Search Results - "BROWN, Gordon E"

Environmental Speciation of Actinides by Maher, Kate, Bargar, John R, Brown, Gordon E

“…Although minor in abundance in Earth’s crust (U, 2–4 ppm; Th, 10–15 ppm) and in seawater (U, 0.003 ppm; Th, 0.0007 ppm), light actinides (Th, Pa, U, Np, Pu,…”
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Kinetics and Products of Chromium(VI) Reduction by Iron(II/III)-Bearing Clay Minerals by Joe-Wong, Claresta, Brown, Gordon E., Maher, Kate

“…Hexavalent chromium is a water-soluble pollutant, the mobility of which can be controlled by reduction of Cr­(VI) to less soluble, environmentally benign…”
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Environmental Transformations of Silver Nanoparticles: Impact on Stability and Toxicity by Levard, Clément, Hotze, E. Matt, Lowry, Gregory V, Brown, Gordon E

“…Silver nanoparticles (Ag-NPs) readily transform in the environment, which modifies their properties and alters their transport, fate, and toxicity. It is…”
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Ordered ferrimagnetic form of ferrihydrite reveals links among structure, composition, and magnetism by Michel, F. Marc, Barrón, Vidal, Torrent, José, Morales, María P, Serna, Carlos J, Boily, Jean-François, Liu, Qingsong, Ambrosini, Andrea, Cismasu, A. Cristina, Brown, Gordon E. Jr

“…The natural nanomineral ferrihydrite is an important component of many environmental and soil systems and has been implicated as the inorganic core of ferritin…”
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Effect of Chloride on the Dissolution Rate of Silver Nanoparticles and Toxicity to E. coli by Levard, Clément, Mitra, Sumit, Yang, Tiffany, Jew, Adam D, Badireddy, Appala Raju, Lowry, Gregory V, Brown, Gordon E

“…Pristine silver nanoparticles (AgNPs) are not chemically stable in the environment and react strongly with inorganic ligands such as sulfide and chloride once…”
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Size-Controlled Dissolution of Organic-Coated Silver Nanoparticles by Ma, Rui, Levard, Clément, Marinakos, Stella M, Cheng, Yingwen, Liu, Jie, Michel, F. Marc, Brown, Gordon E, Lowry, Gregory V

“…The solubility of Ag NPs can affect their toxicity and persistence in the environment. We measured the solubility of organic-coated silver nanoparticles (Ag…”
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Arsenic(III) and Arsenic(V) Speciation during Transformation of Lepidocrocite to Magnetite by Wang, Yuheng, Morin, Guillaume, Ona-Nguema, Georges, Brown, Gordon E

“…Bioreduction of As­(V) and As-bearing iron oxides is considered to be one of the key processes leading to arsenic pollution in groundwaters in South and…”
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Properties of impurity-bearing ferrihydrite II: Insights into the surface structure and composition of pure, Al- and Si-bearing ferrihydrite from Zn(II) sorption experiments and Zn K-edge X-ray absorption spectroscopy by Cismasu, A. Cristina, Levard, Clément, Michel, F. Marc, Brown, Gordon E.

“…Naturally occurring ferrihydrite often contains impurities such as Al and Si, which can impact its chemical reactivity with respect to metal(loid) adsorption…”
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Sulfidation Mechanism for Zinc Oxide Nanoparticles and the Effect of Sulfidation on Their Solubility by Ma, Rui, Levard, Clément, Michel, F. Marc, Brown, Gordon E, Lowry, Gregory V

“…Environmental transformations of nanoparticles (NPs) affect their properties and toxicity potential. Sulfidation is an important transformation process…”
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EXAFS Analysis of Arsenite Adsorption onto Two-Line Ferrihydrite, Hematite, Goethite, and Lepidocrocite by Ona-Nguema, Georges, Morin, Guillaume, Juillot, Farid, Calas, Georges, Brown, Gordon E

“…The modes of As(III) sorption onto two-line ferrihydrite (Fh), hematite (Hm), goethite (Gt), and lepidocrocite (Lp) have been investigated under anoxic…”
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An Early-Branching Microbialite Cyanobacterium Forms Intracellular Carbonates by Couradeau, Estelle, Benzerara, Karim, Gérard, Emmanuelle, Moreira, David, Bernard, Sylvain, Brown, Gordon E., López-García, Purificación

“…Cyanobacteria have affected major geochemical cycles (carbon, nitrogen, and oxygen) on Earth for billions of years. In particular, they have played a major…”
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Sulfidation Processes of PVP-Coated Silver Nanoparticles in Aqueous Solution: Impact on Dissolution Rate by Levard, Clément, Reinsch, Brian C, Michel, F. Marc, Oumahi, Camella, Lowry, Gregory V, Brown, Gordon E

“…Despite the increasing use of silver nanoparticles (Ag-NPs) in nanotechnology and their toxicity to invertebrates, the transformations and fate of Ag-NPs in…”
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Ni speciation in a New Caledonian lateritic regolith: A quantitative X-ray absorption spectroscopy investigation by Dublet, Gabrielle, Juillot, Farid, Morin, Guillaume, Fritsch, Emmanuel, Fandeur, Dik, Ona-Nguema, Georges, Brown, Gordon E.

“…Changes in Ni speciation in a 64m vertical profile of a New Caledonian saprolitic–lateritic regolith developed over ultramafic rocks under tropical weathering…”
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Properties of impurity-bearing ferrihydrite I. Effects of Al content and precipitation rate on the structure of 2-line ferrihydrite by Cismasu, A. Cristina, Michel, F. Marc, Stebbins, Jonathan F., Levard, Clément, Brown, Gordon E.

“…The association of Al with ferrihydrite (Fh) may have a considerable effect on the composition, structure, and surface properties of Fh nanoparticles, and thus…”
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Properties of impurity-bearing ferrihydrite III. Effects of Si on the structure of 2-line ferrihydrite by Cismasu, A. Cristina, Michel, F. Marc, Tcaciuc, A. Patricia, Brown, Gordon E.

“…Siliceous ferrihydrites are abundant nanoparticles in natural environments. Although it is well known that the physical properties of ferrihydrite are affected…”
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Distinctive Arsenic(V) Trapping Modes by Magnetite Nanoparticles Induced by Different Sorption Processes by Wang, Yuheng, Morin, Guillaume, Ona-Nguema, Georges, Juillot, Farid, Calas, Georges, Brown, Gordon E

“…Arsenic sorption onto iron oxide spinels such as magnetite may contribute to arsenic immobilization at redox fronts in soils, sediments, and aquifers, as well…”
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XANES Evidence for Oxidation of Cr(III) to Cr(VI) by Mn-Oxides in a Lateritic Regolith Developed on Serpentinized Ultramafic Rocks of New Caledonia by Fandeur, Dik, Juillot, Farid, Morin, Guillaume, Olivi, Luca, Cognigni, Andrea, Webb, Samuel M, Ambrosi, Jean-Paul, Fritsch, Emmanuel, Guyot, François, Brown, Jr, Gordon E

“…Although several laboratory studies showed that Mn-oxides are capable of oxidizing Cr(III) to Cr(VI), very few have reported evidence for such a reaction in…”
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Uranium Speciation As a Function of Depth in Contaminated Hanford Sediments - A Micro-XRF, Micro-XRD, and Micro- And Bulk-XAFS Study by Singer, David M, Zachara, John M, Brown Jr, Gordon E

“…The distribution and speciation of U and Cu in contaminated vadose zone and aquifer sediments from the U.S. DOE Hanford site (300 Area) were determined using a…”
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Molecular-level modes of As binding to Fe(III) (oxyhydr)oxides precipitated by the anaerobic nitrate-reducing Fe(II)-oxidizing Acidovorax sp. strain BoFeN1 by Hohmann, Claudia, Morin, Guillaume, Ona-Nguema, Georges, Guigner, Jean-Michel, Brown, Gordon E., Kappler, Andreas

“…Sorption of contaminants such as arsenic (As) to natural Fe(III) (oxyhydr)oxides is very common and has been demonstrated to occur during abiotic and biotic…”
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Chemical and Reactive Transport Processes Associated with Hydraulic Fracturing of Unconventional Oil/Gas Shales by Jew, Adam D., Druhan, Jennifer L., Ihme, Matthias, Kovscek, Anthony R., Battiato, Ilenia, Kaszuba, John P., Bargar, John R., Brown, Gordon E.

“…Hydraulic fracturing of unconventional oil/gas shales has changed the energy landscape of the U.S. Recovery of hydrocarbons from tight, hydraulically fractured…”
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