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Browsing ELibrary by Title
Now showing items 6331-6350 of 21934
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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 ...
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(2001)Rates of steady exchange of oxygens between bulk solution and sites in the GaO4Al12(OH)24(H2O)127+(aq) (GaAl12) aqueous complex were determined over the temperature range of 301 to 317 K and 4.1 < pH < 4.9 using 17O-nuclear ...
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(1994)The release of silica and Pb from zircon by the thermal evaporation technique is shown to relate to the conversion of zircon to a porous baddeleyite structure. The zircon-baddeleyite reaction occurs at a sharp reaction ...
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(1988)Analysis of kinetics of filtration of dispersions through rock walls in oil-well drilling is becoming important for evaluating and developing methods of control of properties of such systems in order to assume stability ...
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(1993)Bulk petroleum generation by programmed-temperature pyrolysis of immature (Rr = 0.48%) Posidonia (Toarcian) Shale samples at heating rates of 0.1, 0.7, and 5.0 K/min has been studied comparatively under open- and closed-system ...
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(1995)A series of oxic and anoxic incubations examined the decay of two marine phytoplankton, the diatom Thalassiosira weissflogii and the coccoid cyanobacterium Synechococcus sp, in flow-through systems without macrozooplankton ...
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(1997)H2S acts as an oxidizing agent in natural systems and compares with molecular oxygen as an electron acceptor. The experimentally determined lowest unoccupied molecular orbital (LUMO) for H2S is -1.1 eV, which means that ...
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(1997)A kinetic study of the reactionFeS(s) + H2S(aq) = FeS2 + H2(g) where FeS is precipitated FeS, H2S(aq) is aqueous H2S, FeS2 is pyrite, and H2(g) is hydrogen gas, shows that the rate between 25 and 125°C can be described by ...
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(2001)-The variation in Fe-oxide reactivity was investigated by studying the kinetics of bulk reductive dissolution of a suite of synthetic Fe-oxides in 10 mM ascorbic acid at pH 3. The Fe-oxides comprised three different ...
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(1997)The rate of rhodochrosite (MnCO3) crystal growth in NaCl solutions has been measured, far from equilibrium and at 25°C, using a constant-composition method. Rates are not simply related to supersaturation (Ω) but also ...
Now showing items 6331-6350 of 21934