A5046292580- Per- and polyfluoroalkyl substances research
- Toxic Organic Pollutants Impact
- Atmospheric chemistry and aerosols
- Carbon Dioxide Capture Technologies
- Chemical Analysis and Environmental Impact
- Air Quality and Health Impacts
- Groundwater flow and contamination studies
- Quantum Electrodynamics and Casimir Effect
- Fluoride Effects and Removal
- Acute Lymphoblastic Leukemia research
- Marine Biology and Environmental Chemistry
- Folate and B Vitamins Research
- Birth, Development, and Health
- Atmospheric Ozone and Climate
- Water Quality and Resources Studies
- Polymer composites and self-healing
- Gas Dynamics and Kinetic Theory
- Surface Modification and Superhydrophobicity
- Material Properties and Applications
- Effects and risks of endocrine disrupting chemicals
- Thermal Radiation and Cooling Technologies
- Groundwater and Isotope Geochemistry
- Microbial metabolism and enzyme function
- Pharmaceutical and Antibiotic Environmental Impacts
- Pharmacological Effects and Assays
Texas Tech University
2020-2025
Colorado School of Mines
2013-2020
Brown University
2018-2020
Subsurface transport potential of a suite perfluoroalkyl acids (PFAAs) was studied in batch sorption experiments with various soils and the presence co-contaminants relevant to aqueous film-forming foam (AFFF)-impacted sites. Specifically, PFAA multiple nonaqueous phase liquid (NAPL) nonfluorinated AFFF surfactants examined. This study is first report on perfluorobutanoate (PFBA) perfluoropentanoate (PFPeA) (log Koc = 1.88 1.37, respectively) found that these compounds does not follow...
Poly- and perfluoroalkyl substances (PFASs) are a class of fluorinated chemicals that utilized in firefighting have been reported groundwater soil at several firefighter training areas. In this study, samples were collected from across former area to examine the extent which remedial activities altered composition spatial distribution PFASs subsurface. Log Koc values for acids (PFAAs), estimated analysis paired aquifer solids, indicated solid/water partitioning was not entirely consistent...
Abstract Lithium-ion batteries (LiBs) are used globally as a key component of clean and sustainable energy infrastructure, emerging LiB technologies have incorporated class per- polyfluoroalkyl substances (PFAS) known bis-perfluoroalkyl sulfonimides (bis-FASIs). PFAS recognized internationally recalcitrant contaminants, subset which to be mobile toxic, but little is about environmental impacts bis-FASIs released during manufacture, use, disposal. Here we demonstrate that concentrations...
The source tracking of per- and polyfluoroalkyl substances (PFASs) is a new increasingly necessary subfield within environmental forensics. We define PFAS as the accurate characterization differentiation multiple sources contributing to contamination in environment. should employ analytical measurements, multivariate analyses, an understanding fate transport framework conceptual site model. Converging lines evidence used differentiate include: identification PFASs strongly associated with...
Per- and polyfluoroalkyl substances (PFAS) are difficult to analyze in environmental media due challenges such as extraction recovery lack of analytical standards. The total oxidizable precursor (TOP) assay suspect screening analysis coupled with semiquantitative (SQ) concentration estimates two approaches assess PFAS media, but studies needed optimize workstreams for analysis. This study applied soil methods, TOP assay, SQ three aqueous film-forming foams (AFFFs) AFFF-impacted soils. In...
Background: Multiple Northeast U.S. communities have discovered per- and polyfluoroalkyl substances (PFASs) in drinking water aquifers excess of health-based regulatory levels or advisories. Regional stakeholders (consultants, regulators, others) need technical background tools to mitigate risks associated with exposure PFAS-affected groundwater. Objectives: The aim was identify challenges faced by extend best practices other regions experiencing PFAS releases establish a framework for...
Targeted analysis for 24 Per- and Polyfluoroalkyl Substances (PFAS) was conducted on 10 insecticide formulations used a United States Department of Agriculture crop research field. Perfluorooctane sulfonic acid (PFOS) found in 6 the with concentrations ranging from 3.92 to 19.2 mg/kg. Further soil plant samples collected at site several additional PFAS, PFOS being most prominent. Suspect screening then provided suspected PFAS addition targeted analyzed 7 samples, one which showed no during...
Numerous US drinking water aquifers have been contaminated with per- and polyfluoroalkyl substances (PFAS) from fire-fighting fire-training activities using aqueous film-forming foam (AFFF). These sites often contain other organic compounds, such as fuel hydrocarbons methane, which may serve primary substrates for cometabolic (i.e., nongrowth-linked) biotransformation reactions. This work investigates the abilities of AFFF site relevant bacteria (methanotrophs, propanotrophs, octane,...
Varying transport potential of cationic, zwitterionic, and anionic per- polyfluoroalkyl substances (PFASs) may pose challenges for remediation aqueous film forming foam (AFFF) impacted sites, particularly during groundwater extraction. Slow desorption stronger sorbing, cationic PFASs cause extended times rebound in PFAS concentrations. Persulfate oxidation has the to convert a complex mixture into simpler more recoverable perfluoroalkyl acids (PFAAs). AFFF-impacted soils were treated with...
Abstract The occurrence of per‐ and polyfluoroalkyl substances (PFAS) in wastewater treatment plants (WWTPs) is well recognized. While several studies have examined the PFAS WWTPs, assessing extent to which unit processes impact phase distribution are relatively lacking. Herein, enrichment foams generated during aeration accumulation solids dewatering streams were evaluated WWTPs. Results this screening‐level study showed that perfluorooctane sulfonate (PFOS) concentrations enriched up three...
Sublimation vapor pressures of nine pure perfluoroalkyl substances, including ammonium perfluoro(2-methyl-3-oxahexanoate) (GenX), 1H,1H,2H,2H-perfluoro-1-decanol (8:2 FTOH), 1H,1H,2H,2H-perfluoro-1-dodecanol (10:2 and C6 to C11 perfluorocarboxylic acids (PFCAs), were measured using the Knudsen technique at near-ambient temperatures. Melting temperatures fusion enthalpies these compounds also by differential scanning calorimetry. The pressure GenX salt is comparable that much higher molecular...
Studies have identified hundreds of per- and polyfluoroalkyl substances (PFAS) in aqueous film forming foam (AFFF) using high resolution mass spectrometry (HRMS), there is increasing reliance on HRMS with suspect screening areas such as PFAS fate transport. Characterization active-use AFFF formulations crucial for maintaining representative lists efforts. Herein, targeted analysis, total oxidizable precursor assay (TOP), screening, non-targeted analysis were used to characterize an currently...
The extensive use of per- and polyfluoroalkyl substances (PFASs) in industrial consumer products has led to groundwater contamination, raising concerns for human health the environment. These persistent chemicals exist different forms with varying properties, which makes their removal challenging. In this study, we assessed effectiveness three β-cyclodextrin (β-CD) adsorbents at removing a mixture PFASs, including anionic, neutral, zwitterionic compounds, neutral pH. We calculated linear...
We evaluate the cytotoxicity, intracellular redox conditions, apoptosis, and methylation of DNMTs/TETs upon exposure to LiTFSI, a novel Per Polyfluoroalkyl Substances (PFAS) commonly found in lithium-ion batteries, on human renal carcinoma cells (A498) hepatoma (HepG2). The MTT (3-[4,5-dimethylthiazol-2-yl]-2,5 diphenyl tetrazolium bromide) assay showed both Perfluorooctane sulfonate (PFOS) Lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) had dose-dependent effect A498 HepG2, with LiTFSI...
We investigated the accumulation of per- and polyfluoroalkyl substances (PFAS) in earthworms (Eisenia andrei). Uptake kinetics bioaccumulation factors (BAFs) were determined using a mixture 16 PFAS by exposing to spiked artificial soil for up 28 d. Two treatments used, with low treatment targeting environmentally relevant concentrations. The concentrations remained relatively unchanged during exposures statistically significant rates uptake estimated most individual PFAS. For 0.01 mg/kg...