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Environ Sci Pollut Res Int. 2017 Aug;24(22):18295-18308. doi: 10.1007/s11356-017-9464-9. Epub 2017 Jun 21.

Phytoextraction of Pb, Cr, Ni, and Zn using the aquatic plant Limnobium laevigatum and its potential use in the treatment of wastewater.

Author information

1
Multidisciplinary Institute of Plant Biology (IMBIV), CONICET and Faculty of Exact, Physical and Natural Sciences, National University of Córdoba, Av. Vélez Sarsfield 1611, Ciudad Universitaria (X5016GCA), Cordoba, Argentina.
2
Multidisciplinary Institute of Plant Biology (IMBIV), CONICET and Faculty of Exact, Physical and Natural Sciences, National University of Córdoba, Av. Vélez Sarsfield 1611, Ciudad Universitaria (X5016GCA), Cordoba, Argentina. c_harguinteguy@unc.edu.ar.
3
Research Institute on Animal Production (INPA) UBA-CONICET, The Center and Institute for Transdisciplinary Water Studies (CETA) and Faculty of Veterinary Sciences of the University of Buenos Aires, Av. Chorroarín 280 (C1427CWO), Buenos Aires, Argentina.

Abstract

In order to study the bioaccumulation of Pb, Cr, Ni, and Zn and the stress response, the floating aquatic plant Limnobium laevigatum was exposed to increasing concentrations of a mixture of these metals for 28 days, and its potential use in the treatment of wastewater was evaluated. The metal concentrations of the treatment 1 (T1) were Pb 1 μg L-1, Cr 4 μg L-1, Ni 25 μg L-1, and Zn 30 μg L-1; of treatment 2 (T2) were Pb 70 μg L-1, Cr 70 μg L-1, Ni 70 μg L-1, and Zn 70 μg L-1; and of treatment 3 (T3) were Pb 1000 μg L-1, Cr 1000 μg L-1, Ni 500 μg L-1, and Zn 100 μg L-1, and there was also a control group (without added metal). The accumulation of Pb, Cr, Ni, and Zn in roots was higher than in leaves of L. laevigatum, and the bioconcentration factor revealed that the concentrations of Ni and Zn in the leaf and root exceeded by over a thousand times the concentrations of those in the culture medium (2000 in leaf and 6800 in root for Ni; 3300 in leaf and 11,500 in root for Zn). Thus, this species can be considered as a hyperaccumulator of these metals. In general, the changes observed in the morphological and physiological parameters and the formation of products of lipid peroxidation of membranes during the exposure to moderate concentrations (T2) of the mixture of metals did not cause harmful effects to the survival of the species within the first 14 days of exposure. Taking into account the accumulation capacity and tolerance to heavy metals, L. laevigatum is suitable for phytoremediation in aquatic environments contaminated with moderated concentrations of Cr, Ni, Pb, and Zn in the early stages of exposure.

KEYWORDS:

Bioaccumulation; Floating macrophyte; Heavy metals; Limnobium laevigatum; Phytoextraction; Tolerance

PMID:
28639015
DOI:
10.1007/s11356-017-9464-9
[Indexed for MEDLINE]

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