COMPARATIVE STUDY OF As, Cr AND Cu ACCUMULATION BY MAIZE (Zea Mays L) AND OKRA (Abelmoschus esculentus) PLANTS IN CCA CONTAMINATED SOIL.
|F.E. Okieimen1*, E.U. Ikhuoria2 and E.G. Uwumarongie-Ilori3
|Corresponding Author: F.E. Okieimen, Tel: +23480 34816279, E-mail: [email protected]|
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Pot experiments were carried out to examine the phytoextraction capacity of maize and okra plants for As, Cr and Cu from poultry manure amended chromated-copper-arsenate (CCA) contaminated soil. The physico-chemical properties of the soil: pH 6.20 ± 0.040; organic matter content 2.15 ± 0.40%; cation exchange capacity 47.86 ± 0.62meq/100g; clay 25%, silt 2% and sand 73% and pseudototal levels of As, Cr and Cu of 32.09 ± 2.48mg.kg-1; 155.82 ± 12.98mg.kg-1 and 265.84 ± 33.0mg.kg-1 respectively classified the soil as moderately-to-highly contaminated sandy loam soil. The contaminated soil samples were treated with various amounts (0, 2, 5, 10 and 20%) of poultry manure (pH 698 ± 0.50; organic matter 5.99 ± 0.11%, cation exchange capacity 10.15 ± 0.60meq/100g); and sown with four viable maize grains and four viable okra seeds in each of the pots. Plants seedlings were harvested 20days after germination and analysed for their As, Cr and Cu contents by AAS. Plant uptake and accumulation levels varied in the order As > Cr > Cu the order of apparent order of relative mobile fractions of the metals, and were generally higher by about an order of magnitude in maize plant than in okra plant. These results indicate the potential for the application of poultry manure in in-place immobilization of heavy metals in contaminated soil of maize plant in the phytoextraction of metals from diffusely contaminated soil.