls für die entsprechende Zeitschrift/den entsprechenden Sammelband ein Abonnement besteht oder es sich um einen OpenAccess-Titel handelt.

Volltext ; Verlag: https://doi.org/10.1039/C4DT02339K
 Volltext: https://pubs.rsc.org/en/content/articlelanding/2014/dt/c4dt02339k
 DOI: https://doi.org/10.1039/C4DT02339K
Datenträger:Online-Ressource
Sprache:eng
K10plus-PPN:1738034593
Verknüpfungen:→ Zeitschrift

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