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Title: Pore water distributions of dissolved copper and copper-complexing ligands in estuarine and coastal marine sediments

Abstract

The distributions and seasonal variability of total dissolved Cu (TDCu) and Cu-complexing ligands in sediment pore waters have been investigated at two contrasting sites in the Chesapeake Bay. Two ligand classes, which differ on the basis of the conditional stability constants (K{prime}{sub cond}) of their Cu complexes, were detected at all depths at both sites. For comparison, one pore water profile from a slope station off of the Chesapeake Bay also showed the presence of two ligand classes. Virtually all TDCu fluxing from these sediments is complexed during sediment-water exchange. A relatively small fraction of the TDCu is exchanged as inorganic species, which are widely regarded as the most bioavailable form of Cu. Total ligand concentrations are 15 to >100 times higher in the upper intervals of the pore waters relative to ligand concentrations in the bottom waters of the Chesapeake Bay (30--60 nM), consistent with previous observations of fluxes of these ligands from the sediments to overlying waters. These results suggest that sediments are potentially significant sources of Cu-complexing ligands to the overlying waters of the Chesapeake Bay, and perhaps, other shallow water estuarine and coastal environments. Copper-complexing ligands released from sediment pore waters may play an important rolemore » in influencing Cu speciation in overlying waters.« less

Authors:
; ;
Publication Date:
Research Org.:
Old Dominion Univ., Norfolk, VA (US)
OSTI Identifier:
20076123
Resource Type:
Journal Article
Journal Name:
Geochimica et Cosmochimica Acta
Additional Journal Information:
Journal Volume: 64; Journal Issue: 11; Other Information: PBD: Jun 2000; Journal ID: ISSN 0016-7037
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; INTERSTITIAL WATER; WATER CHEMISTRY; COPPER; COPPER COMPOUNDS; ECOLOGICAL CONCENTRATION; SEDIMENTS; SEASONAL VARIATIONS; CHESAPEAKE BAY; BIOLOGICAL AVAILABILITY

Citation Formats

Skrabal, S.A., Donat, J.R., and Burdige, D.J. Pore water distributions of dissolved copper and copper-complexing ligands in estuarine and coastal marine sediments. United States: N. p., 2000. Web. doi:10.1016/S0016-7037(99)00387-7.
Skrabal, S.A., Donat, J.R., & Burdige, D.J. Pore water distributions of dissolved copper and copper-complexing ligands in estuarine and coastal marine sediments. United States. doi:10.1016/S0016-7037(99)00387-7.
Skrabal, S.A., Donat, J.R., and Burdige, D.J. Thu . "Pore water distributions of dissolved copper and copper-complexing ligands in estuarine and coastal marine sediments". United States. doi:10.1016/S0016-7037(99)00387-7.
@article{osti_20076123,
title = {Pore water distributions of dissolved copper and copper-complexing ligands in estuarine and coastal marine sediments},
author = {Skrabal, S.A. and Donat, J.R. and Burdige, D.J.},
abstractNote = {The distributions and seasonal variability of total dissolved Cu (TDCu) and Cu-complexing ligands in sediment pore waters have been investigated at two contrasting sites in the Chesapeake Bay. Two ligand classes, which differ on the basis of the conditional stability constants (K{prime}{sub cond}) of their Cu complexes, were detected at all depths at both sites. For comparison, one pore water profile from a slope station off of the Chesapeake Bay also showed the presence of two ligand classes. Virtually all TDCu fluxing from these sediments is complexed during sediment-water exchange. A relatively small fraction of the TDCu is exchanged as inorganic species, which are widely regarded as the most bioavailable form of Cu. Total ligand concentrations are 15 to >100 times higher in the upper intervals of the pore waters relative to ligand concentrations in the bottom waters of the Chesapeake Bay (30--60 nM), consistent with previous observations of fluxes of these ligands from the sediments to overlying waters. These results suggest that sediments are potentially significant sources of Cu-complexing ligands to the overlying waters of the Chesapeake Bay, and perhaps, other shallow water estuarine and coastal environments. Copper-complexing ligands released from sediment pore waters may play an important role in influencing Cu speciation in overlying waters.},
doi = {10.1016/S0016-7037(99)00387-7},
journal = {Geochimica et Cosmochimica Acta},
issn = {0016-7037},
number = 11,
volume = 64,
place = {United States},
year = {2000},
month = {6}
}