title: Behaviour of (99)Tc in aqueous solutions in the presence of iron oxides and microorganisms.
abstract: A set of experiments was performed to determine the factors that influence TcO4(-) interaction with Fe-bearing minerals and to explore the effect of microbial activity on the behaviour of Tc(VII) in solution, in the presence of iron oxides under oxidizing medium. Gradual sorption of TcO4(-) (aq) onto wustite/magnetite was observed under alkaline conditions (pH 8-9). No pronounced effect of TcO4(-) (aq) interaction with hematite was observed in the investigating alkaline systems. At low pH values (2.7-4.5), TcO4(-) retention on hematite increases, suggesting that the process is dependent on pH. Sorption of (99)Tc (VII) onto hematite at pH 7.6-8.0 was achieved because of the presence of specific microorganisms.
authors.affiliation: Center for Physical Sciences and Technology, Savanorių ave. 231, LT-02300 Vilnius, Lithuania. Electronic address: ruta@ar.fi.lt.
authors.forename: Rūta
authors.initials: R
authors.lastname: Druteikienė
authors.affiliation: Center for Physical Sciences and Technology, Savanorių ave. 231, LT-02300 Vilnius, Lithuania.
authors.forename: Benedikta
authors.initials: B
authors.lastname: Lukšienė
authors.affiliation: Nature Research Center, Akademijos str. 2, LT-08412 Vilnius, Lithuania.
authors.forename: Dalia
authors.initials: D
authors.lastname: Pečiulytė
authors.affiliation: Center for Physical Sciences and Technology, Savanorių ave. 231, LT-02300 Vilnius, Lithuania.
authors.forename: Kęstutis
authors.initials: K
authors.lastname: Mažeika
authors.affiliation: Center for Physical Sciences and Technology, Savanorių ave. 231, LT-02300 Vilnius, Lithuania.
authors.forename: Arūnas
authors.initials: A
authors.lastname: Gudelis
authors.affiliation: Center for Physical Sciences and Technology, Savanorių ave. 231, LT-02300 Vilnius, Lithuania.
authors.forename: Dalis
authors.initials: D
authors.lastname: Baltrūnas
mesh_terms: D000327:Adsorption; D001419:Bacteria / Q000737:chemistry / Q000528:radiation effects; D005290:Ferric Compounds / Q000737:chemistry*; D005658:Fungi / Q000737:chemistry / Q000528:radiation effects; D010084:Oxidation-Reduction; D012588:Scintillation Counting; D013670:Sodium Pertechnetate Tc 99m / Q000737:chemistry* / Q000378:metabolism; D012988:Soil Microbiology; D012990:Soil Pollutants, Radioactive / Q000737:chemistry*
chemical_list: D005290:Ferric Compounds; D012990:Soil Pollutants, Radioactive; C000499:ferric oxide; D013670:Sodium Pertechnetate Tc 99m
keywords: Hematite; Microorganism; Technetium; Wustite/magnetite