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The aim of this investigation was to assess the chemical speciation of copper. Although the Cu concentrations in both the dissolved and particulate phases differ strongly between the Oosterschelde (OS) and Westerschelde (WS) estuaries, The Netherlands, the Cu content of the bivalve Macoma balthica from both sea arms is comparable. Therefore, chemical speciation of Cu was examined during 1 year at Mo sites, one in each sea arm. Two dissolved organic ligand groups could be distinguished. For both sea arms, a relatively weak ligand group with logK'=9.27 and a mean ligand concentration of 250 neq Cu l(-1) was determined. Moreover, a relatively strong group was detected with logK'=13.04 and a mean ligand concentration of 180 neq Cu l(-1) in the WS, and with logK'=13.7 and a mean ligand concentration of 48 neq Cu l(-1) in the OS. In both sea arms, the calculated free concentration of CU2+ is extremely low (
Original languageEnglish
Pages (from-to)629-643
JournalEstuarine Coastal and Shelf Science
Issue number5
StatePublished - 1996

ID: 122394