Incorporation versus adsorption: substitution of Ca2+ by Eu3+ and Cm3+ in aragonite and gypsum

Autor:	Horst Geckeis, Clemens Walther, Thorsten Stumpf, Thomas Fanghänel, Moritz Schmidt
Rok vydání:	2009
Předmět:	Inorganic Chemistry Coordination sphere Adsorption Mineral Chemistry Aragonite Inorganic chemistry engineering Actinide engineering.material Spectroscopy Solid solution Ion
Zdroj:	Dalton Transactions. :6645
ISSN:	1477-9234 1477-9226
Popis:	The aim of the present work is to understand the interaction behaviour of trivalent f-elements with Ca2+-bearing mineral phases on a molecular level. This is achieved by use of time-resolved laser fluorescence spectroscopy (TRLFS) with Eu3+ and Cm3+ as atomic sensors on a trace concentration level. These ions are of special interest as models for trivalent actinides (e.g., Cm(III), Am(III) or Pu(III)) which strongly contribute to radiotoxicity in high level nuclear waste. Results from TRLFS with these trivalent ions show a significantly different mode of interaction in the two cases: while in aragonite only structural incorporation is observed, on gypsum nothing but inner-sphere surface complexes can be found. This shows how the anions forming the coordination sphere of the foreign ion control the formation of solid solutions as opposed to adsorption complexes.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::faec5edf80758443aa9129466db1eb04 https://doi.org/10.1039/b822656c Zobrazit plný text záznamu