In the Vromos Bay area, Southeastern Bulgaria, near the Black Sea coast, drainage waters from flotation tailings ponds and piles of low-grade polymetallic ores are heavily contaminated with redioactive elements (U, Ra, Th) and some toxic heavy metals (mainly Cu, Cd, Pb, Mn). Some of these waters were treated by a natural wetland characterized by a plant community in which Phragmites communis was the dominant species. Different species of Scirpus, Juncus, Carex and Poa as well as some algae were also present. However, Typha latifolia nd Typha angustifolia were very rare and were present as single plants in this wetland.
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