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    Rights statement: 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

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

Research output: Contribution to journalJournal article

Published
<mark>Journal publication date</mark>18/06/2019
<mark>Journal</mark>Environmental Science and Technology
Issue number12
Volume53
Number of pages8
Pages (from-to)6757-6764
Publication statusPublished
Early online date23/05/19
Original languageEnglish

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.

Bibliographic note

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