Describes a study carried out to evaluate the accumulation of heavy
metals by two different vascular aquatic plants in the artificial
wetlands which were constructed for the treatment of municipal
wastewater in Berlin, Germany. The studied plants were Pharagmites
australis and Schoenoplectus lacustris. The investigated metals were:
Zn, Cr, Cu, Fe, Cd, Ni and Pb. The translocation of such metals in the
plant roots, stems and leaves was also determined. The level of metals
in the influent and effluent of the wastewater, as well as the sludge,
was investigated. The concentration factor of each metal by plants and
sludge was further studied. Results revealed that P. australis has a
higher tendency for the accumulation of metals than S. Lacustris. The
level of metals was higher in roots, followed by leaves, then stems.
Metals were more concentrated in the sludge than in the plants. Further
study showed that the levels of metals in plants grown in the artificial
wetlands were higher than in those grown in a “controlled” area. Concludes
that vascular plants can act as scavengers of metals from the municipal
wastewater while still maintaining a healthy status.