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Environ Sci Technol

Title:		Cyclic volatile methylsiloxane bioaccumulation in flounder and ragworm in the Humber Estuary
Author(s):		Kierkegaard A; van Egmond R; McLachlan MS;
Address:		"Department of Applied Environmental Science (ITM), Stockholm University, SE-106 91 Stockholm, Sweden. amelie.kierkegaard@itm.su.se"
Journal Title:		Environ Sci Technol
Year:		2011
Volume:		20110628
Issue:		14
Page Number:		5936 - 5942
DOI:		10.1021/es200707r
ISSN/ISBN:		1520-5851 (Electronic) 0013-936X (Linking)
Abstract:		"Cyclic volatile methylsiloxanes are being subjected to regulatory scrutiny as possible PBT chemicals. The investigation of bioaccumulation has yielded apparently contradictory results, with high laboratory fish bioconcentration factors on the one hand and low field trophic magnification factors on the other. In this study, octamethylcyclotetrasiloxane (D4), decamethylcyclopentasiloxane (D5), and dodecamethylcyclohexasiloxane (D6) were studied along with polychlorinated biphenyls (PCBs) in sediments, ragworm, and flounder from six sites in the Humber Estuary. Bioaccumulation was evaluated using multimedia bioaccumulation factors (mmBAFs) which quantified the fraction of the contaminant present in the aquatic environment that is transferred to the biota. PCB 180, a known strongly bioaccumulative chemical, was used as a benchmark. The mean mmBAF of D5 was about twice that of PCB 180 in both polycheates and flounder, while for D4 it was 6 and 14 times higher, respectively. The mmBAF of D6 was a factor 5-10 lower than that of PCB180. The comparatively strong multimedia bioaccumulation of D4 and D5, even in the absence of biomagnification, was explained by both compounds having a >100 times stronger tendency to partition into lipid rather than into organic carbon, while PCB 180 partitions to a similar extent into both matrices"
Keywords:		"Animals England Environmental Monitoring/*statistics & numerical data Flounder/*metabolism Gas Chromatography-Mass Spectrometry Geologic Sediments/*chemistry Hydrocarbons, Cyclic/analysis/*pharmacokinetics Polychaeta/*metabolism Rivers Seawater Siloxanes/;"
Notes:		"MedlineKierkegaard, Amelie van Egmond, Roger McLachlan, Michael S eng Research Support, Non-U.S. Gov't 2011/06/15 Environ Sci Technol. 2011 Jul 15; 45(14):5936-42. doi: 10.1021/es200707r. Epub 2011 Jun 28"