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Browsing ELibrary by Title
Now showing items 9902-9921 of 21768
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(1993)The oxidation state of lithospheric upper mantle is heterogeneous on a scale of at least four log units. Oxygen fugacities ( fO2 f_{O_2 } ) relative to the FMQ buffer using the olivine-orthopyroxene-spinel equilibrium range ...
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(1998)Mangrove forest sediments can provide a sink for trace metals because the mangroves create a baffle that promotes the accumulation of fine-grained organic matter-rich sediment, which is usually sulphidic due to the presence ...
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(1996)The concept of redox zonation during degradation of organic matter, which is usually explained by the overall energy yield of different reactions, has been reevaluated. At least for reduction of Mn(IV), Fe(III), sulfate, ...
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(1988)Judging by petrographic and f-radiographic data, a feature specific to such fluid is the presence in it of uranium. That explains why different categories of carbon compounds, generated as a result of its breakdown, also ...
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(2003)Mining applications commonly faces surprising high values designated as outliers. These values impact dramatically statistical analysis and interpretation. A comprehensive analysis on the causes for the presence of unexpected ...
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(2001)It is demonstrated that stresses generated by a crack pressurised from inside in half-space can be calculated with a single regular integral formula.
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(1996)Experimental studies demonstrate that structural Fe(II) in magnetite and ilmenite heterogeneously reduce aqueous ferric, cupric, vanadate, and chromate ions at the oxide surfaces over a pH range of 1-7 at 25°C. For an ...
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(2006)A kinetic model for the microbial reduction of Fe(III) oxyhydroxide colloids in the presence of excess electron donor is presented. The model assumes a two-step mechanism: (1) attachment of Fe(III) colloids to the cell ...
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(1997)To better understand the geochemical processes that result in the reduction of hexavalent chromium [Cr(VI)] in natural waters, the reaction of Cr(VI) with Fe(II) has been studied as a function of pH and temperature. Over ...
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(2000)The reduction of Mn-oxide by Fe2+ was studied in column experiments, using a column filled with natural Mn-oxide coated sand. Analysis of the Mn-oxide indicated the presence of both Mn(III) and Mn(IV) in the Mn-oxide. The ...
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(1998)The reduction of sulfate ion by oil was studied experimentally within a temperature range of 250-380°C in neutral and acid environments. It was shown that this reaction passes through various intermediate compounds depending ...
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(2002)Besides solid Earth and ocean tides, atmospheric pressure variations are one of the major sources of surface gravity perturbations. As shown by previous studies (Merriam 1992; Mukai et al. 1995; Boy et al. 1998), the usual ...
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(2004)The potential for reduction of 99TcO4−(aq) to poorly soluble 99TcO2 · nH2O(s) by biogenic sediment-associated Fe(II) was investigated with three Fe(III)-oxide containing subsurface materials and the dissimilatory metal-reducing ...
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(2000)Dissimilatory metal-reducing bacteria (DMRB) can utilize Fe(III) associated with aqueous complexes or solid phases, such as oxide and oxyhydroxide minerals, as a terminal electron acceptor coupled to the oxidation of H2 ...
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(2005)To increase the understanding of uranium transport in the environment and in the presence of steel corrosion products, the interaction of U(VI) with natural magnetite has been studied. Sorption studies have been carried ...
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REDUCTION OF URANIUM(VI) UNDER SULFATE-REDUCING CONDITIONS IN THE PRESENCE OF FE(III)-(HYDR)OXIDES (2004)Hexavalent uranium [U(VI)] dissolved in a modified lactate-C medium was treated under anoxic conditions with a mixture of an Fe(III)-(hydr)oxide mineral (hematite, goethite, or ferrihydrite) and quartz. The mass of ...
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(2004)Deep-seated xenoliths in kimberlites are traditionally subdivided into granular low-temperature and deformed high-temperature groups. Recently, the rare element geochemistry of rocks and minerals has been invoked more often ...
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(2004)On the base of study on the REE geochemistry of ore minerals and host rocks of typical deposits from Huangshan Cu-Ni metallogenic belt, Xinjiang, it was discovered that the host mafic-ultramafic rocks of the Cu-Ni sulfide ...
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(1998)Chemical diffusion of four rare-earth elements (La, Nd, Dy and Yb) has been measured in natural calcite under anhydrous conditions, using rare-earth carbonate powders as the source of diffusants. Experiments were run in ...
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(2002)Diffusion of several rare-earth elements has been characterized in natural plagioclase under dry, 1-atm conditions. Polished or cleaved sections of feldspar were surrounded by source powders in Pt capsules and annealed in ...
Now showing items 9902-9921 of 21768