Title: Reduction of Pu(VI) by Fe
Authors: CARBOL PaulWEGEN DetlefWISS ThierryJANSSEN ARNENICHOLL AdrianCREMER BertMALMBECK RikardVAN WINCKEL StefaanAPOSTOLIDIS ChristosALVAREZ SARANDES LAVANDERA RafaelHIMBERT JeromeCUI Daqing
Citation: 4th Annual Workshop Proceedings of the EC 7th FW CP "Redox Phenomena Controlling Systems" p. 149 - 168
Publisher: KIT Scientific Publishing
Publication Year: 2012
JRC N°: JRC69267
ISBN: 978-3-86644-921-3
ISSN: 1869-9669
URI: http://digbib.ubka.uni-karlsruhe.de/volltexte/1000030358
http://publications.jrc.ec.europa.eu/repository/handle/JRC69267
DOI: 10.5445/KSP/1000030358
Type: Articles in periodicals and books
Abstract: The main purpose of this task (part of deliverable D6.1) is to study the immobilization/ remobilization of Pu under simulated near-field condi¬tions: Fe as iron coupon mimic the canister material, and magnetite as the relevant crystalline rock fracture filling Fe(II) minerals found at for example ÄSPÖ Hard Rock Laboratory. In collaboration between ITU and Studsvik, solutions of hexavalent Pu were exposed to iron coupons, either freshly polished Fe(0) or pre-corroded and coated with Fe3O4, under anoxic conditions. Plutonium and Fe concentration in solution as a function of time was monitored by sector field inductive coupled plasma mass spectrometry (SF-ICP-MS) and γ-spectrometry. Plutonium precipitate on the iron phases were characterized by scanning electron microscope coupled with energy dispersive X-ray spectroscopy (SEM-EDX) and α-track analysis. It can be concluded that only 1 % of the added amount of Pu(VI) was reduced by Fe3O4 after a contact time of 4 months. There was no Pu(VI) reduction on the Fe coupons. Considering the small negative DG-values and the small amount of Pu(VI) reduced on the magnetite surface it can be concluded that it is a relatively slow reduction reaction.
JRC Directorate:Nuclear Safety and Security

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