Assessing the Phytoremediation Potential of the Grass; Chrysopogon Aciculatus for the Heavy Metals: Cr, Co, Cd, Cu, Pb, Zn, Ni and Mn

Garba, S. T; Baba, A

Authors

Garba, S. T
Baba, A

soil, grass, roots, shoots, environment, pollution, metals, AAS

Abstract

Bioaccumulation ability of the grass Chrysopogon aciculatus for the heavy metals cobalt (Co), manganese(Mn), copper(Cu), lead(Pb), chromium(Cr), cadmium(Cd), nickel(Ni), and zinc( Zn) was studied. Samples of soil and the grass (fresh) were collected from No. 1 Alu avenue off Ahmad Bello way, Nasarawa L. G. A. of Kano State, Nigeria. Collection was made in August to September, 2015. Samples of the grass collected were washed with tap water, carefully separated into roots and shoots, dried at room temperature to a constant weight and grounded. This was then digested using aqua- regia (HNO3 and HCl) in the ratio of 1:3 and analyzed for the said metals using AAS. The soil was equally treated using same reagent and analyzed for same metals. The results indicates that levels, of the metals in the soil, can be arranged in increasing order as; Cd < Cu < Zn < Cr < Ni < Mn with Mn having the highest value of 0.0673ppm whereas Cd had the least value of 0.0025ppm. Similarly the levels of the metals in the root ranged between 0.0023 - 0.0159μg/g. Ni in the root has the highest value of 0.0286 μg/g followed by Zn (0.0159ppm), then Mn 0.0154 μg/g. Cd had the least value of 0.0023μg/g. In the shoot, Mn has the highest value of 0.0185 μg/g followed by Ni 0.0126 μg/g then Cr 0.0105 μg/g. Zinc had 0.0094 μg/g followed by Cu 0.0004 μg/g whereas Cd has the least value of 0.0001μg/g. In all the samples analyzed, Pb and Co were found below detection limit. Mn had the translocation factor (TF) value greater than one (1.20). This shows that the grass plant is capable of absorbing and translocating Mn from the soil to the shoot. Hence the value of Mn 0.0185ppm in the shoot was observed to be the highest of all the metals determined in the grass parts. Chrysopogon aciculatus therefore may have the ability of remediating soil of excess Mn.

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Assessing the Phytoremediation Potential of the Grass; Chrysopogon Aciculatus for the Heavy Metals: Cr, Co, Cd, Cu, Pb, Zn, Ni and Mn. (2016). Global Journal of Science Frontier Research, 16(13), 15-22. https://journalofscience.org/index.php/GJSFR/article/view/

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