A Comparative Study on the Bioaccumulation of Cr+3 and Cr+6 by an Emergent Macrophyte Scirpus mucronatus
A laboratory experiment was conducted to examine Cr+3 and Cr+6 uptake capacity of Scirpus mucronatus. The selected macrophytes were transferred to the laboratory containing nutrient solution enriched separately with 1.0, 2.0, 4.0, 8.0 and 16 mg/L of K2Cr2O7 and Cr(NO3)3 and were separately harvested after 2, 4, 6, 8 and 10 days. The bioaccumulation study showed a linear relationship between chromium uptake with the exposure time (2-10 days). The calculated linear regression coefficients (R2) between uptake and exposure time were found to be in the range of 0.577-0.800 and 0.972-0.994 for Cr+6 and Cr+3 respectively. In both the experiments, the concentration of chromium was found to be higher in the roots than the shoots of S. mucronatus. The maximum accumulation, bioconcentration factor (BCF) and translocation factor (TF) value were calculated at 2343.6 µg/g dry weight, 489 and 0.33 for Cr+3 and 1044 µg/g dry weight, 1034 and 0.68 for Cr+6, respectively. S. mucronatus has the ability to accumulate Cr+6 from the surrounding water with a BCF value >102 but poorly translocate Cr+3 and Cr+6 (TF < 1) to the aerial parts.
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