Abstract
Phytoremediation of eight metals in mangrove forests was investigated by focusing on Avicennia marina at three locations along the Egyptian Red Sea coast. Average concentrations of metals in sediment followed the sequence Fe > Mn > Zn > Pb > Cr > Cu > Ni, while Cd was below the detection limit. Metal pollution index and enrichment factor indicated contamination of sediment by Pb, Cu, and Mn. Translocation factors from roots to seeds and leaves were highest for Cd and Mn, respectively, while bioaccumulation factors showed the highest absorptivity of Ni by roots to seeds and leaves organs. The variety in metals mobility and bioaccumilation may be attributed to the physicochemical properties of metals that affect their solubility and bioavailability. Multivariable analysis indicated the contribution of water and sediment characteristics to metal absorption. The study presents that the integrating approach of water, sediment, and plants may be a cornerstone for better recognizing the mangrove environment.
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