The effect of salinity on the bioaccumulation capacity of lead on green alga Rhizoclonium riparium (Roth) harvey (Chlorophyceae, Cladophorales)
DOI:
https://doi.org/10.17533/udea.acbi.329399Keywords:
accumulation, lead, salinity, seaweed, bioassaysAbstract
Algal bioassays have been used as a practical tool for environmental control of pollution by toxic substances, mainly due to their feasibility in responding to a variety of environmental situations. This study evaluated the capacity of lead (Pb) accumulation by the green alga Rhizoclonium riparium under a set of laboratory conditions. Algal thalli were exposed to lead concentrations (0.1, 1.0, 10, and 15 μg/ml), during a period ranged from 2, 12,24, and 144 hours. The capacity of metal absorption was also examined under a set of salinity conditions (0, 5,15, 30, and 60‰). Metal concentrations were determined by using an atomic absorption spectrophotometer. The highest metal accumulation rates were found at 15‰ of salinity and between 1 and 1.0 μg/ml of lead concentration. Bioaccumulation of lead in algal tissues displayed a linear pattern proportionally with exposure time. These results indicated that accumulation capacity of the green alga is directly influenced by salinity and is a function of metal concentration, and exposure time. Finally, the study suggested that this species could act as indicator of lead concentrations in coastal waters, based on the algal kinetics of lead biosorption.
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