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
Climate change and watershed mercury export: a multiple projection and model analysis
Occurrence and mobility of mercury in groundwater: Chapter 5
Optimizing stream water mercury sampling for calculation of fish bioaccumulation factors
Managing the effects of endocrine disrupting chemicals in wastewater-impacted streams
Arsenic in groundwater: a summary of sources and the biogeochemical and hydrogeologic factors affecting arsenic occurrence and mobility
Current perspectives in contaminant hydrology and water resources sustainability
Environmental factors that influence cyanobacteria and geosmin occurrence in reservoirs
Specific ultra-violet absorbance as an indicator measurement of merucry sources in an Adirondack River basin
Managing the impacts of endocrine disrupting chemicals in wastewater-impacted streams
A revolution in analytical instrumentation circa 1920 greatly improved the ability to characterize chemical substances [1]. This analytical foundation resulted in an unprecedented explosion in the design and production of synthetic chemicals during and post-World War II. What is now often referred to as the 2nd Chemical Revolution has provided substantial societal benefits; with modern chemical de
Assessing the relative bioavailability of DOC in regional groundwater systems
Influence of dietary carbon on mercury bioaccumulation in streams of the Adirondack Mountains of New York and the Coastal Plain of South Carolina, USA
Data visualization, time-series analysis, and mass-balance modeling of hydrologic and water-quality data for the McTier Creek watershed, South Carolina, 2007-2009
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Climate change and watershed mercury export: a multiple projection and model analysis
Future shifts in climatic conditions may impact watershed mercury (Hg) dynamics and transport. An ensemble of watershed models was applied in the present study to simulate and evaluate the responses of hydrological and total Hg (THg) fluxes from the landscape to the watershed outlet and in-stream THg concentrations to contrasting climate change projections for a watershed in the southeastern coastAuthorsHeather E. Golden, Christopher D. Knightes, Paul Conrads, Toby D. Feaster, Gary M. Davis, Stephen T. Benedict, Paul M. BradleyOccurrence and mobility of mercury in groundwater: Chapter 5
1. Introduction 1.1. FORMS, TOXICITY, AND HEALTH EFFECTS Mercury (Hg) has long been identified as an element that is injurious, even lethal, to living organisms. Exposure to its inorganic form, mainly from elemental Hg (Hg(0)) vapor (Fitzgerald & Lamborg, 2007) can cause damage to respiratory, neural, and renal systems (Hutton, 1987; USEPA, 2012; WHO, 2012). The organic form, methylmercury (CH3HgAuthorsJulia L. Barringer, Zoltan Szabo, Pamela A. ReillyOptimizing stream water mercury sampling for calculation of fish bioaccumulation factors
Mercury (Hg) bioaccumulation factors (BAFs) for game fishes are widely employed for monitoring, assessment, and regulatory purposes. Mercury BAFs are calculated as the fish Hg concentration (Hgfish) divided by the water Hg concentration (Hgwater) and, consequently, are sensitive to sampling and analysis artifacts for fish and water. We evaluated the influence of water sample timing, filtration, anAuthorsKaren Riva-Murray, Paul M. Bradley, Celeste A. Journey, Mark E. Brigham, Barbara C. Scudder Eikenberry, Christopher Knightes, Daniel T. ButtonManaging the effects of endocrine disrupting chemicals in wastewater-impacted streams
A revolution in analytical instrumentation circa 1920 greatly improved the ability to characterize chemical substances. This analytical foundation resulted in an unprecedented explosion in the design and production of synthetic chemicals during and post-World War II. What is now often referred to as the 2nd Chemical Revolution has provided substantial societal benefits; with modern chemical designAuthorsPaul M. Bradley, Dana W. KolpinArsenic in groundwater: a summary of sources and the biogeochemical and hydrogeologic factors affecting arsenic occurrence and mobility
Arsenic (As) is a metalloid element (atomic number 33) with one naturally occurring isotope of atomic mass 75, and four oxidation states (-3, 0, +3, and +5) (Smedley and Kinniburgh, 2002). In the aqueous environment, the +3 and +5 oxidation states are most prevalent, as the oxyanions arsenite (H3AsO3 or H2AsO3- at pH ~9-11) and arsenate (H2AsO4- and HAsO42- at pH ~4-10) (Smedley and Kinniburgh, 20AuthorsJulia L. Barringer, Pamela A. ReillyCurrent perspectives in contaminant hydrology and water resources sustainability
Human society depends on liquid freshwater resources to meet drinking, sanitation and hygiene, agriculture, and industry needs. Improved resource monitoring and better understanding of the anthropogenic threats to freshwater environments are critical to efficient management of freshwater resources and ultimately to the survival and quality of life of the global human population. This book helps adAuthorsPaul M. BradleyEnvironmental factors that influence cyanobacteria and geosmin occurrence in reservoirs
Phytoplankton are small to microscopic, free-floating algae that inhabit the open water of freshwater, estuarine, and saltwater systems. In freshwater lake and reservoirs systems, which are the focus of this chapter, phytoplankton communities commonly consist of assemblages of the major taxonomic groups, including green algae, diatoms, dinoflagellates, and cyanobacteria. Cyanobacteria are a diversAuthorsCeleste A. Journey, Karen M. Beaulieu, Paul M. BradleySpecific ultra-violet absorbance as an indicator measurement of merucry sources in an Adirondack River basin
The Adirondack region of New York has been identified as a hot spot where high methylmercury concentrations are found in surface waters and biota, yet mercury (Hg) concentrations vary widely in this region. We collected stream and groundwater samples for Hg and organic carbon analyses across the upper Hudson River, a 493 km2 basin in the central Adirondacks to evaluate and model the sources of varAuthorsDouglas A. Burns, George R. Aiken, Paul M. Bradley, Celeste A. Journey, Jakob SchelkerManaging the impacts of endocrine disrupting chemicals in wastewater-impacted streams
A revolution in analytical instrumentation circa 1920 greatly improved the ability to characterize chemical substances [1]. This analytical foundation resulted in an unprecedented explosion in the design and production of synthetic chemicals during and post-World War II. What is now often referred to as the 2nd Chemical Revolution has provided substantial societal benefits; with modern chemical de
AuthorsCeleste A. Journey, Paul M. Bradley, Dana W. KolpinAssessing the relative bioavailability of DOC in regional groundwater systems
It has been hypothesized that the degree to which a hyperbolic relationship exists between concentrations of dissolved organic carbon (DOC) and dissolved oxygen (DO) in groundwater may indicate the relative bioavailability of DOC. This hypothesis was examined for 73 different regional aquifers of the United States using 7745 analyses of groundwater compiled by the National Water Assessment (NAWQA)AuthorsFrancis H. Chapelle, Paul M. Bradley, Celeste A. Journey, Peter B. McMahonInfluence of dietary carbon on mercury bioaccumulation in streams of the Adirondack Mountains of New York and the Coastal Plain of South Carolina, USA
We studied lower food webs in streams of two mercury-sensitive regions to determine whether variations in consumer foraging strategy and resultant dietary carbon signatures accounted for observed within-site and among-site variations in consumer mercury concentration. We collected macroinvertebrates (primary consumers and predators) and selected forage fishes from three sites in the Adirondack MouAuthorsKaren Riva-Murray, Paul M. Bradley, Lia C. Chasar, Daniel T. Button, Mark E. Brigham, Barbara C. Scudder Eikenberry, Celeste A. Journey, Michelle A. LutzData visualization, time-series analysis, and mass-balance modeling of hydrologic and water-quality data for the McTier Creek watershed, South Carolina, 2007-2009
The McTier Creek watershed is located in the headwaters of the Edisto River Basin, which is in the Coastal Plain region of South Carolina. The Edisto ecosystem has some of the highest recorded fish-tissue mercury concentrations in the United States. In an effort to advance the understanding of the fate and transport of mercury in stream ecosystems, the U.S. Geological Survey, as part of its NationAuthorsStephen T. Benedict, Paul Conrads, Toby D. Feaster, Celeste A. Journey, Heather E. Golden, Christopher D. Knightes, Gary M. Davis, Paul M. Bradley - Web Tools
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