Contaminant pathways in Port Curtis: Final report - OzCoasts

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Contaminant pathways in Port Curtis: Final report2: Dissolved trace metals3. Surveying of the Fitzroy River to above Rockhampton indicated that this majorriver is a source of dissolved metals to the local coastal region. In particular,the Fitzroy contains elevated nickel concentrations which are consistent withsediment studies conducted by the Coastal Zone CRC. Under some flowconditions, the Fitzroy plume may enter The Narrows region and potentiallysupply dissolved metals to Port Curtis.4. There were no conspicuous sources of trace metal within Port Curtis. Metalsin suspended and benthic sediments are low and are not a likely source oftrace metals to the water column. The trace metal distributions in Port Curtisare likely to reflect a mixture of metal inputs including industrial discharges,mobilisation of metals from mangrove regions in The Narrows and the FitzroyRiver plume. Deconvoluting these multiple sources is difficult. Modelling ofcontaminant inputs using a version of the Port Curtis hydrodynamic modelmodified to include inputs from the Fitzroy and The Narrows is probably themost effective way of understanding this complex issue.5. Salinity and pH gradients were observed in Port Curtis. Salinities tend to behigher in the north of Port Curtis than in the surrounding coastal waters. Thiscould reflect evaporation losses in these more sheltered areas where watercirculation is restricted. Water column pH was lowest in The Narrows regionsand is most likely related to acid inputs from the adjacent mangrove regions.6. Particulate metals data indicated that desorption of metals from suspendedsediments is unlikely to be a major source of dissolved trace metals. Theconcentrations of copper and zinc in suspended sediments were, in mostparts, typical of the benthic sediments and did not indicate enrichment ofthese metals. Trace metal inputs to Port Curtis which contribute to theobserved dissolved metal concentrations are most likely to be delivered insolution form.19
Contaminant pathways in Port Curtis: Final report2: Dissolved trace metals2.5 ReferencesApte, S.C. and Day, G.M. (1998) Dissolved metal concentrations in the Torres Straitand Gulf of Papua. Marine Pollution Bulletin, 30, 298–304.Apte, S.C., Batley, G.E. and Maher, W.A. (2002) Monitoring of trace metals andmetalloids in natural waters. Chapter 6 in Handbook of EnvironmentalMonitoring, Eds F. Burden, U. Forstner, A. Guenther and I. McKelvie, McGrawHill, New York.Apte, S.C., Batley, G.E., Szymczak, R., Rendell, P.S., Lee, R. and Waite, T.D.(1998) Baseline trace metal concentrations in New South Wales coastal waters.Marine and Freshwater Research, 49, 203–214.Apte, S.C., Jones, M.-A., Simpson, S.L., Stauber, J.L., Vicente-Beckett, V.,Duivenvoorden, L., Johnson, R. and Revill, A. (2005) Contaminants in PortCurtis: screening level risk assessment. Technical Report No. 25, CRC forCoastal Zone, Estuary and Waterway Management, Brisbane.Clark, M.W., McConchie, D., Lewis, D.W. and Saenger, P. (1998) Redoxstratification and heavy metal partitioning in Avicennia-dominated mangrovesediments: a geochemical model. Chemical Geology, 149, 147–171.Comber, S.D.W., Gunn, A.M. and Whalley, C. (1995) Comparison of the partitioningof trace metals in the Humber and Mersey estuaries. Marine Pollution Bulletin,30, 851–860.Hatje, V., Apte, S.C., Hales, L.T. and Birch, G.F. (2003) Dissolved trace metaldistributions in Port Jackson estuary (Sydney Harbour) Australia. MarinePollution Bulletin, 46, 719–730.Hatje, V., Birch, G.F. and Hill, D.M. (2001) Spatial and temporal variability ofparticulate trace metals in Port Jackson Estuary, Australia. Estuarine Coastaland Shelf Science, 53, 63–77.Kremling, K. and Pohl, C. (1989) Studies on the spatial and seasonal variability ofdissolved cadmium, copper and nickel in north-east Atlantic surface waters.Marine Chemistry, 27, 43–60.Kristensen, E. (2000) Organic matter diagensis at the oxic/anoxic interface incoastal marine sediments, with emphasis on the role of burrowing animals.Hydrobiologia, 426, 1–24.Mackey, D.J., O’Sullivan, R.J., Watson, G. and Pont, D. (2002) Trace metals in theWestern Pacific: temporal and spatial variability in the concentrations of Cd, Cu,Mn and Ni. Deep Sea Research, 49, 2241–2259.20
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