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Browsing Геология России by Title
Now showing items 7800-7819 of 39124
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(1997)Steady-state dissolution rates of a synthetic basaltic glass were measured in an open-system mixed flow reactor as a function of solution composition at a temperature of 90°C and over the pH range 7.8 to 8.3. The dissolution ...
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(2004)Dissolved oxygen (DO) and organic carbon (Corg) are among the highest- and lowest-potential reactants, respectively, of redox couples in natural waters. When DO and Corg are present in subsurface settings, other couples ...
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(2002)Mass transfer between sulfide and silicate liquids is often discussed by reference to a mass ratio between hypothetical liquid reservoirs at equilibrium, defined as R. In an open system not at equilibrium the mass of ...
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(2002)The specific heat of natural and deuterated lawsonite, CaAl2Si2O7(OH)(2)(H2O)-H-., has been measured in the temperature ranges 77 K-310 K, using ac calorimetry, and 230 K-320 K, using differential scanning calorimetry. ...
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(2002)The rain kinetic energy (KE) is a widely used indicator of the potential ability of rain to detach soil. However, rain kinetic energy is not a commonly measured meteorological parameter. Therefore, empirical laws linking ...
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(2006)Iron isotopic compositions measured in chondrules from various chondrites vary between ?57Fe/54Fe = +0.9? and -2.0?, a larger range than for igneous rocks. Whether these compositions were inherited from chondrule precursors, ...
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(2004)Laboratory experiments on reagent-grade calcium carbonate and carbonate rich glacial sediments demonstrate previously unreported kinetic fractionation of carbon isotopes during the initial hydrolysis and early stages of ...
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(2006)Experiments specifically designed to measure the ratio of the diffusivities of ions dissolved in water were used to determine DLi/DK, D7Li/D6Li, D25Mg/D24Mg, D26Mg/D25Mg, and D37Cl/D35Cl. The measured ratio of the diffusion ...
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(2002)To study what dictates oxygen isotope equilibrium fractionation between inorganic carbonate and water during carbonate precipitation from aqueous solutions, a direct precipitation approach was used to synthesize witherite, ...
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(2004)The following kinetic model was proposed for K-Na feldspar under dry conditions: Ci = C0exp[(K0RT 02)/(Qg)]exp[-Q/RT0] where C i is the aluminum content in the 2t1 position after completion of the ordering process, which ...
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(2001)The experimental studies of As2S3 (am) oxidative dissolution were investigated by use of particle sizes of 8 to 44 μm in a mixed flow reactor at 25 to 40°C and initial pH 7.3 to 9.4 to determine the effect of dissolved ...
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(2003)The kinetics of the dehydroxylation of chrysotile was followed in situ at high temperature using real-time conventional and synchrotron powder diffraction (XRPD). This is the first time kinetics parameters have been ...
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(1995)ZrO2 oxygen sensors, gas mixtures, and conventional solid buffers have been used for decades to either control or measure oxygen fugacity (fO2) at high temperatures. In dry systems below ca. 700°C these techniques were ...
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(2000)The forward dissolution rate of San Carlos forsterite Fo91 was measured at 25°C in a mixed-flow reactor as a function of pH (1 to 12), ionic strength (0.001 to 0.1 M), ΣCO2 (0 to 0.05 M), aqueous magnesium (10-6 to 0.05 ...
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(2000)The effect of five low molecular weight organic acids (oxalate, malonate, salicylate, phthalate and benzoate) on the decomposition kinetics of the Al13 polymer was studied in acidic aqueous solutions using a flow-through ...
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(2000)The purpose of this study is to delineate the mechanism of isotopic exchange between zeolites and fluid. Two size fractions of analcime were exchanged with water vapor at 400°C and the isotopic change of framework oxygen ...
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(2003)Polythionates (SxO62-) are important in redox transformations involving many sulfur compounds. Here we investigate the oxidation kinetics and mechanisms of trithionate and tetrathionate oxidation between pH 0.4 and pH 2 ...
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KINETICS AND MECHANISM OF SURFACE REACTION OF SALICYLATE ON ALUMINA IN COLLOIDAL AQUEOUS SUSPENSION (2000)The reaction kinetics of salicylate with Al(III) in aqueous solution and at the colloidal alumina-water interface was studied by stopped-flow laser fluorescence spectroscopy. Temporal evolution of the fluorescence spectra ...
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(2003)The oxidation kinetics of trithionate (S3O 62-) and tetrathionate (S4O 62-) with hydroxyl radicals (OH*) have been investigated in systems analogous to acid mine drainage (AMD) environments. The discovery of hydroxyl radical ...
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(1995)Monitoring and restoration activities at low-level radioactive waste disposal sites have identified complicated mixtures of inorganic and organic contaminants in soil and groundwater. Metallic contaminants are generally ...
Now showing items 7800-7819 of 39124