A5053461072- Per- and polyfluoroalkyl substances research
- Toxic Organic Pollutants Impact
- Atmospheric chemistry and aerosols
- Pharmaceutical and Antibiotic Environmental Impacts
- Analytical chemistry methods development
- Air Quality and Health Impacts
- Carbon Dioxide Capture Technologies
- Chemical Analysis and Environmental Impact
- Effects and risks of endocrine disrupting chemicals
- Microplastics and Plastic Pollution
- Pesticide and Herbicide Environmental Studies
- Patient Safety and Medication Errors
- Membrane Separation and Gas Transport
- Fungal Biology and Applications
- Membrane Separation Technologies
- Groundwater flow and contamination studies
- Fluoride Effects and Removal
- Cancer Treatment and Pharmacology
- Medical Malpractice and Liability Issues
- Minerals Flotation and Separation Techniques
- Electronic Health Records Systems
- Gestational Diabetes Research and Management
- Healthcare Technology and Patient Monitoring
- Water Quality Monitoring and Analysis
- Environmental Justice and Health Disparities
Purdue University West Lafayette
2017-2025
State Street (United States)
2019-2024
Colorado School of Mines
2019-2023
Inha University
2014-2018
Inha University Hospital
2014
The widespread use of aqueous film-forming foam (AFFF) for firefighting activities (e.g., fire training to extinguish fuel-based fires at aircraft facilities) has led extensive groundwater and soil contamination by per- polyfluoroalkyl substances (PFASs) that are highly recalcitrant destruction using conventional treatment technologies. This study reports on the hydrothermal alkaline diverse PFASs present in AFFFs. Quantitative semiquantitative high-resolution mass spectrometry analyses...
Here, we report a promising new strategy for achieving rapid and complete destruction of perfluorooctanesulfonate (PFOS) through the application hydrothermal conditions (condensed water, 200–350 °C, 2–16.5 MPa) to solutions amended with NaOH. Initial screening experiments wide range solution amendments (e.g., acids, alkalis, oxidants, reductants) revealed highly variable extents PFOS defluorination, ranging from 0% 80% after 90 min reaction at 350 °C. The most reactive amendments, regardless...
Pressures to ban bisphenol A (BPA) has led the use of alternate chemicals such as BPA analogues S (BPS) and AF (BPAF) in production consumer products; however, information on their environmental fate is scarce. In this study, aerobic degradation BPA, BPAF, BPS at 100 μg/kg soil 22 ± 2 °C was monitored for up 180 days a forest an organic farm soil. At each sampling point, soils were extracted three times analyzed by liquid chromatography high resolution mass or time-of-flight spectrometry....
Composting the organic fraction of municipal solid waste (OFMSW) creates a nutrient rich soil amendment and reduces amounts wastes going to landfills or incineration. However, occurrence fate persistent challenging per- polyfluoroalkyl substances (PFAS) in OFMSW composts have not been well studied. The loads leachability 17 perfluoroalkyl acids (PFAAs) were analyzed nine commercial one backyard compost. PFAA ranged from 28.7 75.9 μg/kg for that included food packaging 2.38 7.60 did include...
With the pressure to ban or limit use of bisphenol A (BPA), production alternatives such as AF (BPAF) and S (BPS) are increasing, but little is known on their partitioning behavior for in assessing distribution ecosystem. Octanol–water (DowpH) soil-water were measured at several pH values BPA, BPAF, BPS. Sorption isotherms constructed from aqueous soil phase concentrations fit sufficiently well with a linear sorption model. pH-dependent was observed both octanol–water systems particularly...
Despite benefits to the firefighting industry, release of per- and polyfluoroalkyl substances (PFASs) from aqueous film-forming foam (AFFF) into aquatic systems poses significant risks human health other organisms. While anion-exchange technologies have proven be effective for removing perfluoroalkyl acids (PFAAs) water, their effectiveness diverse PFAS structures discovered in AFFF remains unknown. Here, we report on adsorption 75 PFASs, including 63 polyfluorinated substances, a diluted...
Hydrothermal alkaline treatment (HALT) can effectively degrade per- and polyfluoroalkyl substances (PFASs) present in aqueous film-forming foam (AFFF). However, information is lacking regarding the of PFASs actual groundwater soil from AFFF-impacted sites, especially for complex matrices. Given lack studies on direct PFAS destruction, we herein applied HALT to two samples three sites characterized destruction using high-resolution mass spectrometry. Results showed that 148 identified all...
Sites impacted by aqueous film-forming foam (AFFF) contain co-contaminants that can stimulate biotransformation of polyfluoroalkyl substances. Here, we compare how microbial enrichments from AFFF-impacted soil amended with diethyl glycol monobutyl ether (found in AFFF), aromatic hydrocarbons (present co-released fuels), acetate, and methane (substrates used or formed during bioremediation) impact the aerobic an AFFF-derived six-carbon electrochemical fluorination (ECF) precursor N-dimethyl...
Air-water interfacial retention of poly- and perfluoroalkyl substances (PFASs) is increasingly recognized as an important environmental process. Herein, column transport experiments were used to measure air-water partitioning values for several ethers PFASs derived from aqueous film-forming foam, while batch determine equilibrium Kia data compounds exhibiting evidence rate-limited partitioning. Experimental results suggest a Freundlich isotherm best describes PFAS at environmentally relevant...
Per- and polyfluoroalkyl substances (PFAS) are a class of synthetic chemicals with several applications. Multiple adverse health effects reported for longer carbon chain (≤C8) PFAS. Shorter PFAS, [e.g., hexafluoropropylene oxide dimer acid (HFPO–DA; GenX) perfluorobutanesulfonic (PFBS)] were introduced as alternatives. Past studies indicate that longer-chain PFAS neurotoxic targeting the dopamine pathway, but it is not known if shorter-chain act similarly. This study aimed to evaluate...
Predicting the transport of perfluoroalkyl acids (PFAAs) in vadose zone is critically important for PFAA site cleanup and risk mitigation. PFAAs exhibit several unusual poorly understood behaviors, including partitioning to air–water interface, which currently subject debate. This study develops a novel use quasi-saturated (residual air saturation) column experiments estimate chemical parameters both linear branched perfluorooctane sulfonate (PFOS) unsaturated soils. The ratio...
Per- and polyfluoroalkyl substances (PFAS) pose significant environmental human health risks thus require solutions for their removal destruction. However, PFAS cannot be destroyed by widely used processes like nanofiltration (NF). A few scarcely implemented advanced oxidation can degrade PFAS. In this study, we apply an electric field to a membrane system placing between reactive electrodes in crossflow configuration. The performance of perfluorooctanoic acid (PFOA) rejection, water flux,...
Global phase out of perfluorooctanesulfonic acid (PFOS) has led to increasing production alternatives such as the chlorinated polyfluoroalkyl ether sulfonic acids (Cl-PFESAs) for which little is known on their environmental fate. In this study, sorption by soils, aerobic soil biodegradation, and oxidation potential 6:2 Cl-PFESA (9-chlorohexadecafluoro-3-oxanonane-1-sulfonate) 8:2 (9-chlorooctadecafluoro-3-oxanonane-1-sulfonate) were evaluated. was quantified aqueous acetone/water solutions,...
Bench-scale experiments were performed to evaluate the electrochemical oxidation, <italic>via</italic> direct anodic oxidation and indirect from salt-derived species, of diluted aqueous film forming foam (AFFF) in brine solutions.
Researchers have developed numerous per- and polyfluoroalkyl substances (PFAS)-free aqueous film-forming foam (AFFF) formulations to replace PFAS-containing AFFF used for fire suppression. As part of the Department Defense's Strategic Environmental Research Development Program (SERDP), we examined direct lethal effects seven PFAS-free a on 14 aquatic species using series concentration (LC50) tests. We assessed LC10, LC50, LC90 values log–logistic logit analyses. Across all tested, discovered...
While foam fractionation (FF) process has emerged as a promising technology for removal of per- and polyfluoroalkyl substances (PFASs) from contaminated groundwater, management the resulting concentrates with elevated concentrations PFASs (e.g., >1 g/L) remains challenge. Here, we applied hydrothermal alkaline treatment (HALT) to two derived FF field demonstration projects that treated aqueous film-forming (AFFF)-impacted groundwater. Results showed >90% degradation defluorination within 90...
Per/polyfluoroalkyl substances (PFASs) are persistent organic contaminants that ubiquitous in surface waters. To date, their effects on aquatic systems, especially amphibians, poorly understood. We examined the uptake and depuration of perfluorooctanesulfonate (PFOS), perfluorohexanesulfonate (PFHxS), perfluorooctanoic acid (PFOA), 6:2 fluorotelomer sulfonate (6:2 FTS) northern leopard frog (Rana pipiens) tadpoles. Whole-body concentrations were every 10 d during constant aqueous exposure to...
Aqueous film-forming foams (AFFFs) are important sources of per- and polyfluoroalkyl substances (PFASs) in soil, groundwater, surface water. Soil microorganisms can convert polyfluorinated into persistent perfluoroalkyl acids, but the understanding co-contaminant stimulation or inhibition PFASs biotransformation is limited. In this study, we investigate how aerobic was affected by common AFFF co-contaminants, such as gasoline aromatics: benzene, toluene, ethylbenzene, o-xylene (BTEX). We...