Assessing the ecological impacts of NORM-contaminated scale on marine infauna using sediment microcosms

Amy MacIntosh, Katherine Dafforn, Beth Penrose, Anthony Chariton, Tom Cresswell

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1 Citation (Scopus)
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Naturally occurring radioactive materials (NORMs) can be found in decommissioned oil and gas infrastructure (e.g. pipelines), including scales. The effects of NORM contaminants from offshore infrastructure on benthic macroorganisms remain poorly understood. To test the potential ecological effects of NORM-contaminated scale, we exposed a marine amphipod, a clam and a polychaete to marine sediments spiked with low level concentrations of barium sulfate scale retrieved from a decommissioned subsea pipe. Only amphipods were included in further analysis due to treatment mortalities of the clam and polychaete. Barium (Ba) and copper (Cu) were elevated in the seawater overlying the spiked sediments, although no sediment metals exceeded guidelines. 210Po was the only NORM detected in the overlying waters while both 210Po and 226Ra were significantly elevated in the scale-contaminated sediments when compared with the control sediments. The whole-body burden of Ba and 226Ra were significantly higher in the scale-exposed amphipods. Using experiment- and scale-specific parameters in biota dose assessments suggested potential dose rates may elicit individual and population level effects. Future work is needed to assess the biological impacts and effects of NORM scale at elevated levels above background concentrations and the accumulation of NORM-associated contaminants by marine organisms.

Original languageEnglish
Article number139939
Pages (from-to)1-15
Number of pages15
Publication statusPublished - Nov 2023

Bibliographical note

Funding Information:
This study was partially supported by an undisclosed industry partner as part of a long-term collaborative project between the Australian Nuclear Science and Technology Organization ( ANSTO ) and Macquarie University (Project ID 113793469 : Developing an ecological framework for closure of offshore petroleum structures). This work was supported by an Australian Government Research Training Program scholarship and a New South Wales (NSW) FutureNow Scholarship to A.M.

Publisher Copyright:
© 2023 The Authors


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