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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/12571

Title: Distribution and ecological risks of toxic metals in the topsoils in the Kumasi metropolis, Ghana
Authors: Darko, Godfred
Dodd, Matt
Nkansah, Marian Asantewah
Aduse-Poku, Yaw
Borquaye, Lawrence Sheringham
et. al
Keywords: soil contamination
urban soil
toxic heavy metals
Issue Date: 14-Jul-2017
Publisher: Cogent Environmental Science
Citation: Darko et al., Cogent Environmental Science (2017), 3: 1354965. Distribution and ecological risks of toxic metals in the topsoils in the Kumasi metropolis, Ghana. https://doi.org/10.1080/23311843.2017.1354965
Abstract: Abstract: The distribution, and ecological risks due to toxic metals in topsoils of an urban commercial centre of Kumasi metropolis were determined. Concentrations of heavy metals in the samples were initially screened using field portable X-ray fluorescence spectrometer prior to confirmation on an inductively coupled plasmamass spectrometer. The results from the two instruments correlated well with high linearity (R2  > 0.70). Concentrations of metals were in the order: Fe (45246.15 mg/ kg) > Mn (347.86 mg/kg) > Zn (176.40 mg/kg) > V (173.10 mg/kg) > Cr (125.12 mg/ kg) > Pb (53.47 mg/kg) > Ni (43.16 mg/kg) > Cu (39.85 mg/kg) > As (4.59 mg/ kg) > Sn (3.69 mg/kg) > Cd (0.46 mg/kg) > Hg (0.28 mg/kg). Multivariate and geostatistical analyses exploring various hazard indices such as geo-accumulation, contamination, pollution load and ecological risks all suggest contamination of the topsoils with toxic metals and that the contamination due to Pb, Cu, Ni, Cr and Zn is mainly derived from anthropogenic origins whereas, As, Hg, Mn, V, Sn and Cd contaminations are attributable mainly to geological and atmospheric depositions. Contamination factor (CF) suggests that the topsoils were considerably contaminated (CF 3–6) with Zn, moderately contaminated (CF 1–3) with Ni, Hg, V, Sn and Cd and least contaminated (CF <1) with As, Pb, Cu, Cr and Mn. In general, the soils were found to be moderately contaminated (average contamination factor (1 ≤CF <3) with toxic metals and may pose both human and ecological risks.
Description: An article published by Cogent Environmental Science and also available at https://doi.org/10.1080/23311843.2017.135496
URI: http://hdl.handle.net/123456789/12571
Appears in Collections:College of Science

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