JRP CALL information
Supported By

European Commission

Short description of the work
Seven samples of 1 mM Am(III) in the presence of 1 M sodium formate at varying pH (2.0 and 4.0) 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 a minimum of 10 scans for each sample.
The obtained EXAFS spectra provide a sufficient quality to ensure an evaluation up to k = 10-11 Å-1. The data will now be evaluated to obtain the molecular structure (coordination numbers, Am-O and Am-C distances) of the different Am(III) formate species as a function of the pH to determine whether formate binds mono- or bidentate to the actinide ion. Furthermore, the spectroscopic results will be complemented by iterative transformation factor analysis, thermodynamic speciation calculations and quantum chemical calculations. The final result will help to improve the general understanding of actinide geochemistry.
The results will be presented at national and international conferences and meetings. Furthermore, a publication of the data in a peer review journal is planned.

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

JRP Identification
JRP nr: TALI-C05-16
JRP title: EXAFS study on the complexation of Am(III) with formate as a function of the pH-value
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: Technical University München
Other APF involved in the project: KIT-INE - Laboratories

Description of the work done at the associated pooled facility
Start date of the stay: 11/29/2015
End date of the stay: 12/2/2015
Quantity of access: 9
Access Unit: Shifts

Other APF visitors of the JRP during the stay
Visitor 2: Dr Andrej Skerencak-Frech (KIT-INE)
Visitor 3: Carsten Koke (University Heidelberg)
Visitor 4: Dr Alena Kremleva (Technical University München)