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Now showing items 7763-7782 of 39002
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(2000)The purpose of this study is to delineate the mechanism of isotopic exchange between zeolites and fluid. Two size fractions of analcime were exchanged with water vapor at 400°C and the isotopic change of framework oxygen ...
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(2003)Polythionates (SxO62-) are important in redox transformations involving many sulfur compounds. Here we investigate the oxidation kinetics and mechanisms of trithionate and tetrathionate oxidation between pH 0.4 and pH 2 ...
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KINETICS AND MECHANISM OF SURFACE REACTION OF SALICYLATE ON ALUMINA IN COLLOIDAL AQUEOUS SUSPENSION (2000)The reaction kinetics of salicylate with Al(III) in aqueous solution and at the colloidal alumina-water interface was studied by stopped-flow laser fluorescence spectroscopy. Temporal evolution of the fluorescence spectra ...
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(2003)The oxidation kinetics of trithionate (S3O 62-) and tetrathionate (S4O 62-) with hydroxyl radicals (OH*) have been investigated in systems analogous to acid mine drainage (AMD) environments. The discovery of hydroxyl radical ...
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(1995)Monitoring and restoration activities at low-level radioactive waste disposal sites have identified complicated mixtures of inorganic and organic contaminants in soil and groundwater. Metallic contaminants are generally ...
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(1998)This study was conducted to develop a model for the precipitation rate of calcite under varying CO2 partial pressures and concentrations of dissolved organic carbon (DOC). Precipitation rates of calcite were measured in ...
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(2001)The paper presents an analysis of preexisting experimental data on the kinetics and mechanism of congruent dissolution of feldspars. The analysis demonstrates that feldspar dissolution is controlled by surface reactions ...
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(2003)The surface speciation and leaching kinetics of 38- to 75-μm sphalerite (0.45 wt.% Fe) particles reacted in O2 purged perchloric acid (at pH 1.0) at 25, 40, 60, and 85 °C over a leach period of 144 h were investigated. In ...
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(2004)In order to characterize the effect of ascent rate on the kinetics of bubble nucleation in a rhyolitic magma, we performed three series of experiments decompressed at 1000, 167, or 27.8 kPa/s. The experiments were carried ...
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(2006)The impeding effects of organic substances on the crystallization of Al precipitation products have been studied for more than three decades. However, the impacts of organics-induced structural perturbation and the resultant ...
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(2000)This study links classical crystal growth theory with observations of microscopic surface processes to quantify the dependence of calcite growth on supersaturation, σ, and show relationships to the same dependencies often ...
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(1998)To characterize the influence of ionic strength on the kinetics of calcite precipitation from seawater solutions we carried out a set of experiments at four different ionic strengths (I = 0.10; 0.34; 0.55; 0.93 m) in ...
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(2004)The kinetics of calcite precipitation induced in response to the hydrolysis of urea by Bacillus pasteurii at different temperatures in artificial groundwater (AGW) was investigated. The hydrolysis of urea by B. pasteurii ...
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(2003)Large quantities of methane hydrate are present in marine sediment. When methane hydrate is exposed or released to seawater, it dissolves in seawater or dissociates into methane gas and water. There was some confusion in ...
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(Федеральное государственное бюджетное учреждение науки Геофизический центр Российской академии наук, 2017)The study is focused on the results of kinetic analysis of processes of crystallization and melting of hydrates synthesized in model systems ``natural gas + water'' and ``natural gas + asphaltene-resin-paraffin deposits ...
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(2004)Hydrogen-deuterium exchange experiments were performed at temperatures between 973 and 1223 K on a Dora Maira pyrope and on two pyrope samples from mantle xenoliths. The Fourier transform infrared (FTIR) spectra of hydrogen ...
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(2000)Evaporation is a process that caused chemical fractionation in the solar nebula. The evaporation rates of meteorite-forming minerals and silicate melts are key parameters for constraining the timescale of high temperature ...
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(2000)The dissolution kinetics and isotopic composition of Sr released during the weathering of biotite and phlogopite were measured under experimental conditions at pH ~ 3 and 25°C. Although the overall release of Sr was ...
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(1999)Effects of the organic acid (OA) anions, oxalate and citrate, on the solubility and dissolution kinetics of feldspars (labradorite, orthoclase, and albite) at 80°C and of quartz at 70°C were investigated at pH 6 in separate ...
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(1995)The kinetics of the fast precipitation reaction between aqueous iron(II) and dissolved sulfide at 25°C can be interpreted in terms of two competing reactions. The first may be represented byFe2+ + H2S -> FeS(s) + 2H+.- ...
Now showing items 7763-7782 of 39002