Browsing ELibrary by Author "Zachara J.M."

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ADSORPTION AND DISSOCIATION OF CO-EDTA COMPLEXES IN IRON OXIDE-CONTAINING SUBSURFACE SANDS

Zachara J.M.; Smith S.C.; Kuzel L.S. (1995)

The sorption of Co(II)EDTA2- (where EDTA is ethylenediaminetetracetic acid) was investigated on goethite and on eight sand-textured Quaternary and Pliocene fluvial sediments. Dual-label tracer techniques were used to follow ...
BIOGENIC IRON MINERALIZATION ACCOMPANYING THE DISSIMILATORY REDUCTION OF HYDROUS FERRIC OXIDE BY A GROUNDWATER BACTERIUM - SORPTION OF MN2+ ON FECO3

Fredrickson J.K.; Zachara J.M.; Kennedy D.W.; Dong H.; Onstott T.C.; Hinman N.W.; Li S.M. (1998)

Dissimilatory iron-reducing bacteria (DIRB) couple the oxidation of organic matter or H2 to the reduction of iron oxides. The factors controlling the rate and extent of these reduction reactions and the resulting solid ...
BIOTRANSFORMATION OF TWO-LINE SILICA-FERRIHYDRITE BY A DISSIMILATORY FE(III)-REDUCING BACTERIUM: FORMATION OF CARBONATE GREEN RUST IN THE PRESENCE OF PHOSPHATE

Kukkadapu R.K.; Zachara J.M.; Fredrickson J.K.; Kennedy D.W. (2004)

The reductive biotransformation of two Si-ferrihydrite coprecipitates (1 and 5 mole % Si) by Shewanella putrefaciens, strain CN32, was investigated in 1,4-piperazinediethanesulfonic acid-buffered media (pH ∼7) with lactate ...
CHROMIUM SPECIATION AND MOBILITY IN A HIGH LEVEL NUCLEAR WASTE VADOSE ZONE PLUME

Zachara J.M.; Ainsworth C.C.; McKinley J.P.; Qafoku O.; Smith S.C.; Szecsody J.E.; Brown Jr.G.E.; Catalano J.G.; Warner J.A.; Traina S.J. (2004)

Radioactive core samples containing elevated concentrations of Cr from a high level nuclear waste plume in the Hanford vadose zone were studied to asses the future mobility of Cr. Cr(VI) is an important subsurface contaminant ...
ENZYMOLOGY OF ELECTRON TRANSPORT: ENERGY GENERATION WITH GEOCHEMICAL CONSEQUENCES

DiChristina T.J.; Fredrickson J.K.; Zachara J.M. (2005)

Dissimilatory metal-reducing bacteria (DMRB) are important components of the microbial community residing in redox-stratified freshwater and marine environments. DMRB occupy a central position in the biogeochemical cycles ...
FLUORESCENCE SPECTROSCOPY OF U(VI)-SILICATES AND U(VI)-CONTAMINATED HANFORD SEDIMENT

Wang Z.; Zachara J.M.; Gassman P.L.; Liu C.; Qafoku O.; Yantasee W.; Catalano J.G. (2005)

Time-resolved U(VI) laser fluorescence spectra (TRLFS) were recorded for a series of natural uranium-silicate minerals including boltwoodite, uranophane, soddyite, kasolite, sklodowskite, cuprosklodowskite, haiweeite, and ...
INFLUENCE OF MN OXIDES ON THE REDUCTION OF URANIUM(VI) BY THE METAL-REDUCING BACTERIUM SHEWANELLA PUTREFACIENS

Fredrickson J.K.; Zachara J.M.; Kennedy D.W.; Liu C.; Duff M.C.; Hunter D.B.; Dohnalkova A. (2002)

The potential for Mn oxides to modify the biogeochemical behavior of U during reduction by the subsurface bacterium Shewanella putrefaciens strain CN32 was investigated using synthetic Mn(III/IV) oxides (pyrolusite [β-MnO2], ...
MINERAL TRANSFORMATIONS ASSOCIATED WITH THE MICROBIAL REDUCTION OF MAGNETITE

Dong H.; Fredrickson J.K.; Kennedy D.W.; Zachara J.M.; Kukkadapu R.K.; Onstott T.C. (2000)

Although dissimilatory iron reducing bacteria (DIRB) are capable of reducing a number of metals in oxides and soluble forms, the factors controlling the rate/extent of magnetite reduction and the nature of the mineral ...
NONLOCAL BACTERIAL ELECTRON TRANSFER TO HEMATITE SURFACES

Rosso K.M.; Zachara J.M.; Fredrickson J.K.; Gorby Y.A.; Smith S.C. (2003)

Mechanisms by which dissimilatory iron-reducing bacteria utilize iron and manganese oxide minerals as terminal electron acceptors for respiration are poorly understood. In the absence of exogenous electron shuttle compounds, ...
OXIDATION AND ADSORPTION OF CO(II) EDTA2- COMPLEXES IN SUBSURFACE MATERIALS WITH IRON AND MANGANESE OXIDE GRAIN COATINGS

Zachara J.M.; Gassman P.L.; Smith S.C.; Taylor D. (1995)

Batch interaction experiments were performed under aerobic conditions to characterize the adsorption behavior and valence speciation of CoEDTA complexes (equimolar at 10-5 mol/L) in a series of Pliocene subsurface sediments ...
REDUCTION OF TCO4- BY SEDIMENT-ASSOCIATED BIOGENIC FE(II)

Fredrickson J.K.; Zachara J.M.; Kennedy D.W.; Kukkadapu R.K.; McKinley J.P.; Heald S.M.; Liu C.; Plymale A.E. (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 ...
REDUCTION OF U(VI) IN GOETHITE (α-FEOOH) SUSPENSIONS BY A DISSIMILATORY METAL-REDUCING BACTERIUM

Fredrickson J.K.; Zachara J.M.; Kennedy D.W.; Duff M.C.; Gorby Y.A.; Li S.M.W.; Krupka K.M. (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 ...
SOLUBILIZATION OF FE(III) OXIDE-BOUND TRACE METALS BY A DISSIMILATORY FE(III) REDUCING BACTERIUM

Zachara J.M.; Fredrickson J.K.; Smith S.C.; Gassman P.L. (2001)

Trace metals associate with Fe(III) oxides as adsorbed or coprecipitated species, and consequently, the biogeochemical cycles of iron and the trace metals are closely linked. This communication investigated the solubilization ...
SURFACE-CHARGE PROPERTIES AND UO2+2 ADSORPTION OF A SUBSURFACE SMECTITE

Turner G.D.; Zachara J.M.; McKinley J.P.; Smith S.C. (1996)

Surface charge and UO22+ adsorption were measured on a clay-sized, subsurface mineral isolate whose mineralogy was dominated by a ferrogenous beidellite. Experiments were performed in batch at 25°C with N2(g) atmosphere ...

Browsing ELibrary by Author "Zachara J.M."

Browsing ELibrary by Author "Zachara J.M."

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