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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

The effects of solar irradiation on copper speciation and organic complexation

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Author(s):
Tonietto, Alessandra E. [1] ; Lombardi, Ana Teresa [2, 1] ; Vieira, Armando A. H. [2]
Total Authors: 3
Affiliation:
[1] Univ Fed Sao Carlos, PPGQ, Dept Quim, BR-13565905 Sao Carlos, SP - Brazil
[2] Univ Fed Sao Carlos, Dept Bot, BR-13565905 Sao Carlos, SP - Brazil
Total Affiliations: 2
Document type: Journal article
Source: Journal of the Brazilian Chemical Society; v. 22, n. 9, p. 1695-1700, SEP 2011.
Web of Science Citations: 6
Abstract

The aims of this research were to evaluate the effects of solar irradiation on copper speciation in water samples obtained in eutrophic and metal contaminated reservoir. Anodic stripping voltammetry and ion selective electrode were used for metal determinations of solar irradiated and non-irradiated samples. The results showed that after 7 h of solar irradiation, dissolved organic matter (DOM) was degraded promoting the increase of labile, free Cu2+ ions and dissolved inorganic carbon (DIC). Decreases of ligand concentration (C L) and dissolved organic carbon (DOC) were also observed. Conditional stability constant (logK') values varied for two sampling sites, but remained unchanged for the others. The present results demonstrated that photochemical reactions affected copper speciation and Cu-DOM interactions. This research is a contribution to the understanding of biogeochemical cycle of copper and highlights some ecological implications of photooxidation in freshwater ecosystems, such as the increase of copper bioavailability. (AU)

FAPESP's process: 05/51263-5 - Fate of dissolved organic matter released by Cyanobacteria in an eutrophic reservoir (Tietê River): studies of processes
Grantee:Armando Augusto Henriques Vieira
Support Opportunities: Research Projects - Thematic Grants
FAPESP's process: 08/03487-0 - Microalgae culture in photobioreactor as a tool for atmospheric CO2 mitigation
Grantee:Ana Teresa Lombardi
Support Opportunities: Program for Research on Bioenergy (BIOEN) - Research Partnership for Technological Innovation (PITE)