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Browsing ELibrary by Title
Now showing items 4291-4310 of 22924
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(1998)Dissociation constants of sodium acetate ion pair (NaCH3COO0) were determined at the liquid–vapor saturation pressure by Raman spectroscopy at temperatures from 20 to 240°C and by potentiometry at temperatures from 25 to ...
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(2005)The argon solubility of 38 liquids in the system Na2O-CaO-MgO-Al2O3-SiO2 (NCMAS) has been determined at 1873 K and 1 bar, the argon concentration of presaturated glasses being measured using a static mass spectrometer. For ...
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(1997)Laboratory culturing is a direct means of determining Cd uptake in shells of planktonic foraminifera. We employed a new stable isotope technique using both 110Cd and 111Cd to assess uptake in the symbiont bearing species, ...
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(2002)The solubility of calcite in NaCl-H2O solutions was measured at 600-900 °C, 10 kbar, at NaCl concentrations ranging from dilute to near halite saturation, and at 6-14 kbar, 700 °C, in 30 mol% NaCl solutions. Solubility was ...
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(1997)By mixing aliquots of pure Na2CO3 and CO2, solutions with precisely known molal fractions of CO=3, HCO-3, and dissolved CO2 were prepared. The apparent fractionation factor between gaseous CO2 and total carbon in the ...
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(1999)Activity-composition relations in CO 2 -H 2 O solutions were determined at 6, 10, and 14 kbar over broad temperature-fluid composition ranges from 70 reversed determinations of three simple-system decarbonation and dehydration ...
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(2001)The velocity of the compressional wave (VP) was measured for olivine aggregate at temperatures up to 1000°C at 1GPa using a piston-cylinder high-pressure apparatus. The samples used in the present study were hot-pressed ...
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(2000)We have measured compressional wave velocity (VP) in talc as a function of temperature at 0.5 GPa. VP falls from 5.27+/-0.23 km s-1 at 25°C to 4.35+/-0.15 km s-1 at 800°C. Combining these results with a previously published ...
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(1995)A hydrothermal-analytical procedure has been developed that allows for the quantitative study of anion exchange rates in hydrous silicates. This new procedure has provided the first opportunity to quantitatively investigate ...
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(2004)Iron isotope fractionation between aqueous iron and siderite has been measured using abiotic synthesis experiments at ∼20 °C. Applying a Rayleigh distillation model to three experiments in which siderite (FeCO3) was ...
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(1989)Metal/silicate partition coefficients were determined at 1600°C for P, Ga, Ge and W and at 1300°C for P, Fe, Co, Ni, Cu, Ga, Ge, Mo and W. Experiments span a range of two orders-of-magnitude in oxygen fugacity. Good ...
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(2004)Diffusion couple experiments were carried out with San Carlos olivine (Fo90) and NiFe alloys (Ni100, Ni97Fe3, Ni90Fe10) or other olivine compositions (Fo100, Fo25) in order to determine the dependence on temperature, oxygen ...
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EXPERIMENTAL DETERMINATION OF OXYGEN ISOTOPE FRACTIONATIONS BETWEEN CO2 VAPOR AND SODA-MELILITE MELT (2003)We report results of experiments constraining oxygen isotope fractionations between CO2 vapor and Na-rich melilitic melt at 1 bar and 1250 and 1400°C. The fractionation factor constrained by bracketed experiments, ...
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(2001)In this study, densities of gallium and germanium bearing silicate liquids were determined using the double bob Archimedian method. The silicate base components of the liquids were sodium disilicate (NS2) and anorthite-diopside ...
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(1998)Solid solutions of the REE+Y orthophosphates monazite and xenotime were synthesized hydrothermally between 300°C and 800°C at 2 and 5 kbar using REE+Y-oxides and H3PO4 as starting materials. The REE bulk composition was ...
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(2002)Fractionation of selected REE between brine and vapour was experimentally determined using a large-volume rocking Ti-autoclave that allowed quasi-isobaric sampling of liquid-vapour pairs. Samples were extracted along the ...
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(1998)Based on the use of thermodynamic data, chemical modelling offers a unique technique to predict and understand the chemistry of metal ions in aquatic systems. This paper discusses the necessary precautions that must be ...
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(2004)The solubility of synthetic NdPO4 monazite end-member has been determined experimentally from 21 to 300°C in aqueous solutions at pH = 2, and at 21°C and pH = 2 for GdPO4. Measurements were performed in batch reactors, ...
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(2003)We determined activity-composition relationships in Pt-Cr and Pt-Fe-Cr alloys at 1300°C experimentally and used the results to constrain the thermodynamic properties of chromite-picrochromite spinels. The Pt-Cr binary is ...
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(2004)An understanding of the activity-composition (a-X) relations and phase equilibria of halite-bearing, mixed-species supercritical fluids is critically important in many geological and industrial applications. We have performed ...
Now showing items 4291-4310 of 22924