Solid Vapor Pressure and Enthalpy of Sublimation for Ammonium Perfluorooctanoate
Abstract
A modified gas saturation method was used to directly determine the solid vapor pressure of ammonium perfluorooctanoate (APFO). Measurements were made over the temperature range from (45 to 60) °C. Pressures ranged from (0.04 ± 0.007) Pa to (0.17 ± 0.028) Pa. A relationship was developed for determining vapor pressure as a function of temperature for conditions near the test range, and an environmentally relevant vapor pressure of (0.003 ± 0.0005) Pa was calculated at 25 °C. This ambient vapor pressure for the ammonium salt of perfluorooctanoate (PFO) is 3 orders of magnitude lower than the ambient vapor pressure of the acid form, perfluorooctanoic acid (PFOA), which is approximately 4.1 Pa at 25 °C. This finding underscores the importance of knowing what compound is present in the environment and using the appropriate properties to be able to predict environmental fate and transport behavior. The enthalpy of sublimation was calculated as 90.9 kJ·mol −1 . It is hypothesized that APFO may undergo a multistage sublimation process.
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To accurately estimate the vapor pressure and environmental transport potential of PFAS, it is necessary to determine their exact chemical nature in the environment.
“To accurately estimate the vapor pressure and environmental transport potential of PFAS, it is therefore necessary to determine their exact chemical nature in the environment, as different chemical forms can have very different vapor pressures [23].”
From The EU’s Per- and Polyfluoroalkyl Substances (PFAS) Ban: A Case of Policy over Science (2023) · cites this paper as [23]
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- Authors
- Barton, C. A., Botelho, M. A., & Kaiser, M. A.
- Affiliations
- DuPont (United States) (US)
- Corresponding author
- Barton, Catherine A.
- Venue
- Journal of Chemical & Engineering Data
- Publisher
- American Chemical Society (ACS)
- Published
- 2009-01-16
- Volume
- 54
- Issue
- 3
- Pages
- 752-755
- ISSN
- 0021-9568 (ISSN-L)
- 1520-5134
- OpenAlex
- W1996371794
- Cited by
- 18
- References
- 5
- Citations by year
- 2026: 1 · 2024: 1 · 2023: 2 · 2022: 3 · 2021: 1 · 2020: 1 · 2017: 1 · 2013: 3 · 2012: 2
- FWCI
- 1.27
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Journal of Chemical & Engineering Data (publishedVersion)
- Topics
- Physical Sciences › Environmental Science › Environmental Chemistry › Per- and polyfluoroalkyl substances research
- Physical Sciences › Chemistry › Organic Chemistry › Chemical Thermodynamics and Molecular Structure
- Physical Sciences › Engineering › Biomedical Engineering › Phase Equilibria and Thermodynamics
- Keywords
- ammonium perfluorooctanoate, enthalpy of sublimation, perfluorooctanoic acid, perfluorinated compounds, environmental fate and transport, fluorinated surfactants
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