Regional geochemistry of trace elements in Chesapeake Bay sediments |
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| Authors: | S A Sinex G R Helz |
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| Institution: | (1) Department of Chemistry, University of Maryland, College Park, Maryland |
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| Abstract: | The concentrations of Cr, Mn, Fe, Co, Ni, Cu, Zn, Cd, and Pb in 177 surface sediment samples from throughout Chesapeake Bay
are reported. Analyses were made of both unfractionated samples and the <63 μm fractions. Analytical uncertainty, always less
than ±10%, controlled reproducibility in analyses of the <63 μm fractions, but sampling variance controlled reproducibility
in the unfractionated samples, especially when coarse-grained sediments were being analyzed. Sediments in the northernmost
part of the bay are enriched relative to average continental crust in all elements except Cr. This reflects the composition
of dissolved and suspended material being delivered to that region by the Susquehanna River. The enriched sediments appear
not to be transported south of Baltimore in significant quantily. Zinc, cadmium, and lead are enriched relative to average
crust throughout the bay and in most other estuaries in the eastern United States. |
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