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
Related Articles
- EP ID EP414078
- DOI 10.9790/5736-1106014451.
- Views 183
- Downloads 0
Adsorption of Malachite Green Using Activated Carbon From Copper Pod
In the present study, the adsorption capacity of waste materials of copper pod fruit was determined for the removal of malachite green dye from aqueous solutions. This batch adsorption experiment was carried out to study...
Oxidative Cleavage of Glycine with N-Chlorobenzimidazole in Aqueous Acetic Acid Medium
The oxidative cleavage of glycine with N-chlorobenzimidazole (CBI) has been studied in aqueous acetic acid medium. The rate shows first order dependence each on [CBI] and [glycine] and inverse first order on [H+ ]. The r...
Electrochemical degradation of a real silk textile wastewater using iron electrodes
The electrochemical degradation of a raw real silk textile wastewater was carried out using iron electrodes in bipolar arrangement to remove chemical oxygen demand (COD), color and to reclaim clean water. Batch studies w...
Glycosylation of the Pyrrolopyrimdine and Its Cyclisation into Tricyclic Nucleoside for Incorporation into Synthetic DNA
Alkylation of DNA is commonly used during cancer chemotherapy. The most common chemotherapeutic agents are those that alkylate the O 6 -position of guanine. Attempts were made in the modification of the O6-position of gu...
Ultra Violet Spectra of N-Hydroxy Amidines
Hydroxyamide Hydrochloride was prepared by condensation of N (4- Fluoro) benzamidoyl chloride and N- phenyl hydroxylamine at 00 -5 0C in ether medium. White crystals of N-HydroxyN- phenyl benzamidine hydrochloride were s...