A study was designed to assess the phytoextraction potential of Glycine max L. for lead (Pb). Pots experiment was conducted. Viable seeds were planted in 5 kg of soil placed in each plastic pot having 0 ppm (control), 5 ppm, 10 ppm, 15 ppm, 20 ppm and 25 ppm of Pb respectively. The study was carried out for a period of 12 weeks under natural conditions. Physicochemical properties of the soil were determined using standard methods. The results revealed that pH, phosphorous and moisture contents increased while nitrogen and organic carbon contents decreased in polluted soil remediated with Glycine max L. compared to the unpolluted soil. Leaf, stem, seeds and roots of the plant were analyzed for Pb uptake after 12 weeks. The plants mopped up substantial concentration of Pb in the above plant biomass of the seeds (4.2 mg/kg), stem (1.37 mg/kg) and leaves (3.37 mg/kg) compared to concentrations in the roots (1.53 mg/kg). The phytoextraction ability of the plant was assessed in terms of its bioconcentration factor (BCF) and translocation factor (TF). It was observed that the levels of Pb in the roots and shoots after 12 weeks showed that more bioavailable pool of Pb was translocated from the root to seeds, leaves and stem in that order. The results obtained suggest that the plant has phytoextraction ability and could be used in restoring soil polluted with Pb.
[Show abstract][Hide abstract] ABSTRACT: Phytoremediation is emerging as a potential cost-effective solution for the remediation of contaminated soils. Because contaminants such as lead (Pb) have limited bioavailability in the soil, a means of solubilizing the Pb in the soil and facilitating its transport to the shoots of plants is vital to the success of phytoremediation. Indian mustard (Brassica juncea) was used to demonstrate the capability of plants to accumulate high tissue concentrations of Pb when grown in Pb-contaminated soil. Concentrations of 1.5% Pb in the shoots of B. juncea were obtained from soils containing 600 mg of Pb/kg amended with synthetic chelates such as EDTA. The accumulation of Pb in the tissue corresponded to the concentration of Pb in the soil and the concentration of EDTA added to the soil. The accumulation of Cd, Cu, Ni, and Zn from contaminated soil amended with EDTA and other synthetic chelators was also demonstrated. The research indicates that the accumulation of metal in the shoots of B. juncea can be enhanced through the application of synthetic chelates to the soil, facilitating high biomass accumulation as well as metal uptake.
[Show abstract][Hide abstract] ABSTRACT: A process has been developed for the remediation of heavy metal contaminated, fine textured; solid wastes so that the treated material will meet EPA's TCLP and Total Extractable Metal Limits. The process involves the formation of strong aggregates using dry agglomeration methods. Remediation is achieved either by incorporating metal fixation agents into the agglomerates, or by leaching of heavy metal and other soluble salts by percolation through a packed bed of agglomerated soil. The handling problems encountered during solid liquid separations in conventional soil washing are overcome by agglomerating the fine textured solids. The newly developed process was applied to the remediation of a fine textured soil sample from a Dupont site contaminated with lead and a sediment from the Coeur d'Alene river, contaminated with Pb, Cd, and Zn. Because of low hydraulic flow-rates leaching of metals from unagglomerated solids was slow. The removal of metals from agglomerated feed occurred on the time scale of hours compared to days for the original materials, Batch column extraction studies showed that HCl, EDTA and citric acid were effective extractants for the removal of lead from the agglomerated material. The results of this study demonstrate that NRC's remediation process is suitable for the remediation of contaminated soil or soil like materials and has potential for commercialization. Crown Copyright
[Show abstract][Hide abstract] ABSTRACT: This study investigated the prevalence of elevated blood lead (PbB) levels in children 1–6 years old in Kaduna, a medium size city in northern Nigeria. Mean PbB was found to be 10.6 μg/dl, and 2% of the children had PbB levels greater than 30 μg/dl. Highest average PbB levels were found in children 5 years old and was attributed to the tendency for this age group to play longer in contaminated outdoor environments. The strongest associations were found between PbB and whether the family owned a car or lived in a house on a tarred road. Potential sources of lead in the city as well as household and behavior risk factors likely to result in exposure of children to lead are discussed. This study provides additional data pointing to childhood lead poisoning as being a major public health problem in urban areas of Africa.
Science of The Total Environment 05/1997; 197(1-3-197):13-19. DOI:10.1016/S0048-9697(96)05408-3 · 4.10 Impact Factor
Data provided are for informational purposes only. Although carefully collected, accuracy cannot be guaranteed. The impact factor represents a rough estimation of the journal's impact factor and does not reflect the actual current impact factor. Publisher conditions are provided by RoMEO. Differing provisions from the publisher's actual policy or licence agreement may be applicable.