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Now showing items 7823-7842 of 39124
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(2006)We used a mixed flow reactor system to determine the rate and infer a mechanism for arsenopyrite (FeAsS) oxidation by dissolved oxygen (DO) at 25 °C and circumneutral pH. Results indicate that under circumneutral pH ...
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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+.- ...
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(1999)Experiments measuring synthetic gibbsite dissolution rates were carried out using both a stirred-flow-through reactor and a column reactor at 25°C, and pH range of 2.5-4.1. All experiments were conducted under far from ...
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(1996)Diamonds containing nitrogen impurities in the form of singly substituted C centres (type Ib diamond) are rare in nature because lb nitrogen atoms aggregate to form A centres (type IaA diamond) during the long-term (∼0.5 ...
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(2002)The kinetics of Fe oxidation-reduction in two hydrous rhyolitic melts, one metaluminous and the other peralkaline, have been studied at 800 °C, 2kb, for melt water contents from ~5 wt% to saturation and fO2 between NNO-2 ...
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(2003)The presence of organic acids greatly affects the formation of Fe oxides and surface properties; however, the subsequent effect on the kinetics and mechanisms of Pb adsorption by the Fe oxides formed under the influence ...
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(2002)The kinetics of Mn(II) oxidation by the bacterium Leptothrix discophora SS1 was investigated in this research. Cells were grown in a minimal mineral salts medium in which chemical speciation was well defined. Mn(II) oxidation ...
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(1996)The reaction kinetics of dioctahedral muscovite and trioctahedral phlogopite and biotite were studied in aqueous solutions at pH 1-4 and room temperature. The experiments were performed in a reactor where mineral suspensions ...
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(1995)Three affinity-based rate models based upon physical growth mechanisms were used to fit surface-controlled precipitation rate data for calcite using a continuously stirred tank reactor in NaOH-CaCl2-CO2-H2O solutions at ...
Now showing items 7823-7842 of 39124