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Now showing items 18822-18841 of 41226
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(2002)X-ray absorption fine structure (XAFS) measurements was used at the U L3-edge to directly determine the pH dependence of the cell wall functional groups responsible for the absorption of aqueous UO22+ to Bacillus subtilis ...
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(2003)X-ray absorption fine structure (XAFS) spectroscopic analysis at the As, Se, and Mn K-edges was used to study arsenate [As(V)O-4(3-)] and selenite [Se(IV)O-3(2-)] sorption complexes on the synthetic hydrous manganese oxides ...
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(1999)Sorption processes typically control trace metal concentrations in aquatic systems. To illustrate the impact of various types of surface sites on metal ion sorption behavior, Co(II) and Sr(II) sorption by several clay ...
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(2003)We present X-ray absorption near-edge structure (XANES) spectroscopy of 11 silicate and aluminosilicate minerals and two glasses at the SiK and SiL2,3, and OK edges. The similar nearest-neighbor environments lead to similar ...
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(2002)X-ray absorption spectroscopy (XAS) has developed into a powerful tool for the study of all types of materials since the early 1970s, when strong sources such as synchrotrons became available from which experimental spectra ...
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(2002)We report results from in situ extended X-ray absorption fine structure (EXAFS) spectroscopy studies of Cu(II) and Zn(II) complexes forming at the calcite surface following adsorption from preequilibrated calcite-saturated ...
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(2000)Sulfate is one of the most abundant inorganic ligands in the lithosphere and hydrosphere. It plays a major role in mediating mineral dissolution and precipitation, crystal growth, mineral–water and air–water interfacial ...
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(2004)The high-pressure behaviour of millerite NiS up to 34.7 GPa was studied using single-crystal X-ray diffraction techniques. Under ambient pressure, 8.3, 19.2 and 26.8 GPa crystal-structure determinations were performed. No ...
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(2002)We synthesized compounds with stoichiometry of natural brabantite M2+Th(PO4)2 with M2+=Ca, Cd, Sr, Pb, Ba at 1 bar, 1200 °C and 2.5 kbar, 700 °C. Those compounds were studied by powder X-ray diffraction and electron ...
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(1995)Angle resolved X-ray photoelectron spectroscopy (ARXPS) of air-oxidized pyrrhotite (Fe7S8) surfaces reveals two distinctive compositional zones. The outer most zone is composed of iron oxyhydroxide, whereas the underlying ...
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(2000)Polished albite single crystals were dissolved in flow or semi-batch reactors containing solutions at pH 2.9+/-0.1 at 5°, 50°, and 90°C until steady state dissolution was achieved. At steady state, all effluent solutions ...
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(2006)Cleaved surfaces of dolomite were studied using ex-situ X-ray photoelectron spectroscopy (XPS) following exposure of the surfaces to various experimental conditions. Dolomite samples exposed to air, to a highly undersaturated ...
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(1995)Samples of natural pyrrhotite and pyrite were fractured within the analytical chamber of an X-ray photoelectron spectrometer. The pristine mineral surfaces were then exposed, in the absence of oxygen, to total doses of ...
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(2001)The crystal structure of intermediate incommensurate tridymite was refined at 150 °C from powder data. Upon cooling from above 220 °C, the basic structure with space group symmetry C2221 gradually distorted from orthorhombic ...
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(2002)Two MgAl2O4 stoichiometric spinel crystals, one natural and one synthetic, were heated from 25 to 950 °C and studied in situ by single-crystal X-ray diffraction. The natural crystal, quenched from 850 °C, was further ...
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(2002)The first direct measurements are reported for the structure of the hydrated La3+ ion in an aqueous solution (containing 0.007 m La) over a range of temperatures from 25 to 300degreesC and pressures LIP to 1600 bars. The ...
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(2002)With a penetration depth ranging from microns to millimeters, Ångstrom-wavelength X-rays are an ideal probe for studying atomic-scale buried structures found in the natural environment, such as impurities in minerals and ...
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(1999)The location and orientation of arsenite incorporated at the CaCO3 (1014) cleavage surface from a dilute aqueous solution was examined with the X-ray standing wave (XSW) technique. The high coherent fractions measured for ...
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(1989)We experimentally studied the solubility of titanium in a basalt melt at 1200° to 1300° C both in air (pO 2 = 0.21) and in a helium atmosphere. In the latter case, we determined the partial pressure of oxygen which, depending ...
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(2003)Fe K-edge X-ray absorption near edge structure (XANES) spectra were recorded for a series of anorthite-diopside eutectic glasses containing 1 wt% 57 Fe2O3 quenched from melts equilibrated over a range of oxygen fugacities ...
Now showing items 18822-18841 of 41226