A5037864366- Radioactive element chemistry and processing
- Groundwater flow and contamination studies
- Radioactive contamination and transfer
- Microbial Community Ecology and Physiology
- Atmospheric and Environmental Gas Dynamics
- Methane Hydrates and Related Phenomena
- Groundwater and Isotope Geochemistry
- Radioactivity and Radon Measurements
- Hydrocarbon exploration and reservoir analysis
- Geochemistry and Geologic Mapping
- Geochemistry and Elemental Analysis
- Mine drainage and remediation techniques
- CO2 Sequestration and Geologic Interactions
- Chemical Synthesis and Characterization
- Chromium effects and bioremediation
- Clay minerals and soil interactions
- Microbial Fuel Cells and Bioremediation
- Metal Extraction and Bioleaching
- Iron oxide chemistry and applications
- Environmental remediation with nanomaterials
- Nuclear materials and radiation effects
- Hydraulic Fracturing and Reservoir Analysis
- Wastewater Treatment and Nitrogen Removal
- Nuclear and radioactivity studies
- Heavy metals in environment
Pacific Northwest National Laboratory
2009-2019
Battelle
1993-2016
United States Department of Commerce
2005-2010
Office of Scientific and Technical Information
2005-2010
National Technical Information Service
2005-2010
George Washington University
2010
University of Tennessee at Knoxville
2003-2009
Argonne National Laboratory
2004-2009
United States Army Corps of Engineers
2009
Oregon State University
2005-2006
Bacterial communities were detected in deep crystalline rock aquifers within the Columbia River Basalt Group (CRB). CRB ground waters contained up to 60 μM dissolved H 2 and autotrophic microorganisms outnumbered heterotrophs. Stable carbon isotope measurements implied that methanogenesis dominated this ecosystem was coupled depletion of inorganic carbon. In laboratory experiments, , a potential energy source for bacteria, produced by reactions between crushed basalt anaerobic water....
To investigate the distribution of microbial biomass and activities to gain insights into physical controls on activity potential long‐term survival in subsurface, 24 shale sandstone cores were collected from a site northwestern New Mexico. Bacterial core samples ranged below detection 31.9 pmol total phospholipid fatty acid (PLFA) g‐1 rock with no apparent relationship between lithology PLFA abundance. No metabolic activities, as determined by anaerobic mineralization [14C]acetate...
ABSTRACT Microbially mediated reduction and immobilization of U(VI) to U(IV) plays a role in both natural attenuation accelerated bioremediation uranium-contaminated sites. To realize potential accurately predict attenuation, it is important first understand the microbial diversity such In this paper, distribution sulfate-reducing bacteria (SRB) contaminated groundwater associated with uranium mill tailings disposal site at Shiprock, N.Mex., was investigated. Two culture-independent analyses...
ABSTRACT To help provide a fundamental basis for use of microbial dissimilatory reduction processes in separating or immobilizing 99 Tc waste groundwaters, the effects electron donor and presence bicarbonate ion on rate extent pertechnetate [Tc(VII)O 4 − ] enzymatic by subsurface metal-reducing bacterium Shewanella putrefaciens CN32 were determined, forms aqueous solid-phase products evaluated through combination high-resolution transmission microscopy, X-ray absorption spectroscopy,...
The disposal of basic sodium aluminate and acidic U(VI)−Cu(II) wastes in the now-dry North South 300 A Process Ponds at Hanford site resulted a groundwater plume U(VI). To gain insight into geochemical processes that occurred during waste those affecting current future fate transport this uranium plume, solid-phase speciation depth sequence sediments from base Pond through vadose zone to was investigated using standard chemical mineralogical analyses, electron X-ray microprobe measurements,...
Individual 1−3 mm biotite and muscovite clasts from Hanford sediment were contacted with 0.08 M CsNO3. They examined using electron or X-ray microprobe methods, as intact specimens sectioned perpendicular to their basal planes. Cs+ was observed preferentially sorb mica edges, steps on surfaces, fractured regions. The localization of Cs conformed hypothesized strong binding frayed edge sites in preference In section, found penetrate the interior, forming discrete zones concentration,...
Abiotic production of H2 from basalt reactions in aqueous solutions is hypothesized to support microbial ecosystems deep subsurface aquifers, such as those found the Columbia River Basalt group (CRB). We investigated factors controlling this phenomenon, including rock composition, pH, temperature, sterilization method, reducing agents, and product removal. Ferrous silicate minerals were be components responsible for anaerobic water−rock interactions. evolution was faster at pH < 7 but...
To understand the conditions under which microorganisms exist in deep hydrocarbon reservoirs, sidewall cores were collected from a natural gas‐bearing formation, 2800 m below surface Taylorsville Basin, Virginia. Data chemical and microbial tracers controls indicate that interiors of some contained indigenous to rock formation. The cultured composed primarily saline‐tolerant, thermophilic fermenting, Fe(III)‐reducing, sulfate‐reducing bacteria (1 104 cells/g). physiological capabilities are...
137Cesium and other contaminants have leaked from single-shell storage tanks (SSTs) into coarse-textured, relatively unweathered unconsolidated sediments. Contaminated sediments were retrieved beneath a leaky SST to investigate the distribution of adsorbed 137Cs+ across different sediment size fractions. All fractions contained mica (biotite, muscovite, vermiculatized biotite), quartz, plagioclase along with smectite kaolinite in clay-size fraction. A phosphor-plate autoradiograph method was...
Cores were collected from Late Cretaceous and Early Tertiary rocks in the Piceance Basin of western Colorado, USA, to investigate origins subsurface microorganisms under geological conditions likely constrain microbial transport survival. The sampled strata 856–862, 1996–1997 2091–2096 m recorded peak paleotemperatures 120–145°C 40–5 million years ago, while present temperatures range 43 85°C. analyzed for culturable anaerobic bacteria (Fe(III)- Mn(IV)-reducing bacteria, fermenters, sulfate...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTExperimental investigation and review of the "solids concentration" effect in adsorption studiesJames P. McKinley Everett A. JenneCite this: Environ. Sci. Technol. 1991, 25, 12, 2082–2087Publication Date (Print):December 1, 1991Publication History Published online1 May 2002Published inissue 1 December 1991https://doi.org/10.1021/es00024a015RIGHTS & PERMISSIONSArticle Views262Altmetric-Citations76LEARN ABOUT THESE METRICSArticle Views are...