Scott C. Brooks

Oak Ridge National Laboratory

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David B. Watson

Oak Ridge National Laboratory

Philip M. Jardine

Woods Hole Oceanographic Institution

Kenneth Kemner

Argonne National Laboratory

Baohua Gu

Oak Ridge National Laboratory

Tonia L. Mehlhorn

Oak Ridge National Laboratory

Tim Scheibe

Pacific Northwest National Laboratory

Mark J. Peterson

Oak Ridge National Laboratory

Craig C. Brandt

Oak Ridge National Laboratory

Kenneth A. Lowe

Oak Ridge National Laboratory

Scott Fendorf

Stanford University

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Oak Ridge National Laboratory

203

Pacific Northwest National Laboratory

Lawrence Berkeley National Laboratory

University of Tennessee at Knoxville

Stanford University

University of California, Berkeley

Argonne National Laboratory

Battelle

Georgia Institute of Technology

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Bioelectric potentials in Nitella

PROTOPLASMA (1928)

Scott C. Brooks Samuel Gelfan

Nitella

10.1007/bf01604591

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Citations (13)

A Spreadsheet Program for Two‐Well Tracer Test Data Analysis

Ground Water (2011)

Guoping Tang David B. Watson Jack Parker Scott C. Brooks

Two‐well tracer tests are often conducted to investigate subsurface solute transport in the field. Analyzing breakthrough curves in extraction and monitoring wells using numerical methods is nontrivial due to highly nonuniform flow conditions. We extended approximate analytical solutions for the advection‐dispersion equation for an injection‐extraction well doublet in a homogeneous confined aquifer under steady‐state flow conditions for equal injection and extraction rates with no transverse dispersion and negligible ambient flow, and implemented the solutions in Microsoft Excel using Visual Basic for Application (VBA). Functions were implemented to calculate concentrations in extraction and monitoring wells at any location due to a step or pulse injection. Type curves for a step injection were compared with those calculated by numerically integrating the solution for a pulse injection. The results from the two approaches are similar when the dispersivity is small. As the dispersivity increases, the latter was found to be more accurate but requires more computing time. The code was verified by comparing the results with published‐type curves and applied to analyze data from the literature. The method can be used as a first approximation for two‐well tracer test design and data analysis, and to check accuracy of numerical solutions. The code and example files are publicly available.

TRACER

10.1111/j.1745-6584.2011.00841.x

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Citations (2)

Thallium Poisoning and Soil Fertility

Science (1932)

Scott C. Brooks

Thallium

10.1126/science.75.1934.105-b

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Citations (1)

Auto-Inhibition of Oxide Mineral Reductive Capacity Toward Co(II)EDTA

ACS symposium series (1999)

Scott Fendorf Phillip M. Jardine D. Taylor Scott C. Brooks Elizabeth A. Rochette

Subsurface migration of 60Co has been attributed to organic chelating agents and oxidation of Co(II)EDTA2- to Co(III)EDTA- by mineral surfaces. Although the oxidized product (Co(III)EDTA-) has been detected in solution, a reduced species has not been measured. As a result, fate and transport mechanisms involving 60Co remain ill-defined. Accordingly, the objective of this research was to determine redox changes in the solid-phase oxidants, β-MnO2 and Fe(OH)3·nH2O, during reaction with Co(II)EDTA2-. Time-resolved changes in the surface composition of β-MnO2 was accomplished in hydrodynamic systems using XANES spectroscopy. The transport of Co(II)EDTA2- through packed beds of β -MnO2 resulted in a decrease in structural Mn(IV) and an increase in Mn(III) as a Mn2O3-like phase. As the quantity of Mn2O3 increased, the production of Co(III)EDTA- decreased. Thus, it appears that the surface association of Mn2O3 produced from the oxidation of Co(II)EDTA2- impedes the redox reaction. We were unable to detect surface structural alterations on Fe(OH)3·nH2O upon reacting with Co(II)EDTA2-.

XANES

10.1021/bk-1998-0715.ch018

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Citations (7)

Comparison of Fiber-Optic Distributed Temperature Sensing and Mobile High-Sensitivity Temperature Probes for Stream and Hyporheic Zone Characterization

AGU Fall Meeting Abstracts (2020)

R. A. M. Mohamed C. Gabrielli Tanzila Ahmed J. S. Selker Frank Selker

Characterization

Source

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U(VI) Bioreduction with Emulsified Vegetable Oil as the Electron Donor – Microcosm Tests and Model Development

Environmental Science & Technology (2013)

Guoping Tang Wei‐Min Wu David B. Watson Jack Parker Christopher W. Schadt

We conducted microcosm tests and biogeochemical modeling to study U(VI) reduction in contaminated sediments amended with emulsified vegetable oil (EVO). Indigenous microorganisms in the sediments degraded EVO and stimulated Fe(III), U(VI), and sulfate reduction, and methanogenesis. Acetate concentration peaked in 100–120 days in the EVO microcosms versus 10–20 days in the oleate microcosms, suggesting that triglyceride hydrolysis was a rate-limiting step in EVO degradation and subsequent reactions. Acetate persisted 50 days longer in oleate- and EVO- than in ethanol-amended microcosms, indicating that acetate-utilizing methanogenesis was slower in the oleate and EVO than ethanol microcosms. We developed a comprehensive biogeochemical model to couple EVO hydrolysis, production, and oxidation of long-chain fatty acids (LCFA), glycerol, acetate, and hydrogen, reduction of Fe(III), U(VI) and sulfate, and methanogenesis with growth and decay of multiple functional microbial groups. By estimating EVO, LCFA, and glycerol degradation rate coefficients, and introducing a 100 day lag time for acetoclastic methanogenesis for oleate and EVO microcosms, the model approximately matched observed sulfate, U(VI), and acetate concentrations. Our results confirmed that EVO could stimulate U(VI) bioreduction in sediments and the slow EVO hydrolysis and acetate-utilizing methanogens growth could contribute to longer term bioreduction than simple substrates (e.g., ethanol, acetate, etc.) in the subsurface.

Microcosm

Biogeochemical Cycle

10.1021/es304641b

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Citations (27)

The rate of penetration of rubidium into living cells of Valonia and its relation to apparent ionic radii

Journal of Cellular and Comparative Physiology (1932)

Scott C. Brooks

Rubidium

Penetration (warfare)

Ionic radius

10.1002/jcp.1030020209

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Citations (11)

The rate of penetration of dyes into Valonia, with special reference to solubility theories of permeability

Journal of Cellular and Comparative Physiology (1932)

Scott C. Brooks Matilda Moldenhauer Brooks

10.1002/jcp.1030020106

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Citations (8)

Rogers Quarry Special Studies Report 2023

Scott C. Brooks Teresa Mathews R. Trent Jett Paul G. Matson Michael Jones

Chestnut Ridge OU 4 consists of Rogers Quarry and Lower McCoy Branch (MCB). Rogers Quarry, which is also known as Old Rogers Quarry or Bethel Valley Quarry was used for quarrying from the late 1940s or early 1950s until about 1960. Since that time, the quarry has been used for disposal of coal ash and materials from Y-12 production operations, including classified materials. Disposal of coal ash ended in July 1993. An RI is being conducted at this site in response to CERCLA regulations. The overall objectives of the RI are to collect data necessary to evaluate the nature and extent of contaminants of concern, support an Ecological Risk Assessment and a Human Health Risk Assessment, support the evaluation of remedial alternatives, and ultimately develop a Record of Decision for the site. The purpose of this work plan is to outline RI activities necessary to define the nature and extent of suspected contaminants at Chestnut Ridge OU 4. Potential migration pathways also will be investigated. Data collected during the RI will be used to evaluate the risk posed to human health and the environment by OU 4.

Plucking

10.2172/2007717

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SELECTIVE ACCUMULATION OF IONS IN CAVITIES INCOMPLETELY SURROUNDED BY PROTOPLASM

Biological Bulletin (1933)

Scott C. Brooks

Protoplasm

Biological sciences

10.2307/1537500

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Citations (3)