Solid Vapor Pressure and Enthalpy of Sublimation for Perfluorooctanoic Acid

Abstract

A modified gas saturation method was used to determine the solid vapor pressure of perfluorooctanoic acid (PFOA) at ambient temperatures. Measurements were made over the temperature range from (25 to 45) °C. Pressures ranged from (5.2 to 40.7) Pa. The enthalpy of sublimation was calculated as 88.9 kJ • mol -1 .

Reaction of Perfluorooctanoic Acid with Criegee Intermediates and Implications for the Atmospheric Fate of Perfluorocarboxylic Acids

“…The concentration of PFOA in the flow is calculated from the pressure in the mixing vessel and the experimentally determined vapor pressure curves of PFOA. 38,39 From the literature we estimate uncertainty in PFOA vapor pressure of ~ 5 %. The mixing vessel was held below the temperature in the laboratory where experiments were performed to prevent PFOA condensation downstream.…”

Understanding the atmospheric measurement and behavior of perfluorooctanoic acid

“…The vapor pressure of PFOA has not, to our knowledge, been measured across the range of environmentally relevant temperatures. However, the reported measurement of P S at 27.1°C 28 is consistent with estimation using constants for Antoine's equation from experimental measurements at temperatures of 191 to 59°C 29. It is suggested that the uncertainty in the vapor pressure estimate is unlikely greater than the variability caused by the temperature variation of −0.8 to 35.5°C at the Kyoto and Albany sites during the sampling period (http://www.tutiempo.net/en/Climate/FUKUSHIMA/04-2005/475950.htm; http://weather-warehouse.com/WeatherHistory/PastWeatherData_AlbanyCntyArpt_Albany_NY_May.html; http://weather-warehouse.com/WeatherHistory/PastWeatherData_%20AlbanyCntyArpt_Albany_NY_June.html).…”

Perfluorooctanoic acid and ammonium perfluorooctanoate: volatile surfactants for proteome analysis?

“…Perfluorooctanoic acid (PFOA) was used industrially, until health concerns forced a phasing out of this environmentally persistent chemical . The attraction of PFOA to the proteomics experiments relates to its high volatility (5.2 Pa at 27 °C, rising to 40.7 Pa at 45.7 °C) . Consequentially, fluorinated surfactants have been dubbed MS‐compatible …”

“…[15] The attraction of PFOA to the proteomics experiments relates to its high volatility (5.2 Pa at 27 C, rising to 40.7 Pa at 45.7 C). [16] Consequentially, fluorinated surfactants have been dubbed MS-compatible. [12] Shepherd and Holzenburg first introduced ammonium perfluorooctanoate (APFO) to proteome processing as a surfactant for solubilizing membrane proteins.…”