Comparative phytoremediating potentials of Jatropha curcas, Ixora coceinea, Codiaeum variagatum, Andropogum tectorium, Panicum maximum, Zea mays, Cajanus cajan FOR Pb2+, Cd2+, Zn2+ AND Co2+
DOI:
https://doi.org/10.13171/mjc02501291766anaradoAbstract
The emergence of the industrial revolution has led to an enormous increase in heavy metal pollution of the biosphere which subsequently became a threat to the environment and human life. Heavy metal pollution has been recognised as one of the most critical threats to soil and water resources, together with human health. The potential of Jatropha curcas, Ixora coceinea, Codiaeum variagatum(male and female), Andropogum tectorium, Panicum maximum, Zea mays and Cajanus cajan as suitable phytoremediators for soil matrix polluted with Zinc (Zn), Cobalt (Co), Cadmium (Cd) and Lead (Pb) at 0.1M and 0.5M concentrations, and at 8 and 12 weeks of inoculation is the aim of this work.The plants were grown in soils polluted with 0.1m and 0.5M solutions of Pb2+, Cd2+, Co2+ and Zn2+, harvested after 8 and 12 weeks of inoculation. They were washed, air-dried, ashed, digested and concentrations of the metal ions in the plants were analysed. The results showed that there were significant interaction effects between the plants and the concentration of metal ions in the absorption of Pb2+(P< 0.01), Cd2+(P< 0.01), Co2+ (P< 0.01) and Zn2+ (P< 0.001). There was also significant interaction effects plants and the time of harvest in absorption of Pb2+(P< 0.01), Cd2+(P= 0.02) and Zn2+ (P< 0.001). No significant interaction was observed for absorption of Co (P= 0.36). At 0.5M concentration of Pb2+ and Cd2+, the mean Pb2+ and Cd2+absorptions in Codiaeum variagatum (female) were significantly higher than those of other plants. Also Ixora coceinea had the highest mean absorption of Co2+ when inoculated with 0.5M of the metal ion and at 8 weeks. While the mean Zn2+ absorption in Codiaeum variagatum (male) was significantly than those of other plants when inoculated with 0.5M Zn2+ and at 12 weeks. The flowering plants- Codiaeum variagatum (male and female) and Ixora coceinea showed better absorption of the metal ions than all other plants. These potentials shown by the flowering plants indicated that the plants could serve both aesthetic and phytoremediating functions at the same time.
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