Limits...
Neutral poly-/perfluoroalkyl substances in air and snow from the Arctic.

Xie Z, Wang Z, Mi W, Möller A, Wolschke H, Ebinghaus R - Sci Rep (2015)

Bottom Line: A significant log-linear relationship was observed between the gas/particle partition coefficient and vapor pressure of the neutral PFASs.For fluorotelomer alcohol (FTOHs) and fluorotelomer acrylates (FTAs), the air-snow exchange fluxes were positive, indicating net evaporative from snow into air, while net deposition into snow was observed for perfluorooctane sulfonamidoethanols (Me/EtFOSEs) in winter and spring of 2012.Air-snow exchange may significantly interfere with atmospheric concentrations of neutral PFASs in the Arctic.

View Article: PubMed Central - PubMed

Affiliation: Helmholtz-Zentrum Geesthacht, Centre for Materials and Coastal Research, Institute of Coastal Research, Department for Environmental Chemistry, Geesthacht, 21502, Germany.

ABSTRACT
Levels of neutral poly-/perfluoroalkyl substances (nPFASs) in air and snow collected from Ny-Ålesund were measured and their air-snow exchange was determined to investigate whether they could re-volatilize into the atmosphere driven by means of air-snow exchange. The total concentration of 12 neutral PFASs ranged from 6.7 to 39 pg m(-3) in air and from 330 to 690 pg L(-1) in snow. A significant log-linear relationship was observed between the gas/particle partition coefficient and vapor pressure of the neutral PFASs. For fluorotelomer alcohol (FTOHs) and fluorotelomer acrylates (FTAs), the air-snow exchange fluxes were positive, indicating net evaporative from snow into air, while net deposition into snow was observed for perfluorooctane sulfonamidoethanols (Me/EtFOSEs) in winter and spring of 2012. The air-snow exchange was snow-phase controlled for FTOHs and FTAs, and controlled by the air-phase for FOSEs. Air-snow exchange may significantly interfere with atmospheric concentrations of neutral PFASs in the Arctic.

No MeSH data available.


Neutral PFASs concentrations in Arctic snow.Graph indicating the concentration of the neutral PFASs in snow samples collected from Ny-Ålesund, the Arctic.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC4352854&req=5

f4: Neutral PFASs concentrations in Arctic snow.Graph indicating the concentration of the neutral PFASs in snow samples collected from Ny-Ålesund, the Arctic.

Mentions: Snow sampling was conducted on glaciers around Ny-Ålesund during January and May 2012 (Figure 1, Table S4). The concentrations of neutral PFASs in the Arctic snow samples are summarized in Table S3 and Figure 4. The range of the total concentration was from 334 to 692 pg L−1 with an average value of 523 pg L−1. To our knowledge, there are few reports on PFAS concentrations in snow, thus it is hard to compare these values with those from other regions. Similar to the situation in air, 8:2 FTOH is the dominant species in the Arctic snow, accounting for 45% of the total concentration. ΣFTOHs in snow were between 218 and 507 pg L−1 (mean: 369 pg L−1). The composition of the 12 PFASs in snow was different to that in air. Besides 8:2 FTOH; 10:2 FTOH, MeFOSE and 12:2 FTOH were the three most abundant species, representing 18%, 11% and 6.5% of the ΣPFASs in snow, respectively (Table S3). The difference between the compositions in air and snow might be caused by different degradation processes for neutral PFASs in air and snow, and different air-snow exchange potentials of individual chemicals23. The average ratio of 8:2 to 10:2 to 6:2 to 12:2 FTOH was 56.2:22.5:1.0:8.1 in snow. However, to date, there has been few data such ratios in snow, thus it is hard to compare the variation between Arctic and urban areas. The ratios in snow are considerably higher than those in air, and could be explained by the higher volatilization potential of 6:2 FTOH and by different degradation processes of FTOHs in air and snow.


Neutral poly-/perfluoroalkyl substances in air and snow from the Arctic.

Xie Z, Wang Z, Mi W, Möller A, Wolschke H, Ebinghaus R - Sci Rep (2015)

Neutral PFASs concentrations in Arctic snow.Graph indicating the concentration of the neutral PFASs in snow samples collected from Ny-Ålesund, the Arctic.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4352854&req=5

f4: Neutral PFASs concentrations in Arctic snow.Graph indicating the concentration of the neutral PFASs in snow samples collected from Ny-Ålesund, the Arctic.
Mentions: Snow sampling was conducted on glaciers around Ny-Ålesund during January and May 2012 (Figure 1, Table S4). The concentrations of neutral PFASs in the Arctic snow samples are summarized in Table S3 and Figure 4. The range of the total concentration was from 334 to 692 pg L−1 with an average value of 523 pg L−1. To our knowledge, there are few reports on PFAS concentrations in snow, thus it is hard to compare these values with those from other regions. Similar to the situation in air, 8:2 FTOH is the dominant species in the Arctic snow, accounting for 45% of the total concentration. ΣFTOHs in snow were between 218 and 507 pg L−1 (mean: 369 pg L−1). The composition of the 12 PFASs in snow was different to that in air. Besides 8:2 FTOH; 10:2 FTOH, MeFOSE and 12:2 FTOH were the three most abundant species, representing 18%, 11% and 6.5% of the ΣPFASs in snow, respectively (Table S3). The difference between the compositions in air and snow might be caused by different degradation processes for neutral PFASs in air and snow, and different air-snow exchange potentials of individual chemicals23. The average ratio of 8:2 to 10:2 to 6:2 to 12:2 FTOH was 56.2:22.5:1.0:8.1 in snow. However, to date, there has been few data such ratios in snow, thus it is hard to compare the variation between Arctic and urban areas. The ratios in snow are considerably higher than those in air, and could be explained by the higher volatilization potential of 6:2 FTOH and by different degradation processes of FTOHs in air and snow.

Bottom Line: A significant log-linear relationship was observed between the gas/particle partition coefficient and vapor pressure of the neutral PFASs.For fluorotelomer alcohol (FTOHs) and fluorotelomer acrylates (FTAs), the air-snow exchange fluxes were positive, indicating net evaporative from snow into air, while net deposition into snow was observed for perfluorooctane sulfonamidoethanols (Me/EtFOSEs) in winter and spring of 2012.Air-snow exchange may significantly interfere with atmospheric concentrations of neutral PFASs in the Arctic.

View Article: PubMed Central - PubMed

Affiliation: Helmholtz-Zentrum Geesthacht, Centre for Materials and Coastal Research, Institute of Coastal Research, Department for Environmental Chemistry, Geesthacht, 21502, Germany.

ABSTRACT
Levels of neutral poly-/perfluoroalkyl substances (nPFASs) in air and snow collected from Ny-Ålesund were measured and their air-snow exchange was determined to investigate whether they could re-volatilize into the atmosphere driven by means of air-snow exchange. The total concentration of 12 neutral PFASs ranged from 6.7 to 39 pg m(-3) in air and from 330 to 690 pg L(-1) in snow. A significant log-linear relationship was observed between the gas/particle partition coefficient and vapor pressure of the neutral PFASs. For fluorotelomer alcohol (FTOHs) and fluorotelomer acrylates (FTAs), the air-snow exchange fluxes were positive, indicating net evaporative from snow into air, while net deposition into snow was observed for perfluorooctane sulfonamidoethanols (Me/EtFOSEs) in winter and spring of 2012. The air-snow exchange was snow-phase controlled for FTOHs and FTAs, and controlled by the air-phase for FOSEs. Air-snow exchange may significantly interfere with atmospheric concentrations of neutral PFASs in the Arctic.

No MeSH data available.