Mechanistic Insight into the Uptake and Fate of Persistent Organic Pollutants in Sea Ice

Garnett, Jack and Halsall, Crispin and Thomas, Max and France, James and Kaiser, Jan and Graf, Carola and Leeson, Amber and Wynn, Peter (2019) Mechanistic Insight into the Uptake and Fate of Persistent Organic Pollutants in Sea Ice. Environmental Science and Technology, 53 (12). pp. 6757-6764. ISSN 0013-936X

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Abstract

The fate of persistent organic pollutants in sea ice is a poorly researched area and yet ice serves as an important habitat for organisms at the base of the marine foodweb. This study presents laboratory-controlled experiments to investigate the mechanisms governing the fate of organic contaminants in sea ice grown from artificial seawater. Sea ice formation was shown to result in the entrainment of chemicals from seawater, and concentration profiles in bulk ice generally showed the highest levels in both the upper (ice-atmosphere interface) and lower (ice-ocean interface) ice layers, suggesting their incorporation and distribution is influenced by brine advection. Results from a 1-D sea ice brine dynamics model supported this, but also indicated that other processes may be needed to accurately model low-polarity compounds in sea ice. This was reinforced by results from a melt experiment, which not only showed chemicals were more enriched in saltier brine, but also revealed that chemicals are released from sea ice at variable rates. We use our results to demonstrate the importance of processes related to the occurrence and movement of brine for controlling chemical fate in sea ice which provides a pathway for exposure to ice-associated biota at the base of the pelagic food web.

Item Type: Journal Article
Journal or Publication Title: Environmental Science and Technology
Additional Information: This document is the Accepted Manuscript version of a Published Work that appeared in final form inEnvironmental Science and Technology, copyright ©2019 American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://pubs.acs.org/doi/10.1021/acs.est.9b00967
Uncontrolled Keywords: /dk/atira/pure/subjectarea/asjc/2300/2304
Subjects:
Departments: Faculty of Science and Technology > Lancaster Environment Centre
ID Code: 135125
Deposited By: ep_importer_pure
Deposited On: 17 Jul 2019 13:15
Refereed?: Yes
Published?: Published
Last Modified: 24 Feb 2020 03:56
URI: https://eprints.lancs.ac.uk/id/eprint/135125

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