Title: Hydrolysis of Plutonium(IV) in Acidic Solutions - No Effect of Hydrolysis on Absorption-spectra of Mononuclear Hydroxide Complexes
Authors: WALTHER C.CHO H. R.MARQUARDT C. M.NECK V.SEIBERT AliceYUN J.-I.FANGHAENEL THOMAS
Citation: RADIOCHIMICA ACTA vol. 95 p. 7-16
Publisher: OLDENBOURG VERLAG
Publication Year: 2007
JRC N°: JRC42504
ISSN: 0033-8230
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC42504
DOI: 10.1524/ract.2007.95.1.7
Type: Articles in Journals
Abstract: Tetravalent plutonium readily undergoes hydrolysis even in highly acidic aqueous solutions. In the past, many attempts were made to quantify hydrolysis species by means of optical absorption spectroscopy. In the present work solutions ranging from 10-5 M to 10-2 M (total Pu) concentration in 0.5M HCl/NaCl (0.3 < pHc < 2.1) are carefully investigated by combining absorption-spectroscopy (UV-Vis, liquid core waveguide capillary) and laser-induced breakdown detection, with special emphasis on the limited solubility of Pu(IV). The results clearly indicate that all changes in the absorption spectra originate from the formation of Pu-polyspecies and colloids. The molar absorptivity of mononuclear Pu(IV) hydroxide complexes does not vary with increasing pHc and ongoing hydrolysis. The normalized absorption spectra of at least the first and the second hydroxide complex (Pu(OH)n 4-n n = 1, 2) do not differ from those of the hydrated Pu4+ ion.
JRC Institute:Institute for Transuranium Elements

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