JRP CALL information
Supported By

European Commission

Short description of the work
Seven samples of 1 mM Am(III) in the presence of 0.03 M lactate at varying pH value (1-7) have been prepared at the Institute of Nuclear Waste Disposal (KIT, Karlsruhe, Germany). Due to the stable operation at the ESRF it was possible to measure 12-15 scans of sample 1-6. Due to a clearly visible precipitation in sample 7, possibly a result of hydrolysis at pH 7, 7 scans were measured of both the clear solution and the precipitate.
The obtained EXAFS spectra will now be analyzed to obtain the molecular structure (coordination numbers and Am-O, Am-C distances) of the Am(III) lactate species as a function of the pH value. Furthermore, the experimental EXAFS spectra will be treated by iterative transfortmation factor analysis and the results will be compared to speciation calculations using tabulated thermodynamic data. The results will add to a general molecular-level understanding of the geochemical behavior of trivalent actinides.
The results will be presented at national and international conferences and meetings. Furthermore, publication of the data in a peer review journal is planned.


Main visitor contact data
Name: Dr. Daniel R. Froehlich
Organisation: University Heidelberg

JRP Identification
JRP nr: TALI-C04-01
JRP title: EXAFS study of the pH dependence of Am(III) complexation with lactate
JRP scope: Scope 2: Actinide in the geological environment

Visited Associated Pooled Facility
Visited APF during the stay: HZDR - ROBL
Name of the APF Contact Person: Dr. André Rossberg

Other APF and organisation involved in the JRP
Other organisations involved:
Other APF involved in the project: KIT-INE - Laboratories

Description of the work done at the associated pooled facility
Start date of the stay: 1/24/2015
End date of the stay: 1/27/2015
Quantity of access: 9
Access Unit: Shifts
Misc.: Work during week-ends

Other APF visitors of the JRP during the stay
Visitor 2: Dr. Andrej Skerencak-Frech (KIT-INE)
Visitor 3: Dr. Ugras Kaplan (KIT-INE)
Visitor 4: Carsten Koke (University Heidelberg)