Please use this identifier to cite or link to this item: http://hdl.handle.net/10553/49838
Title: Binding of Cu(II) to the Surface and Exudates of the Alga Dunaliella tertiolecta in Seawater
Authors: Gonzalez-Davila, Melchor 
Magdalena Santana-Casiano, J. 
Perez-Peña, Jesus 
Millero, Frank J.
UNESCO Clasification: 251002 Oceanografía química
230331 Química del agua
Keywords: Diatom Thalassiosira-Weissflogii
Anodic-Stripping Voltammetry
Copper Complexing Capacity
Phaeodactylum-Tricornutum
Marine-Phytoplankton, et al
Issue Date: 1995
Publisher: 0013-936X
Journal: Environmental science & technology 
Abstract: The adsorption process and the organic matter interaction between the marine phytoplankton specie Dunaliella tertiolecta and copper ions were investigated by differential pulse anodic stripping voltammetry. The rate of uptake was found to occur in two steps. The adsorption equilibrium data correlate well with a two-site model which considers the algal surface as one which possesses two major functional groups: high-affinity binding and low-affinity binding. The high-affinity constant was of the same order of magnitude as the complexing capacity of the exudates excreted by the algae, showing that extracellular ligands play an important role in decreasing the concentration of the free metal concentration. Changes in the temperature, salinity, and pH of the seawater solution modified both the adsorption of metal and the amount of complexed copper.
URI: http://hdl.handle.net/10553/49838
ISSN: 0013-936X
DOI: 10.1021/es00002a004
Source: Environmental Science and Technology [ISSN 0013-936X], v. 29, p. 289-301
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