Similar results were obtained by Kamal et al. (2004), evaluating
the capacity of three aquatic plants on heavy metal removal from
contaminated waters. The experiment lasted for 21 days and the
departure mercury concentration was 0.501 mg L1. The efficiencies
obtained in these three systems cultivated respectively with
Myriophylhum aquaticum, Ludwigina palustris and Mentha aquatic,
were 99.97%, 99.74% and 99.99%.