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Now showing items 12277-12296 of 39126
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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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(2006)A <2.0-mm fraction of a mineralogically complex subsurface sediment containing goethite and Fe(II)/Fe(III) phyllosilicates was incubated with Shewanella putrefaciens (strain CN32) and lactate at circumneutral pH under ...
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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 ...
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(2002)The REE distribution in fluorites as an indicator of geologic-genetic features of ore deposits related to various magmatic associations was discussed. It was found that with an increase in the distance between the ...
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(2001)The unique Li-bearing metasomatic deposit formed in the outer contact of the Etyka Ta-bearing amazonite granite massif was studied. The metasomatites were formed in the pregranite and syngrahite stages. The pregranite stage ...
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(2001)Very few studies deal with REE (rare earth element) mobility within the system soil-soil solution-streamwater. In this article, we try to characterize the fractionation and the migration of the REE in a granite-derived ...
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(2003)The study of the geochemistry of rare-earth and trace elements in calcic amphibole from the Nyurundukan mafic complex, northwestern Baikal region, showed that their abundance and distribution depend on the grade of ...
Now showing items 12277-12296 of 39126