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Spirulina (Arthrospira) platensis, a blue-green photoautotrophic alga has widely been used for the production of high valued protein for human and animal feeding as well. The present study focused on bioaccumulation of Pb2+ and its effects on growth of S . platensis . The species was cultured in Zarrouk liquid medium with different concentrations of Pb 2+ (1, 2, 3, 4 and 5 μg/mL) and incubated for ten days under optimal conditions. Accumulated amount of Pb 2+ increased with increasing Pb 2+ concentrations (1.218, 2.254, 2.673, 3.713 and 5.173 mg/g dry weight, respectively for 1, 2, 3, 4 and 5 μg/mL of Pb2+, at 2 days of incubation) and decreased as incubation progressed. Bioconcentration factor (BCF) also reached to the peak (1218, 1127, 888, 928 and 1035 for 1, 2, 3, 4 and 5 μg/mL of Pb 2+ respectively) at 2 days of incubation followed by a gradual reduction. No marked differences were found in growth measured as optical density at 560 nm. It could therefore be concluded that no remarkable inhibition on growth of S . platensis is shown when cultured in contaminated water with low concentrations of Pb 2+ . Furthermore, the species sounds potential accumulator of Pb 2+ and thus could be used in detoxifying heavy metal affected aquatic ecosystems. Key words: bioaccumulation; bioconcentration factor; Pb 2+ ; Spirulina platensis DOI: 10.4038/tare.v10i0.1870 Tropical Agricultural Research & Extension Vol.10 2007 47-52

How Does Lead (Pb<sup>2+</sup>) at Low Concentrations Affect on <i>Spirulina (Arthrospira) platensis</i>