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Environ Sci Technol

Title:		Global distribution of linear and cyclic volatile methyl siloxanes in air
Author(s):		Genualdi S; Harner T; Cheng Y; MacLeod M; Hansen KM; van Egmond R; Shoeib M; Lee SC;
Address:		"Environment Canada , Science and Technology Branch, 4905 Dufferin Street, Toronto, ON M3H 5T4, Canada"
Journal Title:		Environ Sci Technol
Year:		2011
Volume:		20110325
Issue:		8
Page Number:		3349 - 3354
DOI:		10.1021/es200301j
ISSN/ISBN:		1520-5851 (Electronic) 0013-936X (Linking)
Abstract:		"The global distribution of linear and cyclic volatile methyl silxoanes (VMS) was investigated at 20 sites worldwide, including 5 locations in the Arctic, using sorbent-impregnated polyurethane foam (SIP) disk passive air samplers. Cyclic VMS are currently being considered for regulation because they are high production volume chemicals that are potentially persistent, bioaccumulative, and toxic. Linear and cyclic VMS (including L3, L4, L5, D3, D4, D5, and D6) were analyzed for in air at all urban, background, and Arctic sites. Concentrations of D3 and D4 are significantly correlated, as are D5 and D6, which suggests different sources for these two pairs of compounds. Elevated concentrations of D3 and D4 on the West coast of North America and at high elevation sites suggest these sites are influenced by trans-Pacific transport, while D5 and D6 have elevated concentrations in urban areas, which is most likely due to personal care product use. Measured concentrations of D5 were compared to modeled concentrations generated using both the Danish Eulerian Hemispheric Model (DEHM) and the Berkeley-Trent Global Contaminant Fate Model (BETR Global). The correlation coefficients (r) between the measured and modeled results were 0.73 and 0.58 for the DEHM and BETR models, respectively. Agreement between measurements and models indicate that the sources, transport pathways, and sinks of D5 in the global atmosphere are fairly well understood"
Keywords:		"Air Pollutants/*analysis/chemistry Air Pollution/statistics & numerical data Atmosphere/chemistry Environmental Monitoring Models, Chemical Siloxanes/*analysis/chemistry Volatile Organic Compounds/*analysis/chemistry;"
Notes:		"MedlineGenualdi, Susie Harner, Tom Cheng, Yu Macleod, Matthew Hansen, Kaj M van Egmond, Roger Shoeib, Mahiba Lee, Sum Chi eng Research Support, Non-U.S. Gov't 2011/03/29 Environ Sci Technol. 2011 Apr 15; 45(8):3349-54. doi: 10.1021/es200301j. Epub 2011 Mar 25"