2 research outputs found
Characterization of Two Passive Air Samplers for Per- and Polyfluoroalkyl Substances
Two passive air sampler (PAS) media
were characterized under field
conditions for the measurement of per- and polyfluoroalkyl substances
(PFASs) in the atmosphere. The PASs, consisting of polyurethane foam
(PUF) and sorbent-impregnated PUF (SIP) disks, were deployed for over
one year in parallel with high volume active air samplers (HV-AAS)
and low volume active air samplers (LV-AAS). Samples were analyzed
for perfluoroalkyl carboxylic acids (PFCAs), perfluoroalkane sulfonic
acids (PFSAs), fluorotelomer alcohols (FTOHs), fluorotelomer methacrylates
(FTMACs), fluorotelomer acrylates (FTACs), perfluorooctane sulfonamides
(FOSAs), and perfluorooctane sulfonamidoethanols (FOSEs). Sampling
rates and the passive sampler medium (PSM)-air partition coefficient
(<i>K</i><sub>PSM–A</sub>) were calculated for individual
PFASs. Sampling rates were similar for PFASs present in the gas phase
and particle phase, and the linear sampling rate of 4 m<sup>–3</sup> d<sup>–1</sup> is recommended for calculating effective air
sample volumes in the SIP-PAS and PUF-PAS for PFASs except for the
FOSAs and FOSEs in the PUF-PAS. SIP disks showed very good performance
for all tested PFASs while PUF disks were suitable only for the PFSAs
and their precursors. Experiments evaluating the suitability of different
isotopically labeled fluorinated depuration compounds (DCs) revealed
that <sup>13</sup>C<sub>8</sub>-perfluorooctanoic acid (PFOA) was
suitable for the calculation of site-specific sampling rates. Ambient
temperature was the dominant factor influencing the seasonal trend
of PFASs