Sorbent-Impregnated Polyurethane Foam Disk for Passive Air Sampling of Volatile Fluorinated Chemicals

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• 作者：Mahiba Shoeib ; Tom Harner ; Sum Chi Lee ; Douglas Lane ; Jiping Zhu
• 刊名：Analytical Chemistry
• 出版年：2008
• 出版时间：February 1, 2008
• 年：2008
• 卷：80
• 期：3
• 页码：675 - 682
• 全文大小：299K
• 年卷期：v.80,no.3(February 1, 2008)
• ISSN：1520-6882

文摘

A passive air sampler comprising a polyurethane foam(PUF) disk impregnated with XAD-4 powder has beendeveloped. This sorbent-impregnated PUF (SIP) diskbuilds on previous work using PUF disk passive airsamplers that have been effective in spatial air mappingstudies of nonpolar hydrophobic chemicals, without theneed of electricity or expensive air sampling equipment.In this study, PUF disks and SIP disks are calibrated forsampling volatile polyfluorinated chemicals-specifically,the fluorotelomer alcohols (FTOHs) and perfluoroalkylsulfonamides (PFASs). Results demonstrate the low sorptive capacity of the PUF disk samplers, particularly forthe FTOHs, with PUF disks reaching equilibrium within1 day, after collecting ~0.4 and 1.2 m³ of air for 8:2FTOH and 10:2 FTOH, respectively. This limits their usefor these target compounds when time-weighted, linear-phase sampling is desired. The presence of just 0.4 g ofXAD powder in the SIP disks greatly increases thesorptive capacity (by ~2 orders of magnitude for theFTOHs) and provides linear-phase sampling for a periodof several weeks. PUF-air partition coefficients, K_PUF-A,calculated for the FTOHs and PFASs are considerablylower than values predicted using previously establishedcorrelations against the octanol-air partition coefficient,K_OA, demonstrating the unique partitioning behavior ofthe polyfluorinated chemicals. Using results from thesecalibration tests, air concentrations of FTOHs were derived from PUF disk samples that were deployed in 52homes in Ottawa, Canada, during 2002/2003. Theserepresent the first comprehensive measurements of FTOHsin indoor air in North America. Range and (geometricmean) air concentrations (pg m^-3) were 261-28 900(2070) for 8:2 FTOH and 104-9210 (890) for 10:2FTOH. These air concentrations are orders of magnitudehigher than observed for outdoor air, establishing indoorenvironments as important for human exposure and alsoas potential sources to the larger environment.