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Showing 1 to 20 of 30 for “"PFOS"”.
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Removal of Perfluorooctane Sulfonate (PFOS) and Related Compounds From Industrial Effluents
Perfluorooctane sulfonate (PFOS) and related perfluoroalkyl surfactants (PFAS) are ubiquitous contaminants of increasing public concern due to their environmental persistence, toxicity, and bioaccumulation. These perfluorinated compounds have been used for more than half a century in a wide variety …
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Perfluorooctanoic Acid (PFOA) and Perfluorooctane Sulfonate (PFOS) in an Aquatic Ecosystem - Distribution and Fate
… (PFOA) and perfluorooctane sulfonate (PFOS) belong to the family of perfluorinated surfactants (PFSs). They are widely distributed and persistent in the environment. For over 50 years, they have been used in numerous applications including paper and textile treatment, production of …
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IMPROVING CANNABIS SATIVA'S PHYTOREMEDIATION CAPABILITIES OF FOREVER CHEMICALS THROUGH MICROBIAL INOCULATIONS
… and distribution of perfluorooctane sulfonate (PFOS) in hydroponically grown hemp (Cannabis sativa L.). Plant height and stem diameter growth rates and biomass accumulation were compared across treatments with and without PFOS exposure and microbial inoculation. PFOS exposure and microbial …
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Adsorption of Single and Multi-Component Per-and Polyfluoroalkyl Substances (PFAS) at Air-Water Interfaces
… concentrations, perfluorooctanesulfonic acid (PFOS) adsorption was better predicted by the Freundlich isotherm than the Langmuir isotherm. Varying pore-water velocity revealed that lower velocities increased retardation at lower PFOS concentrations due to the presence of diffusion-limited …
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Towards understanding the fate of perfluoroalkyl compounds (PFCs) within urban environments: implications for human exposure.
Perfluorooctane sulfonate (PFOS) and perfluorooctanoic acid (PFOA) have been detected across the globe in a variety of media. The toxicity of these compounds and other precursors has led to concern about human exposure. The purpose of this thesis is to investigate the presence of perfluoroalkyl …
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Metabolic, neurotoxic and immunotoxic effects of PFAAs and their mixtures on the proteome of plasma and head kidney from rainbow trout
… (50 - 500 ng/L) and individual PFAAs (25 nM of PFOS, PFOA, PFBS or PFBA). Untargeted proteomics and phosphorylated metabolomics were conducted on the blood plasma and head kidney tissue to evaluate differences in biological effect for congeners and mixtures. The mixture and PFOS exposures …
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Investigating the impact of interacting with real world objects in virtual environments.
… and a decrease in percent of foot on step (PFOS) of 4.2% and 6.2%. There was a marked difference in the PFOS while subjects had a full body model instead of a feet only model, with 6.6% less with the full body model in the forest and 5.0% in the room. Overall, incorporating physical objects …
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Fate and Bioavailability of Per- and Poly-Fluorinated Substances (PFASs) in Soils
… Sorption (Kd) of perfluorooctane sulphonic acid (PFOS), 14C-PFOA and perfluorohexane sulphonic acid (PFHxS) was investigated in a wide range of Australian soils with varying properties. Modelling was conducted to determine if soil properties could predict sorption coefficients using two modelling …
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Detection of per- and polyfluoroalkyl substances in biosolids from wastewater treatment plants
… recoveries of 85.62 % and 114.65 % for PFOA and PFOS, respectively. The acidic SPE extraction showed relatively low recoveries for zwitterionic and ionic analytes. Totally 30 analytes were detected in two biosolid samples. PFOS were the predominant PFASs, with concentrations from 27.04 ng/g to …
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Detection and quantification of sub-micromolar concentrations of aqueous anions using infrared spectroscopy and mass spectrometry
… anions, specifically perfluoro-noctanesulfonate (PFOS–). A concentration of 0.6 ± 0.1 μM PFOS– was quantified in groundwater from a well at a fire-training area at Wurtsmith Air Force Base (WAFB), Oscoda, MI using the method of standard additions. Using the direct-injection method, detection down …
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Development of a Novel Perfluoroalkyl Substance Sequestration Scheme Using Alginate Macrobeads and Common Water Treatment Polymers
… enhancer for the PFASs perfluoroctanesulfonate (PFOS), perfluorooctanoate (PFOA), and perfluorononanoate (PFNA) and to elucidate potential removal mechanisms. In all cases, sorption of compounds increased beyond what can be explained by hydrophobic partitioning indicating the presence of …
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Navigating the Unregulated: A Multi-Tiered Public Health Risk Assessment of PFAS and N-DBPs Utilizing Unregulated Contaminant Monitoring Rule Data
… acid (PFOA), Perfluorooctane sulfonate (PFOS), and Perfluorodecanoic acid (PFDA)) contribute to non-carcinogenic risk, the short-chain Perfluorohexane sulfonic acid (PFHxS) exhibited a Hazard Quotient (HQ) that exceeded the safety threshold by over two orders of magnitude. For …
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Rh-Based Catalysis Chemistry of Aqueous-Phase Nitrogen Treatment Reactions
… treatment of perfluorooctane sulfonate (PFOS) contaminated water. In this work, the sorption properties of UiO-66 metal-organic frameworks (MOFs) with varying defect were studied for the removal of PFOS. Large pore defects (~16 and ~20 Å) within the framework were critical to increasing …
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Identifying the Feasible Maximum Contaminant Level for Per- and Polyfluoroalkyl Substances That Ensures Health and Safety While Maintaining Affordability and Equity of Drinking Water and Implementation of That Maximum Contaminant Level Within California by the State Water Resources Control Board
… Goal (PHG) of 0.007 ppt for PFOA and 1.0 ppt for PFOS within drinking water. On April 10, 2024, the Environmental Protection Agency issued a federal maximum contaminant level (MCL) of 4.0 ppt for both PFOA and PFOS. The objective of this proposal is to provide a recommendation to the SWRCB in …
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Geospatial Trends of Per- and Polyfluoroalkyl Substances (PFAS) Incidence in Private Drinking Water in Virginia
… levels (MCLs) for two PFAS compounds (PFOA and PFOS) in public water systems under the Safe Drinking Water Act. However, the 20-40 million Americans who rely on private drinking water supplies remain unregulated and comparatively understudied. This study investigates the incidence of PFAS in …
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Studium toxicity PFAS s využitím řas
… assessed for three substances that are banned PFOS (Perfluorooctanesulfonic acid), PFOA (Perfluorooctanoic acid) and PFHxS (Perfluorohexanesulfonic acid) and for two substances that are still on the market GenX (HFPO-DA, Hexafluoropropylene oxide dimer acid) and PFHxA (Undecanfluorohexanoic …
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Evaluation of PFAS in Environmental Solids: Retention Devices and a Screening Method
… relating concentrations of GenX, PFOA, and PFOS to SiF4 maximum peak area were created, and method detection limits and limits of quantitation were determined. The final method detection limits - 13.82, 13.18, and 15.31 µg F/g for GenX, PFOA, and PFOS respectively - are environmentally …
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TOWARD SUSTAINABLE CHEMICAL SUBSTANCES: DEVELOPMENT OF NOVEL APPROACH METHODOLOGIES TO STUDY IMMUNOTOXICITY OF PFAS
… (PFOA), sul perfluorottano sulfonato (PFOS), sull'acido perfluorononanoico (PFNA) e sul perfluoroesano sulfonico (PFHxS), che rappresentano il 90% delle concentrazioni di PFAS rilevabili nel sangue umano, questo studio ne ha analizzato gli effetti sulle cellule immunitarie e il …
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Fate and remediation of emerging organic contaminants in aquatic and soil environments
… PFASs (e.g., perfluorooctane sulfonate (PFOS)), including polystyrene- and polyacrylic-based AER, will require a combination of salt brine and co-solvent to desorb the PFOS and regenerate the AERs. This is consistent with the importance of both electrostatic and van der Waals interactions …
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Synthesis and Characterization of Wholly Aromatic, Water-Soluble Polyimides and Poly(amic acid)s Towards Fire Suppression Foams
… (PFCs) like perfluorooctanesulfonic acid (PFOS) and perfluorooctanoic acid (PFOA), which exhibit toxicity, bioaccumulation, and persistence in the environment resulting in the presence of fluorosurfactant chemicals in environments either through direct or secondary exposure via chemical …
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