title: Sorption of silicates on goethite, hematite, and magnetite: experiments and modelling.
abstract: Sorption of H(4)SiO(4) (including experiments as a function of time, K(d) measurement with different m/v ratios and sorption edges) onto different iron (hydro)oxides as goethite (alpha-FeOOH), hematite (alpha-Fe(2)O(3)), and magnetite (Fe(3)O(4)) has been studied with concentration of silicates under solubility limit. A surface complexation model has been used to account for sorption edge of silicates onto these iron oxide surfaces. It reveals that two types of surface complex namely FeH(3)SiO(4) and FeH(2)SiO(4)(-), are needed to describe properly the experimental observations.
authors.affiliation: Université de Nice-Sophia-Antipolis, Laboratoire de Radiochimie, Sciences Analytiques et Environnement, 28 avenue Valrose, F-06108 Nice Cedex 2, France. jordan@unice.fr
authors.forename: Norbert
authors.initials: N
authors.lastname: Jordan
authors.forename: Nicolas
authors.initials: N
authors.lastname: Marmier
authors.forename: Claire
authors.initials: C
authors.lastname: Lomenech
authors.forename: Eric
authors.initials: E
authors.lastname: Giffaut
authors.forename: Jean-Jacques
authors.initials: JJ
authors.lastname: Ehrhardt
mesh_terms: D000327:Adsorption; D005290:Ferric Compounds / Q000737:chemistry*; D052203:Ferrosoferric Oxide / Q000737:chemistry*; D058085:Iron Compounds / Q000737:chemistry*; D008903:Minerals; D008956:Models, Chemical; D017640:Silicates / Q000737:chemistry*; D013499:Surface Properties
chemical_list: D005290:Ferric Compounds; D058085:Iron Compounds; D008903:Minerals; D017640:Silicates; C094886:goethite; C000499:ferric oxide; D052203:Ferrosoferric Oxide