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Elucidating the Behavior of Cyclic Volatile Methylsiloxanes in a Subarctic Freshwater Food Web: A Modeled and Measured Approach.

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posted on 28.03.2018, 09:16 by Ingjerd S. Krogseth, Emma Undeman, Anita Evenset, Guttorm N. Christensen, Mick J. Whelan, Knut Breivik, Nicholas A. Warner
Cyclic volatile methylsiloxanes (cVMS) are used in personal care products and emitted to aquatic environments through wastewater effluents, and their bioaccumulation potential is debated. Here, a new bentho-pelagic version of the ACC-HUMAN model was evaluated for polychlorinated biphenyls (PCBs) and applied to cVMS in combination with measurements to explore their bioaccumulation behavior in a subarctic lake. Predictions agreed better with measured PCB concentrations in Arctic char (Salvelinus alpinus) and brown trout (Salmo trutta) when the benthic link was included than in the pelagic-only model. Measured concentrations of decamethylcyclopentasiloxane (D5) were 60 ± 1.2 (Chironomidae larvae), 107 ± 4.5 (pea clams Pisidium sp.), 131 ± 105 (three-spined sticklebacks: Gasterosteus aculeatus), 41 ± 38 (char), and 9.9 ± 5.9 (trout) ng g-1wet weight. Concentrations were lower for octamethylcyclotetrasiloxane (D4) and dodecamethylcyclohexasiloxane (D6), and none of the cVMS displayed trophic magnification. Predicted cVMS concentrations were lower than measured in benthos, but agreed well with measurements in fish. cVMS removal through ventilation was an important predicted loss mechanism for the benthic-feeding fish. Predictions were highly sensitive to the partition coefficient between organic carbon and water (KOC) and its temperature dependence, as this controlled bioavailability for benthos (the main source of cVMS for fish).

Funding

We are grateful to the Research Council of Norway (project numbers 222259 and 244298) and the FRAM Flagship Hazardous substances–effects on ecosystems and human health for financing the study, and to Hammerfest municipality, local fishermen, and Line Christoffersen for assistance. E.U. also acknowledges funding through the Baltic Sea Adaptive Management (BEAM) project at Stockholm University.

History

Citation

Environmental Science and Technology, 2017, 51 (21), pp. 12489-12497

Author affiliation

/Organisation/COLLEGE OF SCIENCE AND ENGINEERING/School of Geography, Geology and the Environment/Physical Geography

Version

VoR (Version of Record)

Published in

Environmental Science and Technology

Publisher

American Chemical Society

issn

0013-936X

eissn

1520-5851

Acceptance date

05/10/2017

Copyright date

2017

Available date

28/03/2018

Publisher version

https://pubs.acs.org/doi/10.1021/acs.est.7b03083

Notes

The Supporting Information is available free of charge on the ACS Publications website at DOI: 10.1021/acs.est.7b03083.

Language

en

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