0000000000416622
AUTHOR
Steffen Happel
showing 4 related works from this author
Improving the performances of Diffusive Gradient in Thin-films (DGT) technique to measure the labile uranyl concentration in environmental waters by …
2022
Uranium (U) presents a unique challenge for ecological risk assessments around installations related to the nuclear fuel cycle because of both chemical and radiological toxicity. Their relative importance depends on the chemical speciation and isotopic composition of the radionuclide, the latter being strongly correlated to its natural or anthropogenic origin (enriched or depleted U) [1]. In this framework, the Diffusive Gradient in Thin-films (DGT) technique is an appealing tool for monitoring the water quality around uranium processing plants, nuclear facilities or mining areas. Indeed, the DGT sampling allows to preconcentrate in situ the labile U(VI) species, allowing to simultaneously …
Determination of distribution coefficients (Kd) of various radionuclides on UTEVA resin
2016
Abstract Using radioisotope markers the distribution coefficients (Kd) of the following elements In, Sn, Sb, Te, Bi, Co, Fe, Nb, Sr, Ba, Ag, Cd, Zr, Hf and Ti were determined with different concentrations of HCl, H2SO4 and HNO3 for the extraction chromatographic resin Uranium and TEtraValent Actinides (UTEVA). This data can be used for separation of elements in complex mixtures, as well as for correct assessment of the elements chemistry with higher valences such as 3, 4, 5 or 6.
Behavior of Actinium, Alkaline, and Rare Earth Elements in Sr-Resin/Mineral Acid Systems
2015
In this work, the interactions between the divalent alkaline earth elements (AEE) (Sr, Ba, Ra), the trivalent rare earth elements (REE) (Ce-Lu, Y), and Ac(III) with Sr-resin were investigated in the presence of HNO3, HCl, HBr, HClO4, and HPF6. Distribution coefficients of these ions on the Sr-resin were determined under batch-loading conditions. Lastly, online column separations were performed to demonstrate the utility of these systems. Substantial differences in the behavior of the ions in solutions comprised of the five different acids were observed. These differences can partly be explained by a combination of ion exchange (primary) and extraction (solvation) mechanisms. From a practica…
Behavior of Actinium, Alkaline, and Rare Earth Elements in Sr-Resin/Mineral Acid Systems
2015
In this work, the interactions between the divalent alkaline earth elements (AEE) (Sr, Ba, Ra), the trivalent rare earth elements (REE) (Ce-Lu, Y), and Ac(III) with Sr-resin were investigated in the presence of HNO3, HCl, HBr, HClO4, and HPF6. Distribution coefficients of these ions on the Sr-resin were determined under batch-loading conditions. Lastly, online column separations were performed to demonstrate the utility of these systems. Substantial differences in the behavior of the ions in solutions comprised of the five different acids were observed. These differences can partly be explained by a combination of ion exchange (primary) and extraction (solvation) mechanisms. From a practica…