Binding of Cu(II) to the surface and exudates of the alga Dunaliella tertiolecta in seawater

Article Abstract:

The binding of copper ions (Cu2+) to the cell surfaces of the marine alga Dunaliella tertiolecta and to organic matter excreted by the alga in seawater was examined as a function of salinity, pH and temperature. The results showed that the rate of Cu2+ uptake occur in two steps, which correlates with high- and low-affinity binding sites on the algal surface. High-affinity binding constant had the same order of magnitude as the binding capacity of algal exudates. Changes in salinity, pH and temperature caused changes in Cu2 adsorption and amount Cu2+ in complexed form.

Environmental aspects, Bioaccumulation, Copper ions, Marine phytoplankton

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Rates and mechanism of Fe(II) oxidation at nanomolar total iron concentrations

Article Abstract:

The rates and mechanism of Fe(II) oxidation at nanomolar total iron concentrations were investigated using an automated luminol-based chemiluminescence system. The results showed that O2- and OH intermediaries produced by Fe(II) oxidation are also effective oxidants under controlled conditions. Concentration increased exponentially along with the pH, suggesting that substantial concentrations of H2O2 and O2- should be present at the oxic-anoxic interface.

Oxidation-reduction reaction, Oxidation-reduction reactions, Iron, Iron (Metal)

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Adsorption of phosphate on manganese dioxide in seawater

Article Abstract:

The adsorption of phosphate on manganese dioxide in ash solutions and seawater was investigated to determine the effect of pH, salinity, seawater ions and humic acid on the adsorption process. The results indicated that manganese oxides act as important adsorbents of phosphate in natural waters when they are present at higher concentrations than other reactive constituents.

Phosphates, Manganese, Manganese (Metal), Adsorption, Sea-water, Seawater

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