Spatial Variability of Total Dissolved Copper and Copper Speciation in the Inshore Waters of Bermuda

Authors

Véronique Oldham, Bermuda Institute of Ocean Sciences
M. M. Swenson, Bermuda Institute of Ocean Sciences
Kristen N. Buck, University of South FloridaFollow

Document Type

Article

Publication Date

2-15-2014

Keywords

Dissolved copper, Copper speciation, Competitive ligand exchange-adsorptive cathodic stripping voltammetry (CLE-ACSV), Bermuda, Sargasso Sea

Digital Object Identifier (DOI)

https://doi.org/10.1016/j.marpolbul.2013.12.016

Abstract

Total dissolved copper (Cu) and Cu speciation were examined from inshore waters of Bermuda, in October 2009 and July–August 2010, to determine the relationship between total dissolved Cu, Cu-binding ligands and bioavailable, free, hydrated Cu²⁺ concentrations. Speciation was performed using competitive ligand exchange-adsorptive cathodic stripping voltammetry (CLE-ACSV). Mean total dissolved Cu concentrations ranged from 1.4 nM to 19.2 nM, with lowest concentrations at sites further from shore, consistent with previous measurements in the Sargasso Sea, and localized Cu enrichment inshore in enclosed harbors. Ligand concentrations exceeded dissolved [Cu] at most sites, and [Cu²⁺] were correspondingly low at those sites, typically <10⁻¹³ M. One site, Hamilton Harbour, was found to have [Cu] in excess of ligands, resulting in [Cu²⁺] of 10^−10.7 M, and indicating that Cu may be toxic to phytoplankton here.

Was this content written or created while at USF?

Yes

Citation / Publisher Attribution

Marine Pollution Bulletin, v. 79, issue 1-2, p. 314-320

Scholar Commons Citation

Oldham, Véronique; Swenson, M. M.; and Buck, Kristen N., "Spatial Variability of Total Dissolved Copper and Copper Speciation in the Inshore Waters of Bermuda" (2014). Marine Science Faculty Publications. 607.
https://digitalcommons.usf.edu/msc_facpub/607