title: Oxyhydroxy Silicate Colloids: A New Type of Waterborne Actinide(IV) Colloids.
abstract: At the near-neutral and reducing aquatic conditions expected in undisturbed ore deposits or in closed nuclear waste repositories, the actinides Th, U, Np, and Pu are primarily tetravalent. These tetravalent actinides (AnIV) are sparingly soluble in aquatic systems and, hence, are often assumed to be immobile. However, AnIVcould become mobile if they occur as colloids. This review focuses on a new type of AnIVcolloids, oxyhydroxy silicate colloids. We herein discuss the chemical characteristics of these colloids and the potential implication for their environmental behavior. The binary oxyhydroxy silicate colloids of AnIVcould be potentially more mobile as a waterborne species than the well-known mono-component oxyhydroxide colloids.
authors.affiliation: Institute of Resource Ecology Helmholtz-Zentrum Dresden-Rossendorf P.O. Box 51 01 19 01314 Dresden Germany.
authors.forename: Harald
authors.initials: H
authors.lastname: Zänker
authors.affiliation: Institute of Resource Ecology Helmholtz-Zentrum Dresden-Rossendorf P.O. Box 51 01 19 01314 Dresden Germany.
authors.forename: Stephan
authors.initials: S
authors.lastname: Weiss
authors.affiliation: Institute of Resource Ecology Helmholtz-Zentrum Dresden-Rossendorf P.O. Box 51 01 19 01314 Dresden Germany.
authors.forename: Christoph
authors.initials: C
authors.lastname: Hennig
authors.affiliation: Institute of Resource Ecology Helmholtz-Zentrum Dresden-Rossendorf P.O. Box 51 01 19 01314 Dresden Germany.
authors.forename: Vinzenz
authors.initials: V
authors.lastname: Brendler
authors.affiliation: Institute of Resource Ecology Helmholtz-Zentrum Dresden-Rossendorf P.O. Box 51 01 19 01314 Dresden Germany.
authors.forename: Atsushi
authors.initials: A
authors.lastname: Ikeda-Ohno
keywords: actinides; colloids; environmental chemistry; silicates; spectroscopic methods