Comprehensive review of combustion ion chromatography for the analysis of total, adsorbable, and extractable organic fluorine

Journal of Separation Science, Journal Year: 2024, Volume and Issue: 47(15)

Published: Aug. 1, 2024

Poly- and perfluoroalkyl substances (PFAS) are a class of persistent organic pollutants whose high stability appreciable water solubility have led to near-global contamination. PFAS bioaccumulative toxins that been linked myriad disorders detected nearly universally in human blood. Liquid chromatography-tandem mass spectrometry is the most frequent method used for quantitation, though this typically only measures few dozen >14 000 known has shown account small portion total fluorine present. Sum parameter methods such as total, extractable, adsorbable emerged alternative measurements determination. Combustion ion chromatography become preferred organofluorine measurement where sorbent or extract containing combusted emitted hydrofluoric acid (HF) measure cumulative Herein we critically review types measurement, their separation from sample matrix, key parameters analytical instrument affect sensitivity, reproducibility, recovery with regards analysis.

Language: Английский

---

New Insights into Thermal Degradation Products of Long-Chain Per- and Polyfluoroalkyl Substances (PFAS) and Their Mineralization Enhancement Using Additives

Environmental Science & Technology, Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 3, 2024

The products of incomplete destruction (PIDs) per- and polyfluoroalkyl substances (PFAS) represent a substantial ambiguity when employing thermal treatments to remediate PFAS-contaminated materials. In this study, we present new information on PIDs produced in both inert oxidative environments from five long-chain PFAS, including three now regulated under the U.S. Safe Drinking Water Act, one cationic precursor compound, C10 PFAS. data did not support generation tetrafluoromethane any studied carbonyl fluoride was found only potassium perfluorooctanesulfonate (K-PFOS) heated air narrow temperature range. Oxidative conditions (air) were observed facilitate PFAS degradation accelerate mineralization K-PFOS. Spectroscopic suggest that is initiated by cleavage bonds form perfluoroalkyl radicals, leading organofluorine (e.g., perfluoroalkenes). air, radicals react with oxygen oxygen-containing PIDs. enhanced adding solid additives, which categorized as highly effective granular activated carbon (GAC) certain noble metals), moderately effective, noneffective. Remarkably, simply GAC, achieved >90% perfluorooctanoic acid at 300 °C ∼1.9 atm within just 60 min without using water or solvents.

Language: Английский

---

Influence of reactor composition on the thermal decomposition of perfluorooctanesulfonic acid (PFOS)

Journal of Hazardous Materials, Journal Year: 2023, Volume and Issue: 461, P. 132665 - 132665

Published: Sept. 30, 2023

Language: Английский

---

Reaction rate coefficient study of the perfluoroalkyl and ω-Perfluoroalkyloic acid radicals

Chemical Physics Letters, Journal Year: 2024, Volume and Issue: 838, P. 141077 - 141077

Published: Jan. 10, 2024

Language: Английский

---

Head Group Dependence and Kinetic Bottlenecks of Gas- phase Thermal PFAS Destruction

Published: June 18, 2024

Varying and sometimes con[icting temperatures products have been reported from studies addressing thermal PFAS destruction, often because decomposition pathways are highly dependent on the respective experimental system. Here we applied highest-level coupled cluster calculations to isolate identify major processes during destruction in gas phase with relevance incineration, oxidation, other treatment technologies which their volatile desorb into phase. All investigated per[uoroalkyl acids decompose via unimolecular head group loss, either through HF elimination or homolytic bond cleavage as a function of type. In contrast, all [uorotelomers undergo initial hydrogen abstraction characteristic C2H4 moiety by hydroxyl radicals under representative incineration conditions, followed radical decomposition. Subsequent formation per[uoroalkanes including CF4 can then be prevented supplying su`cient donors such hydrocarbon fuel water well scavenging released [uorine. This leads generation stable 1H-per[uoroalkanes. While parent proceeds at gas-phase ≤700 °C, carbon-carbon 1H-per[uoroalkanes requires up ~950 °C 2 seconds residence time, making this step kinetic bottleneck way complete mineralization.

Language: Английский

---

High temperature behaviour of Ag-exchanged Y zeolites used for PFAS sequestration from water

Physical Chemistry Chemical Physics, Journal Year: 2023, Volume and Issue: 25(29), P. 20066 - 20075

Published: Jan. 1, 2023

Per- and polyfluorinated alkyl substances (PFAS) are anthropogenic compounds which have recently drawn great attention due to their high biological, chemical physical stability lipid/water repelling properties. The present work aims provide for the first time insights on thermal behaviour of Ag-exchanged Y zeolite loaded with perfluorooctanoic acid (PFOA, C8HF15O2) perfluorooctane sulfonate (PFOS, C8HF17O3S) emphasizing close link between crystal structure desorption/dehydration processes. Elemental isotopic abundance carbon analysis, in situ high-temperature synchrotron X-ray powder diffraction were used evaluate critically if regeneration affects initial zeolites structural features. Rietveld refinements revealed that PFAS sites emptied 550-650 °C temperature range, when degradation PFOA PFOS reached. crystallinity samples is not affected by adsorption/desorption Upon heating, removal both coadsorbed water molecules induced a cation migration silver ions changes geometry framework. dimensions channels remain comparable those pristine materials thus suggesting potential re-use other adsorption cycles. Additionally, once regenerated reloaded can re-adsorb amounts adsorbed cycle clear benefits costs whole treatment process.

Language: Английский

---

PFOA-contaminated soil remediation: a comprehensive review

Environmental Science and Pollution Research, Journal Year: 2024, Volume and Issue: 31(38), P. 49985 - 50011

Published: Aug. 1, 2024

Language: Английский

---

Thermal mineralization of Perfluorooctanoic acid (PFOA): The synergistic role of oxygen and water vapor inhibiting products of incomplete destruction (PID) formation

Chemical Engineering Science, Journal Year: 2024, Volume and Issue: 301, P. 120659 - 120659

Published: Sept. 1, 2024

Language: Английский

---

Pyrolysis of Two Perfluoroalkanesulfonates (PFSAs) and PFSA-Laden Granular Activated Carbon (GAC): Decomposition Mechanisms and the Role of GAC

Environmental Science & Technology, Journal Year: 2024, Volume and Issue: 58(49), P. 21850 - 21860

Published: Nov. 26, 2024

Thermal treatment of perfluoroalkyl and polyfluoroalkyl substances (PFASs) presents a promising opportunity to halt the PFAS cycle. However, how co-occurring materials such as granular activated carbon (GAC) influence thermal decomposition products PFASs, underlying mechanisms remain unclear. We studied pyrolysis two potassium salts perfluoroalkanesulfonates (PFSAs, C

Language: Английский

---

Atomic connectivity group contribution method for predicting the boiling and melting points of organic compounds

Chemical Engineering Science, Journal Year: 2023, Volume and Issue: 282, P. 119357 - 119357

Published: Oct. 4, 2023

Language: Английский

---