Concept

Oxide mineral

Publications associées (32)

Products of abiotic U(VI) reduction by biogenic magnetite and vivianite

Rizlan Bernier-Latmani, Elena Suvorova Buffat, Harish Veeramani, Daniel Scott Alessi

Reductive immobilization of uranium by the stimulation of dissimilatory metal-reducing bacteria (DMRB) has been investigated as a remediation strategy for subsurface U(VI) contamination. In those environments, DMRB may utilize a variety of electron accepto ...

Elsevier2010

Akaogiite: An ultra-dense polymorph of TiO2 with the baddeleyite-type structure, in shocked garnet gneiss from the Ries Crater, Germany

Philippe Gillet

Akaogiite, an ultra-dense polymorph of TiO2 was encountered in heavily shocked garnet-cordierite-sillimanite gneiss in the Suevite breccia of the Ries meteorite impact crater in Germany. The chemical formula of akaogiite is TiO2, containing (wt%) TiO2 97.6 ...

2010

Enhancement of Arsenic(III) Sequestration by Manganese Oxides in the Presence of Iron(II)

Janet Gordon Hering

Mobilization of arsenic (As) in the subsurface environment can result in elevated concentrations of As in groundwater and potential human exposure and adverse health effects. Natural attenuation (i.e., sequestration) of As may, under appropriate geochemica ...

2009

Isotopic compositions of cometary matter returned by Stardust

Anders Meibom, François Robert

Hydrogen, carbon, nitrogen, and oxygen isotopic compositions are heterogeneous among comet 81P/Wild 2 particle fragments; however, extreme isotopic anomalies are rare, indicating that the comet is not a pristine aggregate of presolar materials. Nonterrestr ...

2006

Influence of Dissolved Sodium and Cesium on Uranyl Oxide Hydrate Solubility

Janet Gordon Hering

The solubility of uranium-containing minerals can control the mobility of uranium in contaminated soil and groundwater. The identity and solubility of these minerals are strongly influenced by solution composition. The influence of dissolved sodium and ces ...

2004

Melting experiments of a chondritic meteorite between 16 and 25 GPa: Implication for Na/K fractionation in a primitive chondritic Earth's mantle

Philippe Gillet

Melting experiments at high-pressure and temperature were conducted at pressures from 16 to 25 GPa using chondritic starting material but with slightly enhanced Na- and K-contents while keeping the chondritic Na/K ratio constant. The experiments revealed t ...

2004

The leaching behavior of cement stabilized air pollution control residues: A comparison of field and laboratory investigations

Christian Ludwig

The factors controlling leachate composition of cement stabilized air pollution control (APC) residues (41% APC residues, 22% cement, 3% Na2CO3, and 32% water, w/w) have been investigated both in the laboratory ansi in a pilot landfill. Batch leaching and ...

2001

Typology of recent groundwaters from different aquifer environments based on geogenic tracer elements

A key problem in environmental science and in engineering geology is the often incomplete understanding of the origin of dissolved components in groundwater. The dissolved contents of trace elements in groundwater are of special importance for groundwater ...

EPFL2001

Time scales for sorption - Desorption and surface precipitation of uranyl on goethite

Janet Gordon Hering

The sorption of uranium on mineral surfaces can significantly influence the fate and transport of uranium contamination in soils and groundwater. The rates of uranium adsorption and desorption on a synthetic goethite have been evaluated in batch experiment ...

2001

Immobilization of uranium in contaminated sediments by hydroxyapatite addition

Jeremy Samuel Arey

Batch equilibrations were performed to investigate the ability of hydroxyapatite (Ca5(PO4)3OH) to chemically immobilize U in two contaminated sediment samples having different organic carbon contents (123 and 49 g kg-1, respectively). Apatite additions low ...

1999

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