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Environ Pollut

Title:		Atmospheric concentrations and trends of poly- and perfluoroalkyl substances (PFAS) and volatile methyl siloxanes (VMS) over 7 years of sampling in the Global Atmospheric Passive Sampling (GAPS) network
Author(s):		Rauert C; Shoieb M; Schuster JK; Eng A; Harner T;
Address:		"Air Quality Processes Research Section, Environment and Climate Change Canada, 4905 Dufferin St., Toronto, ON, M3H 5T4, Canada. Air Quality Processes Research Section, Environment and Climate Change Canada, 4905 Dufferin St., Toronto, ON, M3H 5T4, Canada. Electronic address: Tom.Harner@canada.ca"
Journal Title:		Environ Pollut
Year:		2018
Volume:		20180313
Issue:
Page Number:		94 - 102
DOI:		10.1016/j.envpol.2018.03.017
ISSN/ISBN:		1873-6424 (Electronic) 0269-7491 (Linking)
Abstract:		"Poly- and per-fluoroalkyl substances (PFAS) and volatile methyl siloxanes (VMS) were monitored at 21 sites in the Global Atmospheric Passive Sampling (GAPS) Network. Atmospheric concentrations previously reported from 2009 were compared to concentrations measured at these sites in 2013 and 2015, to assess trends over 7 years of monitoring. Concentrations of the fluorotelomer alcohols (FTOHs) and fluorinated sulfonamides and sulfonamidoethanols (FOSAs and FOSEs) were stable at these sites from 2009 to 2015 with no significant difference (p?ª+>?ª+0.05) in concentrations. Elevated concentrations of all the neutral PFAS were detected at the urban sites as compared to the polar/background sites. The perfluorosulfonic acids (PFSAs), meanwhile, saw a significant increase (p?ª+?ª+0.05). Concentrations of the PFSAs and the PFCAs were similar at all location types, showing the global reach of these persistent compounds. Concentrations of the cyclic VMS (cVMS) were at least an order of magnitude higher than the linear VMS (lVMS) and the PFAS. Octamethylcyclotetrasiloxane (D4), decamethylcyclopentasiloxane (D5) and dodecamethylcyclohexasiloxane (D6) saw a weak significant increase in concentrations from 2009 to 2013 (p?ª+
Keywords:		Air Pollutants/*analysis Environmental Monitoring/*methods Fluorocarbon Polymers/analysis Fluorocarbons/*analysis Siloxanes/*analysis Volatile Organic Compounds/*analysis/chemistry Atmospheric trends GAPS network Poly- and perfluoroalkyl substances Volati;
Notes:		"MedlineRauert, Cassandra Shoieb, Mahiba Schuster, Jasmin K Eng, Anita Harner, Tom eng England 2018/03/17 Environ Pollut. 2018 Jul; 238:94-102. doi: 10.1016/j.envpol.2018.03.017. Epub 2018 Mar 13"