TRLFS study on the complexation of Cm(III) with nitrate in the temperature range from 5 to 200 °C
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A. Skerencak
Abstract
The formation of aqueous Cm(III) nitrate complexes is studied in the temperature range from 5 to 200 °C by time resolved laser fluorescence spectroscopy (TRLFS). The experiments are performed in a custom build high pressure and high temperature fluorescence cell. The complex formation is measured at nitrate concentrations ranging from 0.10 to 4.61 mol/kg H2O. The mono- and dinitrate complexes are quantified by peak deconvolution of the fluorescence spectra and the complexation constants are determined as a function of the temperature. The conditional equilibrium constants are extrapolated to zero ionic strength using the specific ion interaction theory (SIT) and the thermodynamic standard state data (ΔrH°m, ΔrS°m, ΔrG°m, ΔrC°p,m) are determined from the temperature dependence of the equilibrium constants at I=0. The equilibrium constants up to 75 °C are well described by the Van´t Hoff equation (ΔrH°m independent of T and ΔrC°p,m=0). Modelling of the data at higher temperatures requires an extended equation including a term for the heat capacity changes (ΔrC°p,m).
© by Oldenbourg Wissenschaftsverlag, München, Germany
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Artikel in diesem Heft
- TRLFS study on the complexation of Cm(III) with nitrate in the temperature range from 5 to 200 °C
- Rapid method for the determination of actinides in soil and sediment samples by alpha spectrometry
- Gas chemical investigation of hafnium and zirconium complexes with hexafluoroacetylacetone using preseparated short-lived radioisotopes
- A robust biamperometric titration methodology for the determination of uranium by Ti(III) reduction in the presence of plutonium
- Preparation and characterization of Zr-IV-containing Mg-Al-Cl layered double hydroxide
- Radiation and chemical stability of calix[4]arene derivatives as prospective liquid-liquid extractants
- A comparative study of neodymium sorption by yeast cells
- A novel technique for modifier free delivery of ligands for supercritical fluid extraction
- Measurement of I-129 in environmental samples by ICP-CRI-QMS: possibilities and limitations
- Incorporation of iodine into uranophane formed during the corrosion of spent nuclear fuel
