Abstract
A considerable amount of chemical data is available for surficial sediments in Port Jackson. Some of the highest concentrations of heavy metals, organochlorines and polycyclic aromatic hydrocarbons of any capital port occur in sediments mantling shallow tributaries and embayments close to central Sydney. However, these data have limited ability to predict adverse effects on living resources and in the absence of toxicological data, sediment quality guidelines (SQG) have been used to assess the possible adverse biological effects of sedimentary contaminants in this estuary. Several SQGs are currently available for both fresh and marine environments, but the scheme used in the current study is based on empirical analysis of matching chemical and biological data compiled by the National Oceanographic and Atmospheric Administration (NOAA) in the U.S. The NOAA SQG can be used to assess individual chemicals, or to estimate the probability of acute sediment toxicity by calculating `mean quotients' for a large range of contaminants. Although many individual chemicals in sediment exceed SQG over extensive parts of Port Jackson, `mean quotient' results suggest that only a small proportion (∼1%) of the harbour may be highly toxic (74% probability of toxicity). However, sediment in a considerably larger proportion of the port (almost 25%) is estimated to have a 49% probability of being toxic using the `mean quotient' approach. These results are indicative at best and contemporaneous chemical/biological/ecotoxicological studies are needed to verify the applicability of SQG developed in the U.S. for use outside North America and site specific studies of this type are still required to determine the toxicity of sediments in Port Jackson.
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Birch, G.F., Taylor, S.E. Assessment of possible sediment toxicity of contaminated sediments in Port Jackson, Sydney, Australia. Hydrobiologia 472, 19–27 (2002). https://doi.org/10.1023/A:1016300629297
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DOI: https://doi.org/10.1023/A:1016300629297