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Browsing ELibrary by Title
Now showing items 6300-6319 of 21821
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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 ...
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KINETICS OF THE COESITE-QUARTZ TRANSITION: APPLICATION TO THE EXHUMATION OF ULTRAHIGH-PRESSURE ROCKS (2003)The kinetics of the quartz–coesite phase transition has been studied in situ by X-ray diffraction in the 2·1–3·2 GPa, 500–1010°C pressure–temperature range. Analysis of the data within Cahn's model of nucleation and growth ...
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(1996)The kinetics of the formation and the dissolution of Ni surface precipitates on pyrophyllite was studied in order to gain an understanding of the dynamics of heavy metal ion reactions in soils. Ni sorption at pH = 7.5 was ...
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(2004)The graphite-diamond transformation was investigated by in situ time-resolved X-ray diffraction experiments using aqueous fluid containing dissolved MgO as the diamond-forming catalyst under conditions of 6.6–8.9 GPa and ...
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(1988)
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(1997)Controlled cooling rate experiments of hydrous rhyolitic glasses have been carried out to examine the relation between the apparent equilibrium temperature of the quenched glass (or the final quenched speciation of molecular ...
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(2002)The rate of spinel (MgAl2O4) growth at the interface between MgO and Al2O3 was investigated systematically at temperatures of 1200° to ∼2000°C and pressures between 1.0 and 4.0 GPa with a solid-media, piston-cylinder ...
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(1990)We measured the kinetics of the transformation of kyanite to andalusite and sillimanite and of andalusite to sillimanite in order to determine the activation energies of the transformations and to estimate the absolute ...
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(2005)Little or no information is available in the literature about reaction processes of co-sorbing metals and arsenate [As(V)] on variable-charged surfaces or factors influencing these reactions. Arsenic and metal contamination ...
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(2001)The effects of different microbial populations on the oxidative dissolution of sulfide minerals at 37°C and pH 1.5 were examined over a period of 22 days. Samples of pyrite, marcasite, and arsenopyrite were exposed to a ...
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(2002)We derive Kirchhoff-approximate inversion formulae for elastic wavefields that recover the location of discontinuity surfaces and associated material property contrasts in laterally varying, stratified media. The derivation ...
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(2004)Kokchetavite, a new polymorph of K-feldspar (KAlSi3O8), has been identified as micrometer-size inclusions in clinopyroxene and garnet in a garnet-pyroxene rock from the Kokchetav ultrahigh-pressure terrane, Kazakhstan. ...
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(2001)Сделана попытка количественно оценить химический состав и объемы мантии, активизация которой привела к формированию в палеозое в северо-восточной части Балтийского щита Кольской щелочной провинции. В отличие от известных ...
Now showing items 6300-6319 of 21821