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Now showing items 13970-13989 of 39124
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(2003)the development of ideas on modern analogues for ophiolite complexes can be divided into three parts. In the first (1963 to 1972), ophiolites were mainly viewed as on-land analogues of the crust and upper mantle formed at ...
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(2003)Two section types are established in the Chupa nappe of the Early Precambrian Belomorian mobile belt (BMB) of the Baltic shield: one in the Lake Verkhnee Pulongskoe area of the stratotype region (Chupa Complex) and the ...
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(PANGAEA, 2017-08-29)The database contains glacier outlines from 1986-2000-2014. During the investigation Landsat (Landsat 5 TM, Landsat 7 ETM+, Landsat 8 OLI) and SPOT satellite imagery were analyzed to generate glacier outlines using manual ...
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(2001)The process of formation of colloidal and metacolloidal minerals, which can give rise to monodisperse systems, is considered in the context of supramolecular crystallization. We present data on synthesis of monodisperse ...
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(1999)The effect of temperature on the adsorption of H+ onto corundum was investigated experimentally by conducting potentiometric titrations at 25, 30, 40, 50, 60 and 70°C. These titrations were used to determine apparent acidity ...
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(2003)The surface of arsenopyrite was characterized after acidic, oxidative leaching in the presence of the bacterial species Thiobacillus ferrooxidans. Polished single-crystal grains of arsenopyrite were reacted for 1, 2, and ...
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(1999)Colloidal hematite (α-Fe2O3) is used as model solid to investigate the kinetic effect of specific adsorption interactions on the chemical reduction of uranyl (UVIO22+) by ferrous iron. Acid-base titrations and Fe(II) and ...
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(2001)The empirical rate laws formulated to describe the dissolution rates of oxide minerals include the surface charge concentration that results from the protonation and deprotonation of surface functional groups. Previous ...
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(2005)The surface charge density of colloidal SiO2 (Aerosil 380) was measured in alkali chloride (0.067 and 0.20 M LiCl, NaCl, and KCl) and alkaline earth chloride (0.067 M MgCl2, CaCl2, SrCl2, BaCl2) solutions. Measurements ...
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(1998)The isoelectric points, pHi.e.p., of ZnS, PbS, CuFeS2, FeS, FeS2, NiS2, CoS2, and MnS2 in NaCl supported electrolyte solutions are estimated to be between pH 3.3 and 0.6, with most of the isoelectric points below pH 2. The ...
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(1998)This study characterizes the surface chemistry and morphology of poorly crystalline iron sulfides precipitated in a chemically defined growth media for sulfate-reducing bacteria. The precipitates were analyzed by X-ray ...
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(2004)The surface binding site characteristics and Ni sorptive capacities of synthesized hydrous Mn oxyhydroxides experimentally conditioned to represent three hydrological conditions-MnOXW, freshly precipitated; MnOXD, dried ...
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(2002)Tetragonal FeS1-x mackinawite, has been synthesized by reacting metallic iron with a sodium sulfide solution and characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), transmission Mossbauer ...
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(2005)Disordered mackinawite, FeS, is the first formed iron sulfide in ambient sulfidic environments and has a highly reactive surface. In this study, the solubility and surface chemistry of FeS is described. Its solubility in ...
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(2001)Adsorption of organic ligands to the surfaces of minerals is a ubiquitous environmental process that often regulates interfacial aqueous chemistry. In the current work, the infrared spectra of dicarboxylate ligands adsorbed ...
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(2002)''Two-line'' ferrihydrite samples precipitated and then exposed to a range of aqueous Zn solutions (10-5 to 10-3 M), and also coprecipitated in similar Zn solutions (pH 6.5), have been examined by Zn and Fe K-edge X-ray ...
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(2003)X-ray absorption near-edge spectroscopy (XANES) analysis of sorption complexes has the advantages of high sensitivity (10- to 20-fold greater than extended X-ray absorption fine structure [EXAFS] analysis) and relative ...
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(1996)Calcium and magnesium adsorb in near-stoichiometric proportions to dolomite over wide ranges in [Ca2+]2+], ionic strength, and solution composition pointing to minimal mixing of metal cations between the CaCO3 and MgCO3 ...
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(2005)We measured the adsorption of Cu(II) onto kaolinite from pH 3–7 at constant ionic strength. EXAFS spectra show that Cu(II) adsorbs as (CuO4Hn)n−6 and binuclear (Cu2O6Hn)n−8 inner-sphere complexes on variable-charge ≡AlOH ...
Now showing items 13970-13989 of 39124