Search Results - "O'Day, PA"

The Influence of Sulfur and Iron on Dissolved Arsenic Concentrations in the Shallow Subsurface under Changing Redox Conditions by O'Day, Peggy A., Vlassopoulos, Dimitri, Root, Robert, Rivera, Nelson, Turekian, Karl K.

“…The chemical speciation of arsenic in sediments and porewaters of aquifers is the critical factor that determines whether dissolved arsenic accumulates to…”
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Arsenic speciation in synthetic jarosite by Savage, Kaye S., Bird, Dennis K., O'Day, Peggy A.

“…Iron sulfate minerals may incorporate arsenic released from oxidizing arsenian pyrite and other sulfide minerals. For example, in the southern Mother Lode gold…”
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Arsenic speciation in pyrite and secondary weathering phases, Mother Lode Gold District, Tuolumne County, California by Savage, Kaye S, Tingle, Tracy N, O’Day, Peggy A, Waychunas, Glenn A, Bird, Dennis K

“…Arsenian pyrite, formed during Cretaceous gold mineralization, is the primary source of As along the Melones fault zone in the southern Mother Lode Gold…”
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Deposition and Fate of Arsenic in Iron- and Arsenic-Enriched Reservoir Sediments by Kneebone, P. E, O'Day, P. A, Jones, N, Hering, J. G

“…Deposition of arsenic to the sediments of Haiwee Reservoir (Olancha, CA) has dramatically increased since March 1996 as a result of an interim strategy for…”
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Colonization of nascent, deep-sea hydrothermal vents by a novel Archaeal and Nanoarchaeal assemblage by McCliment, Elizabeth A., Voglesonger, Kenneth M., O'Day, Peggy A., Dunn, Eileen E., Holloway, John R., Cary, S. Craig

“…Summary Active deep‐sea hydrothermal vents are areas of intense mixing and severe thermal and chemical gradients, fostering a biotope rich in novel…”
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X-Ray Absorption Spectroscopy of Strontium(II) Coordination: II. Sorption and Precipitation at Kaolinite, Amorphous Silica, and Goethite Surfaces by Sahai, Nita, Carroll, Susan A., Roberts, Sarah, O'Day, Peggy A.

“…Sorption of dissolved strontium on kaolinite, amorphous silica, and goethite was studied as a function of pH, aqueous strontium concentration, the presence or…”
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Processes of Nickel and Cobalt Uptake by a Manganese Oxide Forming Sediment in Pinal Creek, Globe Mining District, Arizona by Kay, John T, Conklin, Martha H, Fuller, Christopher C, O'Day, Peggy A

“…A series of column experiments was conducted using manganese oxide coated sediments collected from the hyporheic zone in Pinal Creek (AZ), a metal-contaminated…”
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Strontium Speciation during Reaction of Kaolinite with Simulated Tank-Waste Leachate:  Bulk and Microfocused EXAFS Analysis by Choi, Sunkyung, O'Day, Peggy A, Rivera, Nelson A, Mueller, Karl T, Vairavamurthy, Murthy A, Seraphin, Supapan, Chorover, Jon

“…Radioactive strontium (90Sr) is an important constituent of the complex wastes from past nuclear weapons production and has been stored in underground tanks at…”
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Molecular environmental geochemistry by O'Day, Peggy A.

“…The chemistry, mobility, and bioavailability of contaminant species in the natural environment are controlled by reactions that occur in and among solid,…”
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X-Ray Absorption Spectroscopy of Strontium(II) Coordination: I. Static and Thermal Disorder in Crystalline, Hydrated, and Precipitated Solids and in Aqueous Solution by O'Day, Peggy A., Newville, Matthew, Neuhoff, Philip S., Sahai, Nita, Carroll, Susan A.

“…Detailed analyses of crystalline, hydrated, and precipitated strontium compounds and an aqueous strontium solution by synchrotron extended X-ray absorption…”
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Rock−Water Interactions Controlling Zinc, Cadmium, and Lead Concentrations in Surface Waters and Sediments, U.S. Tri-State Mining District. 1. Molecular Identification Using X-ray Absorption Spectroscopy by O'Day, Peggy A, Carroll, Susan A, Waychunas, Glenn A

“…X-ray absorption spectroscopy (XAS) and X-ray absorption fine structure (XAFS) spectra of zinc-, cadmium-, and lead-bearing sediments from a mining-impacted…”
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Solid-State NMR Identification and Quantification of Newly Formed Aluminosilicate Phases in Weathered Kaolinite Systems by Crosson, Garry S, Choi, Sunkyung, Chorover, Jon, Amistadi, Mary Kay, O'Day, Peggy A, Mueller, Karl T

“…The weathering of a specimen kaolinite clay was studied over the course of 369 d via solid-state 29Si magic angle spinning (MAS) nuclear magnetic resonance…”
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Metal Speciation and Bioavailability in Contaminated Estuary Sediments, Alameda Naval Air Station, California by O'Day, Peggy A, Carroll, Susan A, Randall, Simon, Martinelli, Roger E, Anderson, Susan L, Jelinski, John, Knezovich, John P

“…Measurements of simultaneously extracted metals (SEM), acid volatile sulfide (AVS), and invertebrate toxicity were combined with X-ray absorption spectroscopy…”
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In Situ Spectroscopic and Solution Analyses of the Reductive Dissolution of MnO2 by Fe(II) by Villinski, John E, O'Day, Peggy A, Corley, Timothy L, Conklin, Martha H

“…The reductive dissolution of MnO2 by Fe(II) under conditions simulating acid mine drainage (pH 3, 100 mM SO4 2-) was investigated by utilizing a flow-through…”
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Rock−Water Interactions Controlling Zinc, Cadmium, and Lead Concentrations in Surface Waters and Sediments, U.S. Tri-State Mining District. 2. Geochemical Interpretation by Carroll, Susan A, O'Day, Peggy A, Piechowski, Mike

“…We have studied principle rock−water interactions that control trace metal concentrations in a complex geochemical environment containing multiple contaminants…”
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Image optimization and analysis of synchrotron X-ray computed microtomography (CμT) data by Ashbridge, Dawn A, Thorne, Michael S, Rivers, Mark L, Muccino, Julia C, O’Day, Peggy A

“…Synchrotron X-ray computed microtomography (CμT) is a non-destructive technique for imaging porous and compositionally heterogeneous samples in three…”
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Speciation and fate of trace metals in estuarine sediments under reduced and oxidized conditions, Seaplane Lagoon, Alameda Naval Air Station (USA) by Carroll, Susan, O'Day, Peggy A, Esser, Brad, Randall, Simon

“…We have identified important chemical reactions that control the fate of metal-contaminated estuarine sediments if they are left undisturbed (in situ) or if…”
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Experimental abiotic synthesis of methanol in seafloor hydrothermal systems during diking events by Voglesonger, Kenneth M, Holloway, John R, Dunn, Eileen E, Dalla-Betta, Peter J, O'Day, Peggy A

“…The abiotic synthesis of organic compounds in seafloor hydrothermal systems is one mechanism through which the subsurface environment could be supplied with…”
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Pyroclastic deposits within the East Greenland Tertiary flood basalts by Heister, L. E, O'Day, P. A, Brooks, C. K, Neuhoff, P. S, Bird, D. K

“…Stratigraphic, geochemical and mineralogical characterization of pyroclastic deposits on the Gronau West Nunatak of East Greenland indicates that both alkaline…”
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X-Ray Absorption Spectroscopy of Strontium(II) Coordination by Sahai, N, Carroll, SA, Roberts, S, O'Day, PA

“…Sorption of dissolved strontium on kaolinite, amorphous silica, and goethite was studied as a function of pH, aqueous strontium concentration, the presence or…”
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