Field-based investigation on phytoremediation potentials of Lemna minor and Azolla filiculoides in tropical,semiarid regions: Case of Ethiopia |
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| Authors: | Elfu Amare Fassil Kebede Tesfay Berihu Worku Mulat |
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| Affiliation: | 1. School of Mechanical and Industrial Engineering, Ethiopian Institute of Technology, Mekelle University, Mekelle, Ethiopiaelfua12@yahoo.com!["ORCID]("/templates/jsp/images/orcid.png" "\"ORCID") http://orcid.org/0000-0003-4576-5376;2. Ethiopian Environment and Forest Research Institute, Addis Ababa, Ethiopia;3. Land Resources Management and Environmental Protection Department, College of Dryland Agriculture and Natural Resources, Mekelle University, Mekelle, Ethiopiahttp://orcid.org/0000-0002-6086-0948;4. Civil and Environmental Engineering Department, University of Connecticut, Storrs, USA |
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| Abstract: | This study investigated the concurrent accumulation of eight heavy metals by two floating aquatic macrophytes (Lemna minor and Azolla filiculoides) cultivated in ambient media and blended wastewaters in the semiarid regions of Ethiopia. Both species accumulated heavy metals in varying degrees with a significant concentration gradient within the immediate water media. Highest bioconcentration factor (BCF) was determined for Mn and Fe in both plants. Results revealed that L. minor was high phytoaccumulator for Fe, Mn, Zn, and Co but moderate for Cd, Cu, Ni, and Cr. On the other hand, A. filiculoides was a high accumulator for Fe, Mn, Zn, and Cu, but its potency was moderate for Co, Cr, and Ni, but lower for Cd. Both species exhibited significant difference in accumulating Co, Zn, and Mn (p < 0.05). In general, the BCFs for both plants were comparable within the same treatment. In this study, stronger associations between the heavy metal concentrations in the plant tissues and in the grown water media were observed for A. filiculoides. |
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| Keywords: | Azolla filiculoides bioconcentration Heavy metal Lemna minor phytoremediation |
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