Abstract
The toxic effects and accumulation of the heavy metals, Cd, Cu, and Zn by the sheath forming blue-green alga Chroococcus paris were investigated. All three of the metals were bound rapidly. Approximately 90% of the total amount of the added metal was bound within 1 min. Further significant binding occurred at a slower rate. The maximum metal binding capacity, as determined by filtration studies, was determined to be 53, 120, and 65 mg g−1 dry algal weight for Cd, Cu, and Zn, respectively. Binding curves for the metals followed the Langmuir adsorption isotherm model. The amount of metal bound increased with increasing pH. Metal binding increased significantly when pH was increased from 4 to 7. Nearly all of the metal was found to be rapidly EDTA extractable. Metals were found to be increasingly toxic to growing cultures in the order, Zn, Cd, and Cu. All of the metals studied exhibited toxic effects at concentrations greater than 1.0 mg L−1. The lowest concentrations used which showed detectable toxicity were 0.1 mg L−1 for Cu and >0.4 mg L−1 for Cd and Zn.
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Les, A., Walker, R.W. Toxicity and binding of copper, zinc, and cadmium by the blue-green alga, Chroococcus paris . Water Air Soil Pollut 23, 129–139 (1984). https://doi.org/10.1007/BF00206971
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DOI: https://doi.org/10.1007/BF00206971