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
Methane as a product of chloroethene biodegradation under methanogenic conditions
Aerobic mineralization of MTBE and tert-butyl alcohol by stream-bed sediment microorganisms
Fate of MTBE relative to benzene in a gasoline-contaminated aquifer (1993-98):
Anaerobic oxidation of [1,2-14C]Dichloroethene under Mn(IV)-reducing conditions
Humic acids as electron acceptors for anaerobic microbial oxidation of vinyl chloride and dichloroethene
Natural attenuation assessment of contaminated ground water at a gas-turbine manufacturing plant, Greenville, South Carolina
Anaerobic oxidation of [1,2-14C]dichloroethene under Mn(IV)-reducing conditions
Field and laboratory evidence for intrinsic biodegradation of vinyl chloride contamination in a Fe(III)-reducing aquifer
Selecting remediation goals by assessing the natural attenuation capacity of groundwater systems
Effect of contaminant concentration on aerobic microbial mineralization of DCE and VC in stream-bed sediments
Microbial mineralization of VC and DCE under different terminal electron accepting conditions
Assessment of natural attenuation of aromatic hydrocarbons in groundwater near a former manufactured-gas plant, South Carolina, USA
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Methane as a product of chloroethene biodegradation under methanogenic conditions
Radiometric detection headspace analyses of microcosms containing bed sediments from two geographically distinct sites indicated that 10-39% of the radiolabeled carbon transformed during anaerobic biodegradation of [1,2- 14C]trichloroethene (TCE) or [1,2-14C]vinyl chloride (VC) under methanogenic conditions was ultimately incorporated into 14CH4. The results demonstrate that, in addition to etheneAuthorsP. M. Bradley, F. H. ChapelleAerobic mineralization of MTBE and tert-butyl alcohol by stream-bed sediment microorganisms
Microorganisms indigenous to the stream-bed sediments at two gasoline- contaminated groundwater sites demonstrated significant mineralization of the fuel oxygenates, methyl tert-butyl ether (MTBE) and tert-butyl alcohol (TBA). Up to 73% of [U-14C]-MTBE and 84% of [U-14C]-TBA were degraded to 14CO2 under mixed aerobic/anaerobic conditions. No significant mineralization was observed under strictly aAuthorsP. M. Bradley, J. E. Landmeyer, F. H. ChapelleFate of MTBE relative to benzene in a gasoline-contaminated aquifer (1993-98):
Methyl tert-butyl ether (MTBE) and benzene have been measured since 1993 in a shallow, sandy aquifer contaminated by a mid-1980s release of gasoline containing fuel oxygenates. In wells downgradient of the release area, MTBK was detected before benzene, reflecting a chromatographic-like separation of these compounds in the direction of ground water flow. Higher concentrations of MTBE and benzene wAuthorsJames Landmeyer, Francis H. Chapelle, Paul M. Bradley, James F. Pankow, Clinton D. Church, Paul G. TratnyekAnaerobic oxidation of [1,2-14C]Dichloroethene under Mn(IV)-reducing conditions
Anaerobic oxidation of [1,2-14C]dichloroethene to14CO2 under Mn(IV)-reducing conditions was demonstrated. The results indicate that oxidative degradation of partially chlorinated solvents like dichloroethene can be significant even under anoxic conditions and demonstrate the potential importance of Mn(IV) reduction for remediation of chlorinated groundwater contaminants.AuthorsPaul M. Bradley, James Landmeyer, Richard S. DinicolaHumic acids as electron acceptors for anaerobic microbial oxidation of vinyl chloride and dichloroethene
Anaerobic oxidation of [1,2-14C]vinyl chloride and [1,2-14C]dichloroethene to 14CO2under humic acid-reducing conditions was demonstrated. The results indicate that waterborne contaminants can be oxidized by using humic acid compounds as electron acceptors and suggest that natural aquatic systems have a much larger capacity for contaminant oxidation than previously thought.AuthorsP. M. Bradley, F. H. Chapelle, D. R. LovleyNatural attenuation assessment of contaminated ground water at a gas-turbine manufacturing plant, Greenville, South Carolina
No abstract available.AuthorsD. A. Vroblesky, M.D. Petkewich, P. M. Bradley, J. F. RobertsonAnaerobic oxidation of [1,2-14C]dichloroethene under Mn(IV)-reducing conditions
Anaerobic oxidation of [1,2-14C]dichloroethene to14CO2 under Mn(IV)-reducing conditions was demonstrated. The results indicate that oxidative degradation of partially chlorinated solvents like dichloroethene can be significant even under anoxic conditions and demonstrate the potential importance of Mn(IV) reduction for remediation of chlorinated groundwater contaminants.AuthorsP. M. Bradley, J. E. Landmeyer, R.S. DinicolaField and laboratory evidence for intrinsic biodegradation of vinyl chloride contamination in a Fe(III)-reducing aquifer
Intrinsic bioremediation of chlorinated ethenes in anaerobic aquifers previously has not been considered feasible, due, in large part, to 1) the production of vinyl chloride during microbial reductive dechlorination of higher chlorinated contaminants and 2) the apparent poor biodegradability of vinyl chloride under anaerobic conditions. In this study, a combination of field geochemical analyses anAuthorsP. M. Bradley, F. H. Chapelle, J.T. WilsonSelecting remediation goals by assessing the natural attenuation capacity of groundwater systems
Remediation goals for the source areas of a chlorinated ethene‐contaminated groundwater plume were identified by assessing the natural attenuation capacity of the aquifer system. The redox chemistry of the site indicates that sulfate‐reducing (H2 ∼ 2 nanomoles [nM]) per liter conditions near the contaminant source grade to Fe(III)‐reducing conditions (H2 ∼ 0.5 nM) downgradient of the source. SulfaAuthorsFrancis H. Chapelle, Paul M. BradleyEffect of contaminant concentration on aerobic microbial mineralization of DCE and VC in stream-bed sediments
Discharge of DCE and VC to an aerobic surface water system simultaneously represents a significant environmental concern and, potentially, a non-engineered opportunity for efficient contaminant bioremediation. The potential for bioremediation, however, depends on the ability of the stream-bed microbial community to efficiently and completely degrade DCE and VC over a range of contaminant concentraAuthorsP. M. Bradley, F. H. ChapelleMicrobial mineralization of VC and DCE under different terminal electron accepting conditions
Production of 14CO2 from [1,2-14C] dichloroethene (DCE) or [1,2-14C] vinyl chloride (VC) was quantified in aquifer and stream-bed sediment microcosms to evaluate the potential for microbial mineralization as a pathway for DCE and VC biodegradation under aerobic, Fe(III)-reducing, SO4-reducing, and methanogenic conditions. Mineralization of [1,2-14C] DCE and [1,2-14C] VC to 14CO2 decreased under inAuthorsP. M. Bradley, F. H. ChapelleAssessment of natural attenuation of aromatic hydrocarbons in groundwater near a former manufactured-gas plant, South Carolina, USA
Shallow, anaerobic groundwater near a former manufactured-gas plant (MGP) in Charleston, South Carolina, USA, contains mono- and polycyclic aromatic hydrocarbons (MAHs and PAHs, respectively). Between 1994 and 1997, a combination of field, laboratory, and numerical-flow and transport-model investigations were made to assess natural attenuation processes affecting MAH and PAH distributions. This asAuthorsJ. E. Landmeyer, F. H. Chapelle, M.D. Petkewich, P. M. Bradley - Web Tools
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