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Browsing ELibrary by Title
Now showing items 6333-6352 of 21934
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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 ...
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(1988)The oxidation of the main gold carriers in sulfide deposits was studied by bubbling oxygen through suspensions of them. We used both natural and synthetic sulfides and, while growing the latter, added gold tagged with the ...
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(1997)The survival of coesite in ultrahigh-pressure (UHP) rocks has important implications for the exhumation of subducted crustal rocks. We have conducted experiments to study the mechanism and rate of the coesite->quartz ...
Now showing items 6333-6352 of 21934