The gas phase retention volume behavior of organophosphate esters on polyurethane foam

In this study, the gas-phase retention volume behavior of four highly volatile organophosphate esters (OPEs) on polyurethane foam (PUF) was studied using a frontal chromatogram. The breakthrough volumes (VB) of trimethyl phosphate (TMP), triethyl phosphate (TEP), tripropyl phosphate (TPrP), and tri-n-butyl phosphate (TnBP) were 0.33, 0.59, 10.5, and 32.4 m3, respectively. A significant negative correlation was found between the logarithm value of VB and the subcooled liquid vapor pressure (PL) with an r2 of 0.905, indicating that the vapor penetration depends on both the volatility and total air volume. The enthalpy of desorption and vaporization (Delta HS- Delta HV) showed a significant difference between the tested OPEs and polycyclic aromatic hydrocarbons (PAHs), revealing that the strength of the sorption interaction of the tested OPEs vapor on PUF should be different from that of PAHs. The PUF-air partition coefficients (KPUF-air) of the tested OPEs ranged from 4.3 to 8.1, which were lower than those of three-to four-ring PAHs (7.02-10.2) and organochlorines (8.01-9.72), revealing that the partition of highly volatile OPEs on PUF is lower than that of low-volatile compounds. The PUF/XAD cartridge improved the absorption efficiency of the tested OPEs; however, its sorptive capacity was still limited.

Automated summary

This study examines the gas-phase retention volume behavior of highly volatile organophosphate esters (OPEs) on polyurethane foam (PUF) using a frontal chromatogram. The results show that vapor penetration depends on the volatility and total air volume, with a negative correlation between the logarithm value of breakthrough volume (VB) and subcooled liquid vapor pressure (PL). The enthalpy differences between OPEs and polycyclic aromatic hydrocarbons (PAHs) suggest different sorption interaction strengths with PUF. The partition coefficients (KPUF-air) of the tested OPEs on PUF are lower than those of PAHs and organochlorines.