Chemical Speciation of Selected Heavy Metals In Roadside Soils At Intersections And Terminuses In Harare, Zimbabwe
Journal Title: IOSR Journal of Applied Chemistry (IOSR-JAC) - Year 2018, Vol 11, Issue 6
Abstract
Sequential extraction technique was applied for the speciation and evaluation of the bioavailability of trace heavy metals in the roadside soil of major highways and terminuses in Harare, Zimbabwe. Heavy metals studied are Cd, Pb, Zn, Cu, Cr, Fe, Ni and Mn. Analysis of these metals was done using the AAS. Results obtained from the sequential extraction technique were compared with the results obtained from aqua regia digestion and Canadian soil quality guidelines. Recoveries were found to be relatively good except for lead which was on the lower side. Speciation species were grouped into non-resistant and resistant fractions. Cd, Pb, Zn, Cu and Mn were found mostly in the non-resistant fraction that is potentially bioavailable to human beings. Fe, Cr and Ni on the other hand were mostly abundant in the more bound crystalline lattice. Results of the analysis indicate that Cd, Pb and Zn did not exceed the maximum permissible limits at all the sites while Cr exceeded the maximum limit at all sites. Ni and Cu exceeded the maximum permissible limits at some of the sites. Speciation of Cd, Cu and Ni was in the order residue > organic > carbonates > exchangeable > oxides of Fe-Mn.
Authors and Affiliations
Thulani Ndhlovu, Cleopus Machingauta
Keywords
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- EP ID EP414078
- DOI 10.9790/5736-1106014451.
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