Title: New Insights in the Formation Processes of Pu(IV) Colloids
Authors: WALTHER C.ROTHE J.BRENDEBACH B.FUSS M.ALTMAIER M.MARQUARDT C. M.BUECHNER S.CHO H. R.YUN J.-I.SEIBERT ALICE
Citation: RADIOCHIMICA ACTA vol. 97 p. 199-207
Publisher: OLDENBOURG VERLAG
Publication Year: 2009
JRC N°: JRC52462
ISSN: 0033-8230
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC52462
DOI: 10.1524/ract.2009.1595
Type: Contributions to Conferences
Abstract: The high tendency of tetravalent plutonium to form polymeric complexes and colloids is well known but the exact processes underlying their formation are still controversially discussed. In the present work, the nucleation of small polynuclear hydroxide complexes, i.e. , ionic species containing more than one Pu ion, their aggregation and formation of larger colloids (polymers exceeding some 5 nm in size) and finally ripening processes of freshly formed amorphous Pu(IV) colloids towards more crystalline particles are investigated by use of a combination of various spectroscopic techniques. By electrospray mass-spectrometry small polymers such as dimers, trimers and tetramers containing mixed oxidation states of Pu were observed. These polymers might be responsible for the equilibration between the Pu(III)/Pu(IV) and the plutonyl species Pu(V)/Pu(VI) even in dilute solutions in the absence of colloids or precipitates.
JRC Institute:Institute for Transuranium Elements

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