On the Chemical Pathways Influencing the Effective Global Warming Potential of Commercial Hydrofluoroolefin Gases

Salierno, Gabriel

doi:10.1002/cssc.202400280

Cited by 3 publications

(1 citation statement)

References 110 publications

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“…Further, destructive techniques for concentrated TFA may lead to harmful byproducts. At high temperatures (> 170°C) and certain conditions, TFA can be converted to the potent greenhouse gas fluoroform (CF3H) 60 , which may be relevant in the context of heating or burning organic matter or RO brine concentrates containing TFA.…”

Section: Increasing Planetary Exposurementioning

confidence: 99%

The global threat from the irreversible accumulation of trifluoroacetic acid (TFA)

Arp,

Gredelj,

Glüge

et al. 2024

Preprint

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Trifluoroacetic acid (TFA) is a hydrophilic, non-degradable substance that has been increasing in concentrations within diverse environmental media, including rain, soils, human serum, plants, plant-based foods, and drinking water. Currently, TFA concentrations are orders of magnitude higher than those of other per- and polyfluoroalkyl substances (PFAS). This accumulation is due to many PFAS that have TFA as a transformation byproduct, including several fluorinated gases (F-gases), high-volume pesticides, pharmaceuticals and industrial chemicals, in addition to direct industrial release. Due to TFA’s extreme persistence and mobility, these concentrations are increasing irreversibly. What remains less clear is the thresholds where irreversible effects on local or global scales occur. There are indications from mammalian toxicity studies that TFA is toxic to reproduction and that it exhibits liver toxicity. Ecotoxicity data are scarce, with most data for aquatic systems; fewer data are available for terrestrial plants, where TFA bioaccumulates most readily. Collectively, these trends imply that TFA meets the criteria of a planetary boundary threat for novel entities because of increasing planetary-scale exposure, where potential, irreversible disruptive impacts on vital earth system processes could occur. The rational response to this is to instigate binding actions to reduce emissions of TFA and its many precursors.

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Section: Increasing Planetary Exposurementioning

confidence: 99%

The global threat from the irreversible accumulation of trifluoroacetic acid (TFA)

Arp,

Gredelj,

Glüge

et al. 2024

Preprint

View full text Add to dashboard Cite

show abstract

The Global Threat from the Irreversible Accumulation of Trifluoroacetic Acid (TFA)

Arp,

Gredelj,

Glüge

et al. 2024

Environ. Sci. Technol.

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Trifluoroacetic acid (TFA) is a persistent and mobile substance that has been increasing in concentration within diverse environmental media, including rain, soils, human serum, plants, plant-based foods, and drinking water. Currently, TFA concentrations are orders of magnitude higher than those of other per-and polyfluoroalkyl substances (PFAS). This accumulation is due to many PFAS having TFA as a transformation product, including several fluorinated gases (F-gases), pesticides, pharmaceuticals, and industrial chemicals, in addition to direct release of industrially produced TFA. Due to TFA's extreme persistence and ongoing emissions, concentrations are increasing irreversibly. What remains less clear are the thresholds where irreversible effects on local or global scales occur. There are indications from mammalian toxicity studies that TFA is toxic to reproduction and that it exhibits liver toxicity. Ecotoxicity data are scarce, with most data being for aquatic systems; fewer data are available for terrestrial plants, where TFA bioaccumulates most readily. Collectively, these trends imply that TFA meets the criteria of a planetary boundary threat for novel entities because of increasing planetary-scale exposure, where potential irreversible disruptive impacts on vital earth system processes could occur. The rational response to this is to instigate binding actions to reduce the emissions of TFA and its many precursors.

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Electronic Spectroscopy of the Halogenated Criegee Intermediate, ClCHOO: Experiment and Theory

Karlsson,

Rabayah,

Liu

et al. 2024

J. Phys. Chem. A

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A chlorine-substituted Criegee intermediate, ClCHOO, is photolytically generated using a diiodo precursor, detected by VUV photoionization at 118 nm, and spectroscopically characterized via ultraviolet−visible (UV−vis)induced depletion of m/z = 80 under jet cooled conditions. UV−vis excitation resonant with a π* ← π transition yields a significant ground state depletion, indicating a strong electronic transition and rapid photodissociation. The broad absorption spectrum peaks at 350 nm and is attributed to contributions from both syn (∼70%) and anti (∼30%) conformers of ClCHOO based on spectral simulations using a nuclear ensemble method. Electronic structure theory shows significant differences in the vertical excitation energies of the two conformers (330 and 371 nm, respectively) as well as their relative stabilities in the ground and excited electronic states associated with the π* ← π transition. Natural bond orbital analysis reveals significant and nonintuitive nonbonding contributions to the relative stabilities of the syn and anti conformers.

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On the Chemical Pathways Influencing the Effective Global Warming Potential of Commercial Hydrofluoroolefin Gases

Cited by 3 publications

References 110 publications

The global threat from the irreversible accumulation of trifluoroacetic acid (TFA)

The global threat from the irreversible accumulation of trifluoroacetic acid (TFA)

The Global Threat from the Irreversible Accumulation of Trifluoroacetic Acid (TFA)

Electronic Spectroscopy of the Halogenated Criegee Intermediate, ClCHOO: Experiment and Theory

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