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In this study, wetland species growing naturally in the surrounding of two   crude oil facilities were sampled and screened for their phytoremediation   potentials for zinc, lead, nickel, chromium and cadmium in soil.   Concentrations of metals in the root and shoot samples of the wetland species   alongside the rhizosphere soil were determined. Metal accumulation in wetland   species exceeded the permissible limits, but it was still within phytotoxic   thresholds except for chromium. The use of a bioconcentration factor and a   transfer factor to screen the wetland species for phytoremediation potentials   identified six out of the eight studied species as multi-elemental   phytostabilizers of metals in soil. In addition, five of the eight wetland   species displayed potentials for phytoextraction of metal, though there was   no multi-elemental phytoextractor among the wetland species. Paspalum   vaginatum, Andropogon tectorum and Kyllinga squamata portend potential   abilities to phytoextract nickel. In addition, Setaria longiseta and   Pteridium aquilinum also showed strong potential to phytoextract lead and   cadmium respectively from soil. This screening assessment is hoped to be   useful in the applications of a cost-effective green technology to remediate   heavy metals in contaminated soil

journal of agricultural sciences

Transfer of metals from crude oil impacted soils to some native wetland species, the Niger-delta, Nigeria: Implications for phytoremediation potentials