Short-term dynamic change of gill copper in common carp, Cyprinus carpio, evaluated by a sequential extraction
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AbstractDynamic changes in Cu speciation and its binding to fish gills were investigated by exposing common carp (Cyprinus carpio) to a 1 mg/1 Cu solution for 7 hours. Cu speciation in the bulk solution and fish gill microenvironment was calculated using general chemical equilibrium modeling. A sequential extraction procedure using distilled water, magnesium dichloride (1.0 mol/1), and acetic acid (10%) was used to characterize the Cu associated with the fish gills. Cu residual in the gill tissue was measured after the sequential extraction. Changes in total Cu concentration, pH, and dissolved organic carbon (Doc) in the bulk solution were recorded during the experimental period and calculated for the fish gill microenvironment. Cu-hydroxide species and Cu were dominant Cu species in both bulk solution and the fish gill microenvironment, whereas increased Cu-mucus was found in the fish gill microenvironment. DOC in the exposure medium, assumed to arise from mucus release, also increased and complexed Cu in solution. Forty-three percent of the Cu associated with the gills was readily water extractable, with an additional 22% exchangeable with Mg(2+) or protons. Only 35% of the Cu accumulated within the gill tissues. The binding of Cu to the fish gills reached apparent equilibrium after 3 hours of exposure. Furthermore, the amount of water-extractable Cu within the gills showed significant correlation to the concentration of Cu predicted to be complexed with calculated free mucus in the gill microenvironment.
All Author(s) ListTao S, Liu WX, Liu GJ, Dawson R, Cao J, Wong PK
Journal nameArchives of Environmental Contamination and Toxicology
Volume Number51
Issue Number3
PublisherSpringer Verlag (Germany)
Pages408 - 415
LanguagesEnglish-United Kingdom
Web of Science Subject CategoriesEnvironmental Sciences; ENVIRONMENTAL SCIENCES; Environmental Sciences & Ecology; Toxicology; TOXICOLOGY

Last updated on 2021-01-05 at 02:03