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Publication Type J
Authors Galfati, I; Bilal, E; Sassi, AB; Abdallah, H; Zaier, A
Author Full Name Galfati, Ines; Bilal, Essaid; Sassi, Aicha Beji; Abdallah, Hassen; Zaier, Ali
Title ACCUMULATION OF HEAVY METALS IN NATIVE PLANTS GROWING NEAR THE PHOSPHATE TREATMENT INDUSTRY, TUNISIA
Source CARPATHIAN JOURNAL OF EARTH AND ENVIRONMENTAL SCIENCES
Language English
Document Type Article
Author Keywords Phosphate mud; Heavy metals; Soils; Plants; Phytoremediation; Gafsa-Metlaoui area; Tunisia
Keywords Plus PHYTOEXTRACTION CAPACITY; CONTAMINATED SOILS; EAST-CARPATHIANS; CADMIUM; ROMANIA; MINE; PHYTOREMEDIATION; ZINC; LEAD; POLLUTION
Abstract The enrichment of the phosphates by a humid process can be accompanied with rejects of mud poured in hydrographic network of the region of Gafsa-Metlaoui to Chott El Gharsa. These releases are rich in phosphate and trace elements; the average is around these values: P2O5: 10.96 %, Cd: 25.83 ppm, Zn: 260.91 ppm, Cr: 387.7 ppm, Cu: 16 ppm, Ni: 26 ppm and Sr: 717.15 ppm. Soils adjoining these rejects present total concentrations in Cd, Zn and Cr higher to the maximal contents tolerated in soils. A two step sequential extraction showed that heavy metals (Cd, Cr, Cu and Ni) were poorly labile (i.e. not soluble in diluted CaCl2), indicating that their leaching under natural conditions is probably very low. However, extraction with DTPA, CaCl2 and TEA generated significant amounts of metals (mainly Cd and Cu), suggesting that they were potentially mobilizable. However, zinc and strontium are more concentrated in the mobile phase, indicating that the Zn-Sr-solutions are possible in natural conditions. This study evaluates the potential for phytoremediation of 30 species collected from six localities, growing on a contaminated site of the study area. Plants and the associated soil samples were collected and analyzed for total metals concentrations. While total metals concentrations in soils vary from 1 to 36 ppm Cd, 1.6 to 2463 ppm Zn, 8.5 to 442 ppm Cr, 2.8 to 38.5 ppm Cu, 1 to 31.7 ppm Ni and 144.6 to 1310 ppm Sr, while those in the plants ranged from 0.11 to 82 ppm Cd, 0.5 to 567 ppm Zn, 0.04 to 174.7 ppm Cr, 0.95 to 51.73 ppm Cu, 0.17 to 6.9 ppm Ni and 6 ppm to 2858 ppm Sr. None of the plants were suitable for phytoextraction because no hyperaccumulator was identified. However, plants with a high bioconcentration factor (BCF, metal concentration ratio of plant roots to soil) and low translocation factor (TF, metal concentration ratio of plant leaves to roots) have the potential for phytostabilization. The plants most effective in the accumulation of metals in leaves are Malva aegyptiaca (TF=30.7) for Cd, Frankenia thymifolia (TF=8.55) for Zn, Peganum harmala (TF=29.14) for Cu and Citrulus sp (TF=10.42) for Sr. Anthemis stiparum was most suitable for phytostabilization of contaminated sites with Cd (BCF=23.51). Our study showed that native plant species growing on contaminated sites may have the potential for phytoremediation.
Author Address [Galfati, Ines; Sassi, Aicha Beji; Zaier, Ali] Campus Univ, Dept Geol, Fac Sci, Tunis 1060, Tunisia; [Galfati, Ines; Abdallah, Hassen] Technopk Borj Cedria Univ Carthage, Ctr Res & Technol Energy, Hammam Lif 2050, Tunisia; [Bilal, Essaid] Ecole Natl Super Mines, CNRS, UMR6425, F-42023 St Etienne, France
Reprint Address Galfati, I (reprint author), Campus Univ, Dept Geol, Fac Sci, Tunis 1060, Tunisia.
E-mail Address ines_galfati@yahoo.fr; bilal@emse.fr; Hassen.Abdallah@inrst.rnrt.tn
Funding Agency and Grant Number GENERIC department of SPIN division of Ecole Nationale Superieure des Mines de Saint Etienne, France; The Department of Geology of the Faculty of Sciences, Tunis, University El Manar; Laboratory of Geo-power of Power Technology Research Centre
Funding Text This work was supported by GENERIC department of SPIN division of Ecole Nationale Superieure des Mines de Saint Etienne, France; The Department of Geology of the Faculty of Sciences, Tunis, University El Manar, and the Laboratory of Geo-power of Power Technology Research Centre. The authors wish to thank Olivier Faure and Esteban Remon, Laboratory of Echophysiology Applied Sciences, Faculty of the Jean Monnet, Saint-Etienne, for their assistance.
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Cited Reference Count 52
Times Cited 17
Total Times Cited Count (WoS, BCI, and CSCD) 17
Publisher NORTH UNIV BAIA MARE
Publisher City BAIA MARE
Publisher Address FACULTY MINERAL RESOURCES & ENVIRONMENT, DR VICTOR BABES 62-A,, BAIA MARE, 430083, ROMANIA
ISSN 1842-4090
29-Character Source Abbreviation CARPATH J EARTH ENV
ISO Source Abbreviation Carpath. J. Earth Environ. Sci.
Publication Date SEP
Year Published 2011
Volume 6
Issue 2
Beginning Page 85
Ending Page 100
Page Count 16
Web of Science Category Environmental Sciences
Subject Category Environmental Sciences & Ecology
Document Delivery Number 833TH
Unique Article Identifier WOS:000295907300009
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