Paul M Bradley
Introduction: Research Hydrologist/Ecologist with the South Atlantic Water Science Center focused on understanding environmental contaminant mixture exposures and real versus perceived effects to human and environmental health.
Paul is project lead, along with Kelly Smalling, of the Drinking-Water and Wastewater Infrastructure Integrated Science Team of the Ecosystems Mission, Environmental Health Program. His research focuses on human exposures to and potential effects of inorganic, organic, and microbial contaminant mixtures in drinking water at the point of use and on anthropogenic contaminant mixtures as ecosystem stressors.
Professional Experience
1988–present: Research Ecologist/Hydrologist, U.S. Geological Survey
Expertise:
• Contaminant mixtures
• Drinking water
• Water quality
• Environmental health
Education and Certifications
B.S., Applied Biology, Georgia Institute of Technology, Atlanta, Georgia
M.S., Applied Biology, Georgia Institute of Technology, Atlanta, Georgia
Ph.D., Physiological Ecology, University of South Carolina, Columbia, South Carolina
Science and Products
Microbial acetogenesis as a source of organic acids in ancient Atlantic Coastal Plain sediments
Effects of carbon and nitrate on denitrification in bottom sediments of an effluent-dominated river
Assessment of intrinsic bioremediation of jet fuel contamination in a shallow aquifer, Beaufort, South Carolina
Rapid toluene mineralization by aquifer microorganisms at Adak, Alaska: Implications for intrinsic bioremediation in cold environments
Factors affecting microbial 2,4,6-trinitrotoluene mineralization in contaminated soil
Microbial transformation of nitroaromatics in surface soils and aquifer materials
Effect of atrazine on potential denitrification in aquifer sediments
Arsenate inhibition of denitrification in nitrate contaminated sediments
Influence of Pb on microbial activity in Pb-contaminated soils
Does lead affect microbial metabolism in aquifer sediments under different terminal electron accepting conditions?
Influence of environmental factors on denitrification in sediment contaminated with JP-4 jet fuel
Carbon limitation of denitrification rates in an anaerobic groundwater system
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Microbial acetogenesis as a source of organic acids in ancient Atlantic Coastal Plain sediments
Field and laboratory evidence shows that deeply buried (90–888 m) fine-grained sediments of the Atlantic Coastal Plain contain viable acetogenic microorganisms, and that these microorganisms actively produce organic acids. Concentrations of formate, acetate, and propionate in pore waters extracted from fine-grained sediments ranged from 50 μM to 5 mM and were much higher than in adjacent pore wateAuthorsF. H. Chapelle, P. M. BradleyEffects of carbon and nitrate on denitrification in bottom sediments of an effluent-dominated river
Nitrogen and carbon limitation of denitrification in the bed sediments of an effluent-dominated stream were investigated by quantifying the effects of nitrate and glucose additions on the rate of sediment N2O production. Bed sediment samples were collected from a 30-km stretch of the South Platte River where up to 95% of the base flow discharge consists of effluent from a water treatment plant inAuthorsP. M. Bradley, P. B. McMahon, F. H. ChapelleAssessment of intrinsic bioremediation of jet fuel contamination in a shallow aquifer, Beaufort, South Carolina
Field and laboratory studies show that microorganisms indigenous to the ground-water system underlying Tank Farm C, Marine Corps Air Station Beaufort, S.C., degrade petroleum hydrocarbons under aerobic and anaerobic conditions. Under aerobic conditions, sediments from the shallow aquifer underlying the site mineralized radiolabeled (14C) toluene to 14CO2 with first-order rate constants of about -AuthorsFrank Chapelle, J. E. Landmeyer, P. M. BradleyRapid toluene mineralization by aquifer microorganisms at Adak, Alaska: Implications for intrinsic bioremediation in cold environments
No abstract available.AuthorsP. M. Bradley, F. H. ChapelleFactors affecting microbial 2,4,6-trinitrotoluene mineralization in contaminated soil
No abstract available.AuthorsP. M. Bradley, F. H. ChapelleMicrobial transformation of nitroaromatics in surface soils and aquifer materials
Microorganisms indigenous to surface soils and aquifer materials collected at a munitions-contaminated site transformed 2,4,6-trinitrotoluene (TNT), 2,4-dinitrotoluene (2,4-DNT), and 2,6-dinitrotoluene (2,6-DNT) to amino-nitro intermediates within 20 to 70 days. Carbon mineralization studies with both unlabeled (TNT, 2,4-DNT, and 2,6-DNT) and radiolabeled ([14C]TNT) substrates indicated that a sigAuthorsP. M. Bradley, F. H. Chapelle, J. E. Landmeyer, J.G. SchumacherEffect of atrazine on potential denitrification in aquifer sediments
Agriculturaf use of fertilizers and herbicides has often resulted in nitrate and atrazine contamination of the shallow aquifers that underlay cultivated fields. In several cases, the concentrations of atrazine and nitrate dissolved in ground water are positively correlated (Spalding ef al., 1979; Chen and Druliner, 1987; Spalding et al., 1989). Because simultaneous application of nitrate fertilizeAuthorsP. M. Bradley, F. H. Chapelle, M.L. Jagucki, P. B. McMahonArsenate inhibition of denitrification in nitrate contaminated sediments
Short-term and chronic exposure effects of arsenic on sediment denitrification were evaluated. N2O production rates were determined for As-contaminated (chronic treatment) and uncontaminated (short-term treatment) sediments exposed to a range of As concentrations. The As-containing sediments, collected from an herbicide-contaminated shallow aquifer, exhibited significantly lower rates of denitrifiAuthorsP. M. Bradley, F. H. ChapelleInfluence of Pb on microbial activity in Pb-contaminated soils
Investigations of the influence of Pb on soil microbial communities have focused on Pb concentrations of 1 g kg-’ or less (Barkay et al., 1985; Capone et al., 1983; Chang and Broadbent, 1981; Doelman and Haanstra, 1979; Trevors et al., 1985). However, a number of environments exist in which Pb concentrations exceed 1 g kg-’ dry soil (Davenport and Peryea, 1991; Davis et al., 1992; Bisessar, 1982).AuthorsJ. E. Landmeyer, P. M. Bradley, F. H. ChapelleDoes lead affect microbial metabolism in aquifer sediments under different terminal electron accepting conditions?
High concentrations of aliphatic organic acids (∼1 mM acetate) in groundwater from a petroleum hydrocarbon‐contaminated aquifer are associated with elevated concentrations (∼30 μg/L) of lead. This pattern suggests that toxic effects of lead have contributed to the observed accumulation of organic acids. This hypothesis was tested by examining the effects of lead on carbon mineralization and organiAuthorsP. M. Bradley, F. H. Chapelle, D. A. VrobleskyInfluence of environmental factors on denitrification in sediment contaminated with JP-4 jet fuel
In 1975, the loss of approximately 83,000 gallons of JP-4 grade jet fuel resulted in contamination of the shallow aquifer near North Charleston, South Carolina. To identify those factors likely to influence microbial activity under denitrifying conditions, we examined the fate of amended NO3, the effect of pH, NO3, and PO4 on denitrification, and the variability of denitrification in sediments colAuthorsPaul M. Bradley, C. Marjorie Aelion, Don A. VrobleskyCarbon limitation of denitrification rates in an anaerobic groundwater system
No abstract available.AuthorsP. M. Bradley, M. Fernandez, F. H. Chapelle - Web Tools
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