Produção Nacional
Revisado por pares
Organic-copper interactions in Guanabara Bay, Brazil. An electrochemical study of copper complexation by dissolved organic material in a tropical bay
1986; Elsevier BV; Volume: 58; Issue: 1-2 Linguagem: Inglês
10.1016/0048-9697(86)90073-2
ISSN1879-1026
AutoresConstant M.G. van den Berg, Angela de Luca Rebello,
Tópico(s)Environmental Toxicology and Ecotoxicology
ResumoOrganic-copper interactions were studied in Guanabara Bay, Brazil, which represents an example of highly productive, polluted, tropical, coastal waters. Copper speciation was measured by cathodic stripping voltammetry and ligand competition with catechol. The ligand concentrations detected were high and varied between 40 and 300 nM, with conditional stability constants, log K′ values, for complexes with copper varying between 9.6 and 12.4. The organic copper in most samples amounted to 99.5–99.9% of total dissolved copper. The ligand concentrations varied with depth, with time and with place, suggesting that these ligands were produced and broken down during primary production and heterotrophic activity. High ligand concentrations were found to be associated with high photosynthetic activity (high pH) of the samples.
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