Speaker
Mr
Artsiom Radkevich
(, Joint Institute for Power and Nuclear Research – Sosny, Belorussian Academy of Sciences, 220109 Мinsk, Belarus)
Description
The solubility of the Th(IV)/Fe(III) system has been studied as function of pH in the range 2.00-3.50. In the individual systems of thorium(IV) and iron(III) precipitation takes place due to formation of hydrolysis products. However, in the mixed Th(IV)/Fe(III) system precipitation of ferrihydrite takes place at low pH value, pH = 2.00, whereas at higher pH no precipitation was observed after 20 months. The mixed heteronuclear complex of composition [Th2Fe2(μ2-OH)8(H2O)12]10+ was formed in solution, with Th--Th, Th--Fe and Fe--Fe distances of 3.95 and 3.949; 3.42 and 3.4; 3.05 and 2.921 Å as determined by EXAFS and LAXS, respectively. Two and four line ferrihydrite was formed in solutions at low pH values, 2.00-2.30, as identified by X-ray diffraction (XRD). SEM analysis of these precipitates showed that some of them contained only iron, whereas the others contained both iron and thorium. Mixed Th/Fe system showed increased solubility what may affect the design of tanks for spent nuclear waste.
Primary authors
Mr
Artsiom Radkevich
(, Joint Institute for Power and Nuclear Research – Sosny, Belorussian Academy of Sciences, 220109 Мinsk, Belarus)
Dr
Daniel Lundberg
(Department of Chemistry, Swedish University of Agricultural Sciences, P.O.Box 7015, SE-756 51 Uppsala, Sweden)
Dr
Dmitri Davydov
(Joint Institute for Power and Nuclear Research – Sosny, Belorussian Academy of Sciences, 220109 Мinsk, Belarus)
Prof.
Ingmar Persson
(Department of Chemistry, Swedish University of Agricultural Sciences, P.O.Box 7015, SE-756 51 Uppsala, Sweden)
Dr
Lars Eriksson
(Department of Physical, Inorganic and Structural Chemistry, Stockholm University, SE-106 90 Stockholm, Sweden)
Ms
Natallia Torapava
(Department of Chemistry, Swedish University of Agricultural Sciences, P.O.Box 7015, SE-756 51 Uppsala, Sweden)
