Phytoremediation of heavy metals by Eichhornia crassipes

Victor J. Odjegba () and Ishola O. Fasidi
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Victor J. Odjegba: University of Lagos
Ishola O. Fasidi: University of Ibadan

Environment Systems and Decisions, 2007, vol. 27, issue 3, 349-355

Abstract: Abstract Eichhornia crassipes was tested for its ability to bioconcentrate 8 toxic metals (Ag, Cd, Cr, Cu, Hg, Ni, Pb, and Zn) commonly found in wastewater from industries. Young plants of equal size were grown hydroponically and amended with 0, 0.1, 0.3, 0.5, 1.0, 3.0, and 5.0 mM of each heavy metal individually for 21 days. The test plant had the lowest and the highest tolerance indices for Hg and Zn, respectively. A significant (P ≤ .05) reduction in biomass production was observed in metal treated plants compared with the control. All strace elements accumulated to higher concentrations in roots than in shoots. Trace element concentrations in tissues and the bioconcentration factors (BCF) were proportional to the initial concentration of individual metal in the growth medium and the duration of exposure. From a phytoremediation perspective, E. crassipes is a promising plant species for remediation of natural water bodies and/or wastewater polluted with low levels of Zn, Cr, Cu, Cd, Pb, Ag and Ni.

Keywords: Heavy metals; Bioconcentration; Pollution; Eichhornia crassipes (search for similar items in EconPapers)
Date: 2007
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DOI: 10.1007/s10669-007-9047-2

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