Assessment of trace element geochemistry of Hampton Roads harbor and lower Chesapeake Bay area sediments |
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| Authors: | Rule Joseph H |
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| Institution: | (1) Department of Geological Sciences, Old Dominion University, 23508 Norfolk, Virginia |
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| Abstract: | Acid extractable Cd, Co, Cr, Cu, Fe, Mn, Ni, Pb. and Zn were determined in sediments from the Inner Virginia Shelf, and from
shipping channels in the lower Chesapeake Bay and Hampton Roads, Virginia, harbor system. Data were evaluated by a variety
of techniques Levels of Cd, Cu, Pb, and Zn exceeded average crustal abundances for most of the study sites. Cumulative frequency
curves suggested that there were two major populations for all metals and perhaps a third and smaller, one for Cd, Cr, and
Mn Plots of metal vs Fe indicated no anthropogenic inputs of metals for shelf and Chesapeake Bay channel sites, but suggested
anthropogenic influences for all metals in several of the inshore sites. Enrichment factor calculations showed enrichment
of Cd, Pb, and Zn with respect to average crustal abundances for all sites and of Cu for the industrial harbor system. A recommendation
of this study for evaluation of environmental geochemical metals data is to utilize mean concentrations, cumulative frequency
plots, and metal vs Fe and/or enrichment factor calculations when evaluating the pollution status of sediments. |
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