2024-03-28T18:49:40Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/553012020-06-01T12:57:42Zcom_10261_47com_10261_8col_10261_300
DIGITAL.CSIC
author
Santos-Echeandía, Juan
author
Laglera, Luis M.
author
Prego, R.
author
Berg, Constant M. G. van den
2012-08-30T10:47:31Z
2012-08-30T10:47:31Z
2008
Marine Chemistry 108(3-4): 148-158 (2008)
0304-4203
http://hdl.handle.net/10261/55301
10.1016/j.marchem.2007.11.004
The chemical speciation of copper in the estuarine waters of the Vigo Ria was determined by titrations with salicylaldoxime
(reverse copper titrations) and with copper (forward titrations). The forward titrations quantified the concentrations of ligands
present in excess whereas the reverse titrations demonstrated the presence of low concentrations of very strong binding ligands,
approximately matching the copper concentration. The data obtained by the reverse titrations indicated that copper was about 10×
stronger bound than data based on the usual forward titrations.
The copper concentration in these ria waters was low at 5 nM with a minor mid-estuarine maximum of 8 nM. These copper
levels are amongst the lowest reported for estuarine waters and therefore represent uncontaminated waters. The concentration of
inorganic copper was very low across the ria at ∼10–100 fM, except at Bouzas harbour (salinity 35.5) where it was raised to
∼1 pM due to copper contamination, in waters affected by the port facilities, to total levels of 15 to 20 nM copper, exceeding the
concentration of the very strong ligand detected by the reverse titrations.
eng
closedAccess
Copper complexation
Cathodic stripping voltammetry
Metal speciation
Organic complexing ligands
Copper speciation in estuarine waters by forward and reverse titrations
artículo
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