A5022593051- Toxic Organic Pollutants Impact
- Per- and polyfluoroalkyl substances research
- Pharmaceutical and Antibiotic Environmental Impacts
- Environmental Toxicology and Ecotoxicology
- Isotope Analysis in Ecology
- Microbial bioremediation and biosurfactants
- Effects and risks of endocrine disrupting chemicals
- Atmospheric chemistry and aerosols
- Water Quality and Resources Studies
- Fish Ecology and Management Studies
- Mercury impact and mitigation studies
- Atmospheric and Environmental Gas Dynamics
- Water Quality and Pollution Assessment
- Groundwater flow and contamination studies
- Analytical chemistry methods development
- Water Treatment and Disinfection
- Environmental Justice and Health Disparities
- Environmental DNA in Biodiversity Studies
- Fluoride Effects and Removal
- Heavy metals in environment
- Petroleum Processing and Analysis
- Wastewater Treatment and Reuse
- Hydrocarbon exploration and reservoir analysis
- Forensic Fingerprint Detection Methods
- Mass Spectrometry Techniques and Applications
Environmental Protection Agency
2015-2024
Ohio Environmental Protection Agency
2015-2023
Government of the United States of America
2023
University of Alberta
2017
VA Office of Research and Development
2015
United States Bureau of Reclamation
2012
Research Triangle Park Foundation
2012
Colorado School of Mines
2012
Illinois Environmental Protection Agency
2012
Texas A&M University
1997-2004
Surface water from 38 streams nationwide was assessed using 14 target-organic methods (719 compounds). Designed-bioactive anthropogenic contaminants (biocides, pharmaceuticals) comprised 57% of 406 organics detected at least once. The 10 most-frequently anthropogenic-organics included eight pesticides (desulfinylfipronil, AMPA, chlorpyrifos, dieldrin, metolachlor, atrazine, CIAT, glyphosate) and two pharmaceuticals (caffeine, metformin) with detection frequencies ranging 66–84% all sites....
The presence of perfluoroalkyl acids (PFAAs) in biosolids destined for use agriculture has raised concerns about their potential to enter the terrestrial food chain via bioaccumulation edible plants. Uptake PFAAs by greenhouse lettuce (Lactuca sativa) and tomato (Lycopersicon lycopersicum) grown an industrially impacted biosolids-amended soil, a municipal control soil was measured. Bioaccumulation factors (BAFs) were calculated portions both tomato. Dry weight concentrations observed amended...
Crop uptake of perfluoroalkyl acids (PFAAs) from biosolids-amended soil has been identified as a potential pathway for PFAA entry into the terrestrial food chain. This study compared PFAAs in greenhouse-grown radish (Raphanus sativus), celery (Apium graveolens var. dulce), tomato (Lycopersicon lycopersicum), and sugar snap pea (Pisum sativum macrocarpon) an industrially impacted soil, municipal control soil. Individual concentrations PFAAs, on dry weight basis, mature, edible portions crops...
Abstract The use of aqueous film‐forming foam (AFFF) has resulted in the widespread occurrence per‐ and polyfluoroalkyl substances (PFAS) groundwater, drinking water, soils, sediments, receiving waters throughout United States other countries. We present research development efforts to date by Strategic Environmental Research Development Program (SERDP) Security Technology Certification (ESTCP) measure PFAS environment, characterize AFFF‐associated sources PFAS, understand fate behavior...
Wastewater is a source for many contaminants of emerging concern (CECs), and surface waters receiving wastewater discharge often serve as water downstream drinking treatment plants. Nontargeted analysis suspect screening methods were used to characterize chemicals in residence-time-weighted grab samples companion polar organic chemical integrative samplers (POCIS) collected on three separate hydrologic sampling events along flow path representative de facto reuse. The goal this work was...
We investigated aquatic insect utilization and PCB exposure in riparian spiders at the Lake Hartwell Superfund site (Clemson, SC). sampled sediments, adult chironomids, terrestrial insects, (Tetragnathidae, Araneidae, Mecynogea lemniscata), upland (Araneidae) along a sediment contamination gradient. Stable isotopes (delta(13)C, delta(15)N) indicated that primarily consumed insects whereas insects. PCBs chironomids (mean 1240 ng/g among sites) were 2 orders of magnitude higher than (15.2...
We investigated polychlorinated biphenyl (PCB) bioaccumulation relative to octanol−water partition coefficient (KOW) and organism trophic position (TP) at the Lake Hartwell Superfund site (South Carolina). measured PCBs (127 congeners) stable isotopes (δ15N) in sediment, organic matter, phytoplankton, zooplankton, macroinvertebrates, fish. TP, as calculated from δ15N, was significantly, positively related PCB concentrations, food web magnification factors (TMFs) ranged 1.5−6.6 among...
Glycolipids produced by Rhodococcus species H13-A and a representative synthetic surfactant Tween-80 (polyoxyethylene sorbitan monooleate) were used to demonstrate enhanced substrate "solubility" (aqueous-plus-micellar phase) in the presence of surfactants. Nascent concentrations naphthalene its methyl-substituted derivatives crude oil as polycyclic aromatic hydrocarbons for study. Both biosurfactant glycolipids from lowered surface tension aqueous solutions 72 ∼30 dyn/cm. The two-ring...
Consumption of emergent aquatic insects by terrestrial invertebrates is a poorly resolved, but potentially important, mechanism contaminant flux across ecosystem borders leading to exposure in invertivores. We characterized the spatial extent and magnitude transfer from sediments invertebrate predators examining riparian araneid spiders, insects, for stable isotopes polychlorinated biphenyls (PCBs, sum 141 congeners) at Lake Hartwell, (Clemson, South Carolina, USA). PCB concentrations were...
Industrial chemical contamination within coastal regions of the Great Lakes can pose serious risks to wetland habitat and offshore fisheries, often resulting in fish consumption advisories that directly affect human wildlife health. Mercury (Hg) is a contaminant concern many these highly urbanized industrialized regions, one which Saint Louis River estuary (SLRE), second largest tributary Lake Superior. The SLRE has legacy Hg drives high concentrations sediments, but it unclear whether...
Abstract Riparian spiders are being used increasingly to track spatial patterns of contaminants in and fluxing from aquatic ecosystems. However, our understanding the circumstances under which effective sentinels pollution is limited. The present study tests hypothesis that riparian may be effectively sediment by polychlorinated biphenyls (PCBs) ecosystems with high habitat heterogeneity. pattern ΣPCB concentrations 2 common families sampled 2011 2013 generally tracked variation ΣPCBs across...
Abstract Polycyclic aromatic hydrocarbons (PAHs) are among the most widespread and potentially toxic contaminants in Great Lakes (USA/Canada) tributaries. The sources of PAHs numerous diverse, identifying primary source(s) can be difficult. present study used multiple lines evidence to determine likely surficial streambed sediments at 71 locations across 26 Basin watersheds. Profile correlations, principal component analysis, positive matrix factorization source‐receptor modeling, mass...
The transfer of aquatic contaminants, including mercury (Hg), to terrestrial food webs is an often-overlooked exposure pathway animals. While research has implemented the use shoreline spiders assess Hg transfer, it unclear whether sources, estimated from isotope ratios, can be successfully resolved inform site assessments and remedy effectiveness. To examine we collected (Tetragnatha spp.) insect larvae (suborder Anisoptera) across a mosaic habitats in St. Louis River Bad River, tributaries...
Abstract The potential for polycyclic aromatic hydrocarbon (PAH)-related effects in benthic organisms is commonly estimated from organic carbon-normalized sediment concentrations based on equilibrium partitioning (EqP). Although this approach useful screening purposes, it may overestimate PAH bioavailability by orders of magnitude some sediments, leading to inflated exposure estimates and potentially unnecessary remediation costs. Recently, passive samplers have been shown provide an...