PCDD/PCDF sediment concentration distribution: Casco Bay, Maine, USA
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A comprehensive evaluation of sediment quality in Casco Bay for 2,3,7,8-polychlorinated dibenzo-p-dioxins and 2,3,7,8-polychlorinateddibenzofurans (PCDD/PCDF) was undertaken by the analyses of 30 sediment samples. PCDD/PCDF were detected in sediments from all areas of Casco Bay. The concentrations were highest near potential input sources. For example, PCDD/PCDF and especially 2,3,7,8-tetrachloro-p-dioxin and 2,3,7,8-tetrachlorodibenzofurans (TCDD/TCDF) had higher concentrations near the Presumpscot River sites, 10 miles down stream of a pulp and paper mill. There are also exceptions, for example the higher PCDD/PCDF concentrations in East Bay are not near known point sources, but may be the result of transport into the bay from sources in the Kennebec/Androscoggin River or localized combustion sources. The concentrations of PCDD/PCDF found in Casco Bay sediments are in the range expected when compared to similar estuarine areas. In spite of the low concentration in sediment, detection of 2,3,7,8-TCDD/TCDF in lobster tissue and tomalley indicate these compounds are bioavailable, and have resulted in an advisory regarding consumption of lobster tomalley from Casco Bay.
author list (cited authors)
Wade, T. L., Jackson, T. J., Gardinali, P. R., & Chambers, L.