Enhanced phytoextraction of chromium by the aquatic macrophyte Potamogeton pusillus in presence of copper

The aquatic macrophyte, Potamogeton pusillus was evaluated for the removal of Cu2+ and Cr+6 from aqueous solutions during 15 days phytoextraction experiments. Results show that P. pusillus is capable of accumulating substantial amount of Cu and Cr from individual solutions (either Cu2+ or Cr+6). Significant correlations between metal removal and bioaccumulation were obtained. Roots and leaves accumulated the highest amount of Cu and Cr followed by stems. The bioaccumulation of Cr was significantly enhanced in the presence of Cu, showing a synergic effect on Cr+6 removal, presenting a good alternative for the removal of these metals from polluted aquifers. To the extent of our knowledge, this is the first report on both enhanced phytoextraction of Cr+6 in presence of Cu+2 and bioaccumulation of these heavy metals by P. pusillus. - Highlights: ► First report on enhanced phytoextraction of Cr+6 in the presence of Cu+2 by P. pusillus. ► P. pusillus can be a good candidate for phytoremediation of contaminated water bodies. ► Roots and leaves presented higher accumulation, suggesting that they are in charge of metal uptake. - We report enhanced effect of Cu+2 upon phytoextraction of Cr+6 by Potamogeton pusillus from water. Metals accumulation occurs mainly in roots and leaves of this aquatic plant.