Phytoremediation Potential of SENNA OCCIDENTALIS to remove Heavy metals from waste soil in Makurdi, Nigeria

This paper is aim to investigate the capacity of plant ( Senna occidentalis ) to remove contaminant in waste soil polluted by various heavy metals. The phytoextraction of Cd, Cu, Ni, Pb, Zn from waste dumpsite using Link plant ( Senna occidentalis ) was investigated under natural phytoextraction (NPE), chelant-assisted phytoextraction (CPE), Poultry manure-assisted phytoextraction (PMPE). Link plants were grown for 8 weeks in soils receiving: no treatment/amendments as NPE, citric acid (0.05 - 2.0 mmol) and EDTA (0.05 - 2.0 mmol) amendments as CPE, Poultry Manure (2.0 - 10.0 % w/w) as PMPE. Post-harvest roots and shoots biomass (g) were 51.29 and 93.33 for NPE, (EDTA) ranged from 23.58 - 39.36 and 66.78 - 83.14, MPE ranged from 49.95 - 87.75 and 95.14 - 170.18. The percentage metal extractability in the various scenario followed the order, NPE; Ni > Cd > Zn > Cu > Pb, CPE (EDTA): Zn > Pb> Cd> Ni > Cu, The BCF and TF was calculated for tissue metal concentrations, NPE showed that BCF for all metals were 1 while Cu, Pb and Zn were 1 for Cd (1.23, 1.20, 1.54 and 1.11) Cd (1.30 and 1.07) and Zn( 2.33 and 1.91) while Ni and Pb were all  <1. In general, S.occidentalis was capable of taking up all the Heavy metals under study, accumulating and adequately translocating them to the aboveground harvestable biomass provided the necessary soil amendment is done. Keywords : Example ( S.occidentalis, Phytorediation, Heavy metal and Natural Phytoextraction) DOI : 10.7176/CMR/11-4-05 Publication date : April 30 th 2019