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REVIEW (Open Access)

A review of the potential risks associated with mercury in subsea oil and gas pipelines in Australia

Francesca Gissi https://orcid.org/0000-0002-4622-7572 A * , Darren Koppel https://orcid.org/0000-0001-7534-237X B C , Alexandra Boyd A , Fenny Kho https://orcid.org/0000-0001-5443-2720 C , Rebecca von Hellfeld https://orcid.org/0000-0003-4283-7813 D E , Stuart Higgins C , Simon Apte F and Tom Cresswell https://orcid.org/0000-0002-5320-7553 A
+ Author Affiliations
- Author Affiliations

A Australian Nuclear Science and Technology Organisation, Lucas Heights, NSW 2234, Australia.

B Australian Institute of Marine Science, Crawley, WA 6009, Australia.

C Curtin University Oil and Gas Innovation Centre, Faculty of Science and Engineering, Perth, WA 6009, Australia.

D National Decommissioning Centre, Newburgh, Ellon AB41 6AA, UK.

E School of Biological Sciences, University of Aberdeen, AB24 3UL, Aberdeen, UK.

F Commonwealth Scientific Industrial Research Organisation Land and Water, Lucas Heights, NSW 2234, Australia.

* Correspondence to: Francesca.gissi@ansto.gov.au

Handling Editor: Kevin Wilkinson

Environmental Chemistry 19(4) 210-227 https://doi.org/10.1071/EN22048
Submitted: 5 May 2022  Accepted: 17 August 2022   Published: 1 November 2022

© 2022 The Author(s) (or their employer(s)). Published by CSIRO Publishing. This is an open access article distributed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND)

Environmental context. The oil and gas industry has a significant liability in decommissioning offshore infrastructure. Following decommissioning, subsea pipelines could be left on the seabed to provide artificial reefs. Mercury is a contaminant of concern which could remain within pipelines. There are gaps in our knowledge on how mercury moves through the marine environment. We review the current science and identify future research needs to understand potential impacts from mercury in subsea pipelines which will better inform decommissioning activities globally.

Abstract. In the coming years, the oil and gas industry will have a significant liability in decommissioning offshore infrastructure such as subsea pipelines. The policies around decommissioning vary depending on regional policies and laws. In Australia, the ‘base case’ for decommissioning is removal of all property and the plugging and abandonment of wells in line with the Offshore Petroleum and Greenhouse Gas Storage (OPGGS) Act 2006. Options other than complete removal may be considered where the titleholder can demonstrate that the alternative decommissioning activity delivers equal or better environmental outcomes compared to complete removal and meets all requirements under the OPGGS Act and regulations. Recent research has demonstrated that decommissioning in situ can have significant environmental benefits by forming artificial reefs, increasing marine biodiversity, and providing a potential fishery location. An issue, which has been given less attention, is around contaminants remaining within decommissioned infrastructure and their potential risks to the marine environment. Mercury is a contaminant of concern known to be present in some oil and gas pipelines, but the potential long-term impacts on marine ecosystems are poorly understood. We present a synthesis of information on mercury cycling in the marine environment including key drivers of methylation in sediments and ocean waters, existing models to predict methylmercury concentrations in sediments, and toxicological effects to marine biota. We discuss the applicability of existing water and sediment quality guidelines, and the associated risk assessment frameworks to decommissioning offshore infrastructure contaminated with mercury. Globally, research is needed to provide a comprehensive risk assessment framework for offshore infrastructure decommissioning. We recommend future areas of research to improve our understanding of the potential risks associated with mercury in subsea oil and gas pipelines.

Keywords: decommissionineg, marine, methylmercury, offshore infrastructure, petroleum, risk assessment, sediments, toxicity.


References

AECOM (2016) Appendix A: Water Quality Study. Available at https://www.nopsema.gov.au/sites/default/files/documents/2021-04/A737169.pdf [accessed 1 November 2021]

Amos HM, Jacob DJ, Kocman D, Horowitz HM, Zhang Y, Dutkiewicz S, Horvat M, Corbitt ES, Krabbenhoft DP, Sunderland EM (2014). Global biogeochemical implications of mercury discharges from rivers and sediment burial. Environmental Science & Technology 48, 9514–9522.
Global biogeochemical implications of mercury discharges from rivers and sediment burial.Crossref | GoogleScholarGoogle Scholar |

An J, Zhang L, Lu X, Pelletier DA, Pierce EM, Johs A, Parks JM, Gu B (2019). Mercury uptake by Desulfovibrio desulfuricans ND132: passive or active?. Environmental Science & Technology 53, 6264–6272.
Mercury uptake by Desulfovibrio desulfuricans ND132: passive or active?.Crossref | GoogleScholarGoogle Scholar |

ANZG (2018) Australian and New Zealand Guidelines for Fresh and Marine Water Quality. Canberra ACT, Australia. Available at www.waterquality.gov.au/anz-guidelines [accessed 1 October 2021]

Bakke T, Klungsøyr J, Sanni S (2013). Environmental impacts of produced water and drilling waste discharges from the Norwegian offshore petroleum industry. Marine Environmental Research 92, 154–169.
Environmental impacts of produced water and drilling waste discharges from the Norwegian offshore petroleum industry.Crossref | GoogleScholarGoogle Scholar |

Balogh SJ, Tsui MT-K, Blum JD, Matsuyama A, Woerndle GE, Yano S, Tada A (2015). Tracking the fate of mercury in the fish and bottom sediments of Minamata Bay, Japan, using stable mercury isotopes. Environ Sci Technol 49, 5399–406.
Tracking the fate of mercury in the fish and bottom sediments of Minamata Bay, Japan, using stable mercury isotopes.Crossref | GoogleScholarGoogle Scholar |

Bank MS (2020). The mercury science-policy interface: History, evolution and progress of the Minamata Convention. Science of The Total Environment 722, 137832
The mercury science-policy interface: History, evolution and progress of the Minamata Convention.Crossref | GoogleScholarGoogle Scholar |

Beldowski J, Miotk M, Pempkowiak J (2015). Methylation index as means of quantification of the compliance of sedimentary mercury to be methylated. Environmental Monitoring and Assessment 187, 498
Methylation index as means of quantification of the compliance of sedimentary mercury to be methylated.Crossref | GoogleScholarGoogle Scholar |

Benoit JM, Gilmour CC, Mason RP, Heyes A (1999). Sulfide controls on mercury speciation and bioavailability to methylating bacteria in sediment pore waters. Environmental Science & Technology 33, 951–957.
Sulfide controls on mercury speciation and bioavailability to methylating bacteria in sediment pore waters.Crossref | GoogleScholarGoogle Scholar |

Black FJ, Conaway CH, Flegal AR (2009). Stability of dimethyl mercury in seawater and its conversion to monomethyl mercury. Environmental Science & Technology 43, 4056–4062.
Stability of dimethyl mercury in seawater and its conversion to monomethyl mercury.Crossref | GoogleScholarGoogle Scholar |

Bloom NS (1992). On the chemical form of mercury in edible fish and marine invertebrate tissue. Canadian Journal of Fisheries and Aquatic Sciences 49, 1010–1017.
On the chemical form of mercury in edible fish and marine invertebrate tissue.Crossref | GoogleScholarGoogle Scholar |

Bond T, Langlois TJ, Partridge JC, Birt MJ, Malseed BE, Smith L, Mclean DL (2018). Diel shifts and habitat associations of fish assemblages on a subsea pipeline. Fisheries Research 206, 220–234.
Diel shifts and habitat associations of fish assemblages on a subsea pipeline.Crossref | GoogleScholarGoogle Scholar |

Bowman KL, Lamborg CH, Agather AM (2020). A global perspective on mercury cycling in the ocean. Science of The Total Environment 710, 136166
A global perspective on mercury cycling in the ocean.Crossref | GoogleScholarGoogle Scholar |

Bull AS, Love MS (2019). Worldwide oil and gas platform decommissioning: a review of practices and reefing options. Ocean & Coastal Management 168, 274–306.
Worldwide oil and gas platform decommissioning: a review of practices and reefing options.Crossref | GoogleScholarGoogle Scholar |

Chen Y, Dong W (2021). Predicted near-future oceanic warming enhances mercury toxicity in marine copepods. Bulletin of Environmental Contamination and Toxicology 108, 824–829.
Predicted near-future oceanic warming enhances mercury toxicity in marine copepods.Crossref | GoogleScholarGoogle Scholar |

Chen L, Li Y (2019). A review on the distribution and cycling of mercury in the Pacific Ocean. Bulletin of Environmental Contamination and Toxicology 102, 665–671.
A review on the distribution and cycling of mercury in the Pacific Ocean.Crossref | GoogleScholarGoogle Scholar |

Chen C, Amirbahman A, Fisher N, Harding G, Lamborg C, Nacci D, Taylor D (2008). Methylmercury in marine ecosystems: spatial patterns and processes of production, bioaccumulation, and biomagnification. EcoHealth 5, 399–408.
Methylmercury in marine ecosystems: spatial patterns and processes of production, bioaccumulation, and biomagnification.Crossref | GoogleScholarGoogle Scholar |

Compeau GC, Bartha R (1985). Sulfate-reducing bacteria: principal methylators of mercury in anoxic estuarine sediment. Applied and Environmental Microbiology 50, 498–502.
Sulfate-reducing bacteria: principal methylators of mercury in anoxic estuarine sediment.Crossref | GoogleScholarGoogle Scholar |

Conaway CH, Squire S, Mason RP, Flegal AR (2003). Mercury speciation in the San Francisco Bay estuary. Marine Chemistry 80, 199–225.
Mercury speciation in the San Francisco Bay estuary.Crossref | GoogleScholarGoogle Scholar |

Conder JM, Fuchsman PC, Grover MM, Magar VS, Henning MH (2015). Critical review of mercury sediment quality values for the protection of benthic invertebrates. Environmental Toxicology and Chemistry 34, 6–21.
Critical review of mercury sediment quality values for the protection of benthic invertebrates.Crossref | GoogleScholarGoogle Scholar |

ConocoPhillips (2019) Barossa Area Development. Offshore Project Proposal. Appendices. Available at https://docs.nopsema.gov.au/A598152 [accessed 1 November 2021]

Cossa D, Averty B, Pirrone N (2009). The origin of methylmercury in open Mediterranean waters. Limnology and Oceanography 54, 837–844.
The origin of methylmercury in open Mediterranean waters.Crossref | GoogleScholarGoogle Scholar |

Cossa D, Heimbürger L-E, Lannuzel D, Rintoul SR, Butler ECV, Bowie AR, Averty B, Watson RJ, Remenyi T (2011). Mercury in the Southern Ocean. Geochimica et Cosmochimica Acta 75, 4037–4052.
Mercury in the Southern Ocean.Crossref | GoogleScholarGoogle Scholar |

Cossa D, Garnier C, Buscail R, Elbaz-Poulichet F, Mikac N, Patel-Sorrentino N, Tessier E, Rigaud S, Lenoble V, Gobeil C (2014). A Michaelis–Menten type equation for describing methylmercury dependence on inorganic mercury in aquatic sediments. Biogeochemistry 119, 35–43.
A Michaelis–Menten type equation for describing methylmercury dependence on inorganic mercury in aquatic sediments.Crossref | GoogleScholarGoogle Scholar |

Craig PJ (1986) ‘Organometallic Compounds in the Environment: Principles and Reactions.’ (Wiley: New York, NY, USA)

Dai SS, Yang Z, Tong Y, Chen L, Liu SY, Pan R, Li Y, Zhang CJ, Liu YR, Huang Q (2021). Global distribution and environmental drivers of methylmercury production in sediments. Journal of Hazardous Materials 407, 124700
Global distribution and environmental drivers of methylmercury production in sediments.Crossref | GoogleScholarGoogle Scholar |

DAWE (2021) EPBC Act Protected Matters Report. Available at https://docs.nopsema.gov.au/A800772 [accessed 1 November 2021]

DEC (2006) Background quality of the marine sediments of the Pilbara coast. Marine Technical Report Series. Available at https://www.epa.wa.gov.au/sites/default/files/Policies_and_Guidance/MTR1_Pilbara%20Coast_29Sept06.pdf [accessed 1 November 2021]

DISER (2022) ‘Department of Industry, Science, Energy and Resources. Guideline: Offshore petroleum decommissioning.’ (Australian Government: Canberra, ACT) Available at https://www.nopta.gov.au/_documents/guidelines/Offshore-Petroleum-Decommissioning-guideline.pdf [accessed 1 April 2022]

Drott A, Lambertsson L, Björn E, Skyllberg U (2008). Do potential methylation rates reflect accumulated methyl mercury in contaminated sediments. Environmental Science & Technology 42, 153–158.
Do potential methylation rates reflect accumulated methyl mercury in contaminated sediments.Crossref | GoogleScholarGoogle Scholar |

European Commission (EC) (2006) Setting Maximum Levels for Certain Contaminants in Foodstuffs. Commission Regulation (EC) No 1881/2006. Available at https://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=OJ:L:2006:364:0005:0024:EN:PDF [accessed 1 October 2021]​

Fam ML, Konovessis D, Ong LS, Tan HK (2018). A review of offshore decommissioning regulations in five countries – strengths and weaknesses. Ocean Engineering 160, 244–263.
A review of offshore decommissioning regulations in five countries – strengths and weaknesses.Crossref | GoogleScholarGoogle Scholar |

Fitzgerald WF, Lamborg CH, Hammerschmidt CR (2007). Marine biogeochemical cycling of mercury. Chemical Reviews 107, 641–662.
Marine biogeochemical cycling of mercury.Crossref | GoogleScholarGoogle Scholar |

Fowler AM, Jørgensen AM, Svendsen JC, Macreadie PI, Jones DOB, Boon AR, Booth DJ, Brabant R, Callahan E, Claisse JT, Dahlgren TG, Degraer S, Dokken QR, Gill AB, Johns DG, Leewis RJ, Lindeboom HJ, Linden O, May R, Murk AJ, Ottersen G, Schroeder DM, Shastri SM, Teilmann J, Todd V, Van Hoey G, Vanaverbeke J, Coolen JWP (2018). Environmental benefits of leaving offshore infrastructure in the ocean. Frontiers in Ecology and the Environment 16, 571–578.
Environmental benefits of leaving offshore infrastructure in the ocean.Crossref | GoogleScholarGoogle Scholar |

FSANZ (2017) Australia and New Zealand Food Standards Code - Schedule 19 - Maximum levels of contaminants and natural toxicants. Commonwealth of Australia, Canberra. Available at https://www.legislation.gov.au/Details/F2017C00333 [accessed 1 October 2021].

Ganguli PM, Conaway CH, Swarzenski PW, Izbicki JA, Flegal AR (2012). Mercury speciation and transport via submarine groundwater discharge at a Southern California Coastal Lagoon System. Environmental Science & Technology 46, 1480–1488.
Mercury speciation and transport via submarine groundwater discharge at a Southern California Coastal Lagoon System.Crossref | GoogleScholarGoogle Scholar |

Gilmour CC, Bullock AL, Mcburney A, Podar M, Elias DA (2018). Robust mercury methylation across diverse methanogenic Archaea. mBio 9, e02403-17
Robust mercury methylation across diverse methanogenic Archaea.Crossref | GoogleScholarGoogle Scholar |

Graham AM, Aiken GR, Gilmour CC (2013). Effect of dissolved organic matter source and character on microbial Hg methylation in Hg–S–DOM solutions. Environmental Science & Technology 47, 5746–5754.
Effect of dissolved organic matter source and character on microbial Hg methylation in Hg–S–DOM solutions.Crossref | GoogleScholarGoogle Scholar |

Gworek B, Bemowska-Kałabun O, Kijeńska M, Wrzosek-Jakubowska J (2016). Mercury in marine and oceanic waters—a review. Water, Air, & Soil Pollution 227, 371
Mercury in marine and oceanic waters—a review.Crossref | GoogleScholarGoogle Scholar |

Hammerschmidt CR, Bowman KL (2012). Vertical methylmercury distribution in the subtropical North Pacific Ocean. Marine Chemistry 132–133, 77–82.
Vertical methylmercury distribution in the subtropical North Pacific Ocean.Crossref | GoogleScholarGoogle Scholar |

Harayashiki CAY, Reichelt-Brushett AJ, Liu L, Butcher P (2016). Behavioural and biochemical alterations in Penaeus monodon post-larvae diet-exposed to inorganic mercury. Chemosphere 164, 241–247.
Behavioural and biochemical alterations in Penaeus monodon post-larvae diet-exposed to inorganic mercury.Crossref | GoogleScholarGoogle Scholar |

Heimbürger L-E, Cossa D, Marty J-C, Migon C, Averty B, Dufour A, Ras J (2010). Methyl mercury distributions in relation to the presence of nano- and picophytoplankton in an oceanic water column (Ligurian Sea, North-western Mediterranean. Geochimica et Cosmochimica Acta 74, 5549–5559.
Methyl mercury distributions in relation to the presence of nano- and picophytoplankton in an oceanic water column (Ligurian Sea, North-western Mediterranean.Crossref | GoogleScholarGoogle Scholar |

Heyes A, Mason RP, Kim EH, Sunderland E (2006). Mercury methylation in estuaries: insights from using measuring rates using stable mercury isotopes. Marine Chemistry 102, 134–147.
Mercury methylation in estuaries: insights from using measuring rates using stable mercury isotopes.Crossref | GoogleScholarGoogle Scholar |

Hintelmann H, Keppel-Jones K, Evans RD (2000). Constants of mercury methylation and demethylation rates in sediments and comparison of tracer and ambient mercury availability. Environmental Toxicology and Chemistry 19, 2204–2211.
Constants of mercury methylation and demethylation rates in sediments and comparison of tracer and ambient mercury availability.Crossref | GoogleScholarGoogle Scholar |

Jay JA, Morel FMM, Hemond HF (2000). Mercury speciation in the presence of polysulfides. Environmental Science & Technology 34, 2196–2200.
Mercury speciation in the presence of polysulfides.Crossref | GoogleScholarGoogle Scholar |

Jonsson S, Skyllberg U, Nilsson MB, Westlund PO, Shchukarev A, Lundberg E, Björn E (2012). Mercury methylation rates for geochemically relevant HgII species in sediments. Environmental Science & Technology 46, 11653–11659.
Mercury methylation rates for geochemically relevant HgII species in sediments.Crossref | GoogleScholarGoogle Scholar |

Jonsson S, Skyllberg U, Nilsson MB, Lundberg E, Andersson A, Björn E (2014). Differentiated availability of geochemical mercury pools controls methylmercury levels in estuarine sediment and biota. Nature Communications 5, 4624
Differentiated availability of geochemical mercury pools controls methylmercury levels in estuarine sediment and biota.Crossref | GoogleScholarGoogle Scholar |

Kerin EJ, Gilmour CC, Roden E, Suzuki MT, Coates JD, Mason RP (2006). Mercury methylation by dissimilatory iron-reducing bacteria. Applied and Environmental Microbiology 72, 7919–7921.
Mercury methylation by dissimilatory iron-reducing bacteria.Crossref | GoogleScholarGoogle Scholar |

Khan MI, Islam MR (2007) Chapter 9 - Decommissioning of drilling and production facilities. In ‘The Petroleum Engineering Handbook: Sustainable Operations’. (Eds Khan MI, Islam MR) (Gulf Publishing Company)

Kho F, Koppel DJ, Von Hellfeld R, Hastings A, Gissi F, Cresswell T, Higgins S (2022). Current understanding of the ecological risk of mercury from subsea oil and gas infrastructure to marine ecosystems. Journal of Hazardous Materials 438, 129348
Current understanding of the ecological risk of mercury from subsea oil and gas infrastructure to marine ecosystems.Crossref | GoogleScholarGoogle Scholar |

Koppel DJ, Kho F, Hastings A, Crouch D, Macintosh A, Cresswell T, Higgins S (2022). Current understanding and research needs for ecological risk assessments of naturally occurring radioactive materials (NORM) in subsea oil and gas pipelines. Journal of Environmental Radioactivity 241, 106774
Current understanding and research needs for ecological risk assessments of naturally occurring radioactive materials (NORM) in subsea oil and gas pipelines.Crossref | GoogleScholarGoogle Scholar |

Krabbenhoft DP, Wiener JG, Brumbaugh WG, Olson ML, Dewild JF, Sabin TJ (1999) A national pilot study of mercury contamination of aquatic ecosystems along multiple gradients. US geological survey toxic substances hydrology program. In ‘Proceedings of the Technical Meeting, Charleston, South Carolina’. pp. 147–160. (United States Geological Survey: Washington, DC, USA)

Kucharzyk KH, Deshusses MA, Porter KA, Hsu-Kim H (2015). Relative contributions of mercury bioavailability and microbial growth rate on net methylmercury production by anaerobic mixed cultures. Environmental Science: Processes & Impacts 17, 1568–1577.
Relative contributions of mercury bioavailability and microbial growth rate on net methylmercury production by anaerobic mixed cultures.Crossref | GoogleScholarGoogle Scholar |

Kvangarsnes K, Frantzen S, Julshamn K, Sæthre LJ, Nedreaas K, Maage A (2012). Distribution of mercury in a gadoid fish species, tusk (Brosme brosme), and its implication for food safety. Journal of Food Science and Engineering 2, 603–615.
Distribution of mercury in a gadoid fish species, tusk (Brosme brosme), and its implication for food safety.Crossref | GoogleScholarGoogle Scholar |

Lamborg CH, Von Damm KL, Fitzgerald WF, Hammerschmidt CR, Zierenberg R (2006). Mercury and monomethylmercury in fluids from Sea Cliff submarine hydrothermal field, Gorda Ridge. Geophysical Research Letters 33, L17606
Mercury and monomethylmercury in fluids from Sea Cliff submarine hydrothermal field, Gorda Ridge.Crossref | GoogleScholarGoogle Scholar |

Lee YH, Kang H-M, Kim D-H, Wang M, Jeong C-B, Lee J-S (2017). Adverse effects of methylmercury (MeHg) on life parameters, antioxidant systems, and MAPK signaling pathways in the copepod Tigriopus japonicus. Aquatic Toxicology 184, 133–141.
Adverse effects of methylmercury (MeHg) on life parameters, antioxidant systems, and MAPK signaling pathways in the copepod Tigriopus japonicus.Crossref | GoogleScholarGoogle Scholar |

Lehnherr I, St. Louis VL, Hintelmann H, Kirk JL (2011). Methylation of inorganic mercury in polar marine waters. Nature Geoscience 4, 298–302.
Methylation of inorganic mercury in polar marine waters.Crossref | GoogleScholarGoogle Scholar |

Lei P, Zou N, Liu Y, Cai W, Wu M, Tang W, Zhong H (2022). Understanding the risks of mercury sulfide nanoparticles in the environment: formation, presence, and environmental behaviors. Journal of Environmental Sciences 119, 78–92.
Understanding the risks of mercury sulfide nanoparticles in the environment: formation, presence, and environmental behaviors.Crossref | GoogleScholarGoogle Scholar |

Li YB, Cai Y (2013). Progress in the study of mercury methylation and demethylation in aquatic environments. Chinese Science Bulletin Science 58, 177–185.
Progress in the study of mercury methylation and demethylation in aquatic environments.Crossref | GoogleScholarGoogle Scholar |

Li C, Sonke JE, Le Roux G, Piotrowska N, Van Der Putten N, Roberts SJ, Daley T, Rice E, Gehrels R, Enrico M, Mauquoy D, Roland TP, De Vleeschouwer F (2020). Unequal anthropogenic enrichment of mercury in Earth’s northern and southern hemispheres. ACS Earth and Space Chemistry 4, 2073–2081.
Unequal anthropogenic enrichment of mercury in Earth’s northern and southern hemispheres.Crossref | GoogleScholarGoogle Scholar |

Li Y, Li D, Song B, Li Y (2022). The potential of mercury methylation and demethylation by 15 species of marine microalgae. Water Research 215, 118266
The potential of mercury methylation and demethylation by 15 species of marine microalgae.Crossref | GoogleScholarGoogle Scholar |

Liem-Nguyen V, Jonsson S, Skyllberg U, Nilsson MB, Andersson A, Lundberg E, Björn E (2016). Effects of nutrient loading and mercury chemical speciation on the formation and degradation of methylmercury in estuarine sediment. Environmental Science & Technology 50, 6983–6990.
Effects of nutrient loading and mercury chemical speciation on the formation and degradation of methylmercury in estuarine sediment.Crossref | GoogleScholarGoogle Scholar |

Lin H, Ascher DB, Myung Y, Lamborg CH, Hallam SJ, Gionfriddo CM, Holt KE, Moreau JW (2021). Mercury methylation by metabolically versatile and cosmopolitan marine bacteria. The ISME Journal 15, 1810–1825.
Mercury methylation by metabolically versatile and cosmopolitan marine bacteria.Crossref | GoogleScholarGoogle Scholar |

Liu B, Schaider LA, Mason RP, Shine JP, Rabalais NN, Senn DB (2015). Controls on methylmercury accumulation in northern Gulf of Mexico sediments. Estuarine, Coastal and Shelf Science 159, 50–59.
Controls on methylmercury accumulation in northern Gulf of Mexico sediments.Crossref | GoogleScholarGoogle Scholar |

Long ER, Macdonald DD, Smith SL, Calder FD (1995). Incidence of adverse biological effects within ranges of chemical concentrations in marine and estuarine sediments. Environmental Management 19, 81–97.
Incidence of adverse biological effects within ranges of chemical concentrations in marine and estuarine sediments.Crossref | GoogleScholarGoogle Scholar |

Luoma SN, Rainbow PS (2008) ‘Metal Contamination in Aquatic Environments: Science and Lateral Management.’ (Cambridge University Press: Cambridge)

Macintosh A, Dafforn K, Penrose B, Chariton A, Cresswell T (2021). Ecotoxicological effects of decommissioning offshore petroleum infrastructure: a systematic review. Critical Reviews in Environmental Science and Technology 52, 3283–3321.
Ecotoxicological effects of decommissioning offshore petroleum infrastructure: a systematic review.Crossref | GoogleScholarGoogle Scholar |

Mason RP, Fitzgerald WF (1990). Alkylmercury species in the equatorial Pacific. Nature 347, 457–459.
Alkylmercury species in the equatorial Pacific.Crossref | GoogleScholarGoogle Scholar |

Mason RP, Sheu G-R (2002). Role of the ocean in the global mercury cycle. Global Biogeochem. Cycles 16, 1093
Role of the ocean in the global mercury cycle.Crossref | GoogleScholarGoogle Scholar |

Mason RP, Fitzgerald WF, Morel FMM (1994). The biogeochemical cycling of elemental mercury: anthropogenic influences. Geochimica et Cosmochimica Acta 58, 3191–3198.
The biogeochemical cycling of elemental mercury: anthropogenic influences.Crossref | GoogleScholarGoogle Scholar |

Mason RP, Choi AL, Fitzgerald WF, Hammerschmidt CR, Lamborg CH, Soerensen AL, Sunderland EM (2012). Mercury biogeochemical cycling in the ocean and policy implications. Environmental Research 119, 101–117.
Mercury biogeochemical cycling in the ocean and policy implications.Crossref | GoogleScholarGoogle Scholar |

Matsuyama A, Yano S, Hisano A, Kindaichi M, Sonoda I, Tada A, Akagi H (2016). Distribution and characteristics of methylmercury in surface sediment in Minamata Bay. Marine Pollution Bulletin 109, 378–385.
Distribution and characteristics of methylmercury in surface sediment in Minamata Bay.Crossref | GoogleScholarGoogle Scholar |

Mazrui NM, Jonsson S, Thota S, Zhao J, Mason RP (2016). Enhanced availability of mercury bound to dissolved organic matter for methylation in marine sediments. Geochimica et Cosmochimica Acta 194, 153–162.
Enhanced availability of mercury bound to dissolved organic matter for methylation in marine sediments.Crossref | GoogleScholarGoogle Scholar |

McLean DL, Partridge JC, Bond T, Birt MJ, Bornt KR, Langlois TJ (2017). Using industry ROV videos to assess fish associations with subsea pipelines. Continental Shelf Research 141, 76–97.
Using industry ROV videos to assess fish associations with subsea pipelines.Crossref | GoogleScholarGoogle Scholar |

McLean DL, Ferreira LC, Benthuysen JA, Miller KJ, Schläppy M-L, Ajemian MJ, Berry O, Birchenough SNR, Bond T, Boschetti F, Bull AS, Claisse JT, Condie SA, Consoli P, Coolen JWP, Elliott M, Fortune IS, Fowler AM, Gillanders BM, Harrison HB, Hart KM, Henry L-A, Hewitt CL, Hicks N, Hock K, Hyder K, Love M, Macreadie PI, Miller RJ, Montevecchi WA, Nishimoto MM, Page HM, Paterson DM, Pattiaratchi CB, Pecl GT, Porter JS, Reeves DB, Riginos C, Rouse S, Russell DJF, Sherman CDH, Teilmann J, Todd VLG, Treml EA, Williamson DH, Thums M (2022). Influence of offshore oil and gas structures on seascape ecological connectivity. Global Change Biology 28, 3515–3536.
Influence of offshore oil and gas structures on seascape ecological connectivity.Crossref | GoogleScholarGoogle Scholar |

Melbourne-Thomas J, Hayes KR, Hobday AJ, Little LR, Strzelecki J, Thomson DP, Van Putten I, Hook SE (2021). Decommissioning research needs for offshore oil and gas infrastructure in Australia. Frontiers in Marine Science 8, 711151
Decommissioning research needs for offshore oil and gas infrastructure in Australia.Crossref | GoogleScholarGoogle Scholar |

Merritt KA, Amirbahman A (2009). Mercury methylation dynamics in estuarine and coastal marine environments – a critical review. Earth-Science Reviews 96, 54–66.
Mercury methylation dynamics in estuarine and coastal marine environments – a critical review.Crossref | GoogleScholarGoogle Scholar |

Monperrus M, Tessier E, Amouroux D, Leynaert A, Huonnic P, Donard OFX (2007). Mercury methylation, demethylation and reduction rates in coastal and marine surface waters of the Mediterranean Sea. Marine Chemistry 107, 49–63.
Mercury methylation, demethylation and reduction rates in coastal and marine surface waters of the Mediterranean Sea.Crossref | GoogleScholarGoogle Scholar |

Morel FMM, Kraepiel AML, Amyot M (1998). The chemical cycle and bioaccumulation of mercury. Annual Review of Ecology and Systematics 29, 543–566.
The chemical cycle and bioaccumulation of mercury.Crossref | GoogleScholarGoogle Scholar |

Munson KM, Lamborg CH, Swarr GJ, Saito MA (2015). Mercury species concentrations and fluxes in the central tropical Pacific Ocean. Global Biogeochemical Cycles 29, 656–676.
Mercury species concentrations and fluxes in the central tropical Pacific Ocean.Crossref | GoogleScholarGoogle Scholar |

Munson KM, Lamborg CH, Boiteau RM, Saito MA (2018). Dynamic mercury methylation and demethylation in oligotrophic marine water. Biogeosciences 15, 6451–6460.
Dynamic mercury methylation and demethylation in oligotrophic marine water.Crossref | GoogleScholarGoogle Scholar |

Ndungu K, Schaanning M, Braaten HFV (2016). Effects of organic matter addition on methylmercury formation in capped and uncapped marine sediments. Water Research 103, 401–407.
Effects of organic matter addition on methylmercury formation in capped and uncapped marine sediments.Crossref | GoogleScholarGoogle Scholar |

Ndungu K, Beylich BA, Staalstrøm A, Øxnevad S, Berge JA, Braaten HFV, Schaanning M, Bergstrøm R (2017). Petroleum oil and mercury pollution from shipwrecks in Norwegian coastal waters. Science of the Total Environment 593-594, 624–633.
Petroleum oil and mercury pollution from shipwrecks in Norwegian coastal waters.Crossref | GoogleScholarGoogle Scholar |

Oliveri E, Salvagio Manta D, Bonsignore M, Cappello S, Tranchida G, Bagnato E, Sabatino N, Santisi S, Sprovieri M (2016). Mobility of mercury in contaminated marine sediments: biogeochemical pathways. Marine Chemistry 186, 1–10.
Mobility of mercury in contaminated marine sediments: biogeochemical pathways.Crossref | GoogleScholarGoogle Scholar |

Paranjape AR, Hall BD (2017). Recent advances in the study of mercury methylation in aquatic systems. FACETS 2, 85–119.
Recent advances in the study of mercury methylation in aquatic systems.Crossref | GoogleScholarGoogle Scholar |

Parks JM, Johs A, Podar M, Bridou R, Hurt Jr RA, Smith SD, Tomanicek SJ, Qian Y, Brown SD, Brandt CC, Palumbo AV, Smith JC, Wall JD, Elias DA, Liang L (2013). The genetic basis for bacterial mercury methylation. Science 339, 1332–1335.
The genetic basis for bacterial mercury methylation.Crossref | GoogleScholarGoogle Scholar |

Pirrone N, Cinnirella S, Feng X, Finkelman RB, Friedli HR, Leaner J, Mason R, Mukherjee AB, Stracher GB, Streets DG, Telmer K (2010). Global mercury emissions to the atmosphere from anthropogenic and natural sources. Atmospheric Chemistry and Physics 10, 5951–5964.
Global mercury emissions to the atmosphere from anthropogenic and natural sources.Crossref | GoogleScholarGoogle Scholar |

Podar M, Gilmour CC, Brandt CC, Soren A, Brown SD, Crable BR, Palumbo AV, Somenahally AC, Elias DA (2015). Global prevalence and distribution of genes and microorganisms involved in mercury methylation. Science Advances 1, e1500675–e1500675.
Global prevalence and distribution of genes and microorganisms involved in mercury methylation.Crossref | GoogleScholarGoogle Scholar |

Poulain AJ, Barkay T (2013). Cracking the mercury methylation code. Science 339, 1280–1281.
Cracking the mercury methylation code.Crossref | GoogleScholarGoogle Scholar |

Raihan SM, Moniruzzaman M, Park Y, Lee S, Bai SC (2020). Evaluation of dietary organic and inorganic mercury threshold levels on induced mercury toxicity in a marine fish model. Animals 10, 405
Evaluation of dietary organic and inorganic mercury threshold levels on induced mercury toxicity in a marine fish model.Crossref | GoogleScholarGoogle Scholar |

Regnell O, Watras CJ (2019). Microbial mercury methylation in aquatic environments: a critical review of published field and laboratory studies. Environmental Science & Technology 53, 4–19.
Microbial mercury methylation in aquatic environments: a critical review of published field and laboratory studies.Crossref | GoogleScholarGoogle Scholar |

Ren Z, Cao L, Huang W, Liu J, Cui W, Dou S (2019). Toxicity test assay of waterborne methylmercury on the Japanese flounder (Paralichthys olivaceus) at embryonic-larval stages. Bulletin of Environmental Contamination and Toxicology 102, 770–777.
Toxicity test assay of waterborne methylmercury on the Japanese flounder (Paralichthys olivaceus) at embryonic-larval stages.Crossref | GoogleScholarGoogle Scholar |

Rua-Ibarz A, Bolea-Fernandez E, Maage A, Frantzen S, Valdersnes S, Vanhaecke F (2016). Assessment of Hg pollution released from a WWII submarine wreck (U-864) by Hg isotopic analysis of sediments and Cancer pagurus tissues. Environmental Science & Technology 50, 10361–10369.
Assessment of Hg pollution released from a WWII submarine wreck (U-864) by Hg isotopic analysis of sediments and Cancer pagurus tissues.Crossref | GoogleScholarGoogle Scholar |

Sattarova VV, Aksentov KI (2018). Geochemistry of mercury in surface sediments of the Kuril Basin of the Sea of Okhotsk, Kuril-Kamchatka Trench and adjacent abyssal plain and northwest part of the Bering Sea. Deep Sea Research Part II: Topical Studies in Oceanography 154, 24–31.
Geochemistry of mercury in surface sediments of the Kuril Basin of the Sea of Okhotsk, Kuril-Kamchatka Trench and adjacent abyssal plain and northwest part of the Bering Sea.Crossref | GoogleScholarGoogle Scholar |

Schartup AT, Balcom PH, Mason RP (2014). Sediment-porewater partitioning, total sulfur, and methylmercury production in estuaries. Environmental Science & Technology 48, 954–960.
Sediment-porewater partitioning, total sulfur, and methylmercury production in estuaries.Crossref | GoogleScholarGoogle Scholar |

Schläppy M-L, Robinson LM, Camilieri-Asch V, Miller K (2021). Trash or treasure? Considerations for future ecological research to inform oil and gas decommissioning. Frontiers in Marine Science 8, 642539
Trash or treasure? Considerations for future ecological research to inform oil and gas decommissioning.Crossref | GoogleScholarGoogle Scholar |

Shi J-B, Liang L-N, Yuan C-G, He B, Jiang G-B (2005). Methylmercury and total mercury in sediments collected from the East China Sea. Bulletin of Environmental Contamination and Toxicology 74, 980–987.
Methylmercury and total mercury in sediments collected from the East China Sea.Crossref | GoogleScholarGoogle Scholar |

Simpson SL, Batley GE (2016) ‘Sediment Quality Assessment; a Practical Handbook’. (CSIRO Publishing: Melbourne, Vic., Australia)

Soerensen AL, Sunderland EM, Holmes CD, Jacob DJ, Yantosca RM, Skov H, Christensen JH, Strode SA, Mason RP (2010). An improved global model for air-sea exchange of mercury: high concentrations over the North Atlantic. Environmental Science & Technology 44, 8574–8580.
An improved global model for air-sea exchange of mercury: high concentrations over the North Atlantic.Crossref | GoogleScholarGoogle Scholar |

Sommer B, Fowler AM, Macreadie PI, Palandro DA, Aziz AC, Booth DJ (2019). Decommissioning of offshore oil and gas structures – environmental opportunities and challenges. Science of the Total Environment 658, 973–981.
Decommissioning of offshore oil and gas structures – environmental opportunities and challenges.Crossref | GoogleScholarGoogle Scholar |

Sonke JE, Heimbürger L-E, Dommergue A (2013). Mercury biogeochemistry: paradigm shifts, outstanding issues and research needs. Comptes Rendus Geoscience 345, 213–224.
Mercury biogeochemistry: paradigm shifts, outstanding issues and research needs.Crossref | GoogleScholarGoogle Scholar |

Sørensen N, Murata K, Budtz-Jørgensen E, Weihe P, Grandjean P (1999). Prenatal methylmercury exposure as a cardiovascular risk factor at seven years of age. Epidemiology 10, 370–375.
Prenatal methylmercury exposure as a cardiovascular risk factor at seven years of age.Crossref | GoogleScholarGoogle Scholar |

Sunderland EM (2007). Mercury exposure from domestic and imported estuarine and marine fish in the U.S. seafood market. Environmental Health Perspectives 115, 235–242.
Mercury exposure from domestic and imported estuarine and marine fish in the U.S. seafood market.Crossref | GoogleScholarGoogle Scholar |

Sunderland EM, Mason RP (2007). Human impacts on open ocean mercury concentrations. Global Biogeochemical Cycles 21, GB4022
Human impacts on open ocean mercury concentrations.Crossref | GoogleScholarGoogle Scholar |

Sunderland EM, Krabbenhoft DP, Moreau JW, Strode SA, Landing WM (2009). Mercury sources, distribution, and bioavailability in the North Pacific Ocean: Insights from data and models. Global Biogeochemical Cycles 23, GB2010
Mercury sources, distribution, and bioavailability in the North Pacific Ocean: Insights from data and models.Crossref | GoogleScholarGoogle Scholar |

Tian L, Guan W, Ji Y, He X, Chen W, Alvarez PJJ, Zhang T (2021). Microbial methylation potential of mercury sulfide particles dictated by surface structure. Nature Geoscience 14, 409–416.
Microbial methylation potential of mercury sulfide particles dictated by surface structure.Crossref | GoogleScholarGoogle Scholar |

Tomiyasu T, Matsuyama A, Eguchi T, Fuchigami Y, Oki K, Horvat M, Rajar R, Akagi H (2006). Spatial variations of mercury in sediment of Minamata Bay, Japan. Science of The Total Environment 368, 283–290.
Spatial variations of mercury in sediment of Minamata Bay, Japan.Crossref | GoogleScholarGoogle Scholar |

Tornero V, Hanke G (2016). Chemical contaminants entering the marine environment from sea-based sources: a review with a focus on European seas. Marine Pollution Bulletin 112, 17–38.
Chemical contaminants entering the marine environment from sea-based sources: a review with a focus on European seas.Crossref | GoogleScholarGoogle Scholar |

Turner A, Millward GE, Le Roux SM (2001). Sediment-water partitioning of inorganic mercury in estuaries. Environ. Sci. Technol 35, 4648–4654.
Sediment-water partitioning of inorganic mercury in estuaries.Crossref | GoogleScholarGoogle Scholar |

UNEP (2020) Progress report 2020. Overview of the Minamata Convention on Mercury Activities. Available at https://www.mercuryconvention.org/sites/default/files/2021-06/Minamata-Progress-report-2020.pdf [accessed 1 April 2022]

UNEP (2021) UN Environment Program. Minamata Convention on Mercury. Available at https://www.mercuryconvention.org/en [accessed 1 April 2022]

Uriansrud F, Kskei K, Schoyen M (2005) Miljøkonsekvensvurdering av kvikksølv ved sunket ubåt U-864, Fedje i Hordaland. Fase 1. Kvikksølvkartlegging. NIVA Report No. 5022-2005 (Norwegian)

URS (2009) Ichthys Gas Field Development Project. Nearshore Marine Water Quality and Sediment Study. Available at https://ntepa.nt.gov.au/__data/assets/pdf_file/0005/287483/draft_eis_appendix_9.pdf [accessed 1 November 2021]

URS (2019) Appendix 9 Nearshore marine water quality and sediment study. Available at https://ntepa.nt.gov.au/__data/assets/pdf_file/0005/287483/draft_eis_appendix_9.pdf [accessed 1 November 2021]

USEPA (1985) Guidelines for deriving numerical national water quality criteria for the protection of aquatic organisms and their uses. Available at https://www.epa.gov/wqc/guidelines‐deriving‐numerical‐national‐water‐quality‐criteria‐protection‐aquatic‐organisms‐and [accessed 1 October 2021]

USEPA (2001) Guidance for implementing the January 2001 methylmercury water quality criterion. Available at https://www.epa.gov/sites/default/files/2019-02/documents/guidance-implement-methylmercury-2001.pdf [accessed 1 October 2021]

van Dam RA, Hogan AC, Harford AJ, Humphrey CL (2019). How specific is site‐specific? A review and guidance for selecting and evaluating approaches for deriving local water quality benchmarks. Integrated Environmental Assessment and Management 15, 683–702.
How specific is site‐specific? A review and guidance for selecting and evaluating approaches for deriving local water quality benchmarks.Crossref | GoogleScholarGoogle Scholar |

Wang K, Munson KM, Armstrong DA, Macdonald RW, Wang F (2020). Determining seawater mercury methylation and demethylation rates by the seawater incubation approach: A critique. Marine Chemistry 219, 103753–103753.
Determining seawater mercury methylation and demethylation rates by the seawater incubation approach: A critique.Crossref | GoogleScholarGoogle Scholar |

Waples JS, Nagy KL, Aiken GR, Ryan JN (2005). Dissolution of cinnabar (HgS) in the presence of natural organic matter. Geochimica et Cosmochimica Acta 69, 1575–1588.
Dissolution of cinnabar (HgS) in the presence of natural organic matter.Crossref | GoogleScholarGoogle Scholar |

Warne MSJ, Batley GE, Braga O, Chapman JC, Fox DR, Hickey CW, Stauber JL, Van Dam R (2014). Revisions to the derivation of the Australian and New Zealand guidelines for toxicants in fresh and marine waters. Environmental Science and Pollution Research 21, 51–60.
Revisions to the derivation of the Australian and New Zealand guidelines for toxicants in fresh and marine waters.Crossref | GoogleScholarGoogle Scholar |

Watras CJ, Bloom N (1994) The vertical distribution of mercury species in Wisconsin lakes: accumulation in plankton layers. In ‘Mercury Pollution: Integration and Synthesis’. Limnology Library 730163. (Lewis Publishers: Chelsea, MI, USA)

Weber JH (1993). Review of possible paths for abiotic methylation of mercury(II) in the aquatic environment. Chemosphere 26, 2063–2077.
Review of possible paths for abiotic methylation of mercury(II) in the aquatic environment.Crossref | GoogleScholarGoogle Scholar |

Wenziker K, Mcalpine K, Apte S, Masini R (2006) Background quality for coastal marine waters of the North West Shelf, Western Australia. Technical Report. Available at https://www.epa.wa.gov.au/sites/default/files/Policies_and_Guidance/NWSJEMS%20Technical%20Report-NWS%20BG%20WaterQual.pdf [accessed 1 November 2021]

Wilhelm SM, Nelson M (2010) Interaction of Elemental Mercury with Steel Surfaces. The Journal of Corrosion Science and Engineering. Volume 13, preprint 38, University of Manchester.

Woodside (2019) Proposed Browse to NWS Project. Draft EIS/ERD. Available at https://www.woodside.com.au/docs/default-source/current-consultation-activities/australian-activties/propsed-browse-to-north-west-shelf-project---draft-eis-erd.pdf [accessed 1 November 2021]

Woodside (2020) Scarborough Offshore Project Proposal. Available at https://www.woodside.com.au/docs/default-source/our-business---documents-and-files/burrup-hub---documents-and-files/scarborough---documents-and-files/scarborough-offshore-project-proposal.pdf [accessed 1 April 2022]

Wu Y, Wang W-X (2011). Accumulation, subcellular distribution and toxicity of inorganic mercury and methylmercury in marine phytoplankton. Environmental Pollution 159, 3097–3105.
Accumulation, subcellular distribution and toxicity of inorganic mercury and methylmercury in marine phytoplankton.Crossref | GoogleScholarGoogle Scholar |

Wu Q, Apte SC, Batley GE, Bowles KC (1997). Determination of the mercury complexation capacity of natural waters by anodic stripping voltammetry. Analytica Chimica Acta 350, 129–134.
Determination of the mercury complexation capacity of natural waters by anodic stripping voltammetry.Crossref | GoogleScholarGoogle Scholar |

Ye X, Fisher NS (2020). Minor effects of dietary methylmercury on growth and reproduction of the sheepshead minnow Cyprinodon variegatus and toxicity to their offspring. Environmental Pollution 266, 115226
Minor effects of dietary methylmercury on growth and reproduction of the sheepshead minnow Cyprinodon variegatus and toxicity to their offspring.Crossref | GoogleScholarGoogle Scholar |

Yu X, Wu FZ, Xu XQ, Chen QZ, Huang L, Tesfai BT, Cao L, Xu XD, Dou SZ, Huang W (2019). Effects of short term methylmercury exposure on growth and development of the large yellow croaker embryos and larvae. Frontiers in Marine Science 6, 754
Effects of short term methylmercury exposure on growth and development of the large yellow croaker embryos and larvae.Crossref | GoogleScholarGoogle Scholar |

Zhang T, Kim B, Levard C, Reinsch BC, Lowry GV, Deshusses MA, Hsu-Kim H (2012). Methylation of mercury by bacteria exposed to dissolved, nanoparticulate, and microparticulate mercuric sulfides. Environmental Science & Technology 46, 6950–6958.
Methylation of mercury by bacteria exposed to dissolved, nanoparticulate, and microparticulate mercuric sulfides.Crossref | GoogleScholarGoogle Scholar |

Zhao L, Chen H, Lu X, Lin H, Christensen GA, Pierce EM, Gu B (2017). Contrasting effects of dissolved organic matter on mercury methylation by Geobacter sulfurreducens PCA and Desulfovibrio desulfuricans ND132. Environmental Science & Technology 51, 10468–10475.
Contrasting effects of dissolved organic matter on mercury methylation by Geobacter sulfurreducens PCA and Desulfovibrio desulfuricans ND132.Crossref | GoogleScholarGoogle Scholar |