Heavy Metals Speciation of Soil from Automobile Mechanic Workshops in Oshogbo Metropolis, South Western Nigeria
[1]
Olusola Adelowotan, Department of Chemistry, Obafemi Awolowo University, Ile-Ife, Nigeria.
[2]
Iyabo Oluremi Olabanji, Department of Chemistry, Obafemi Awolowo University, Ile-Ife, Nigeria.
[3]
Oladotun Wasiu Makinde, Centre for Energy Research and Development, Obafemi Awolowo University, Ile-Ife, Nigeria.
[4]
Emmanuel Ayodele Oluyemi, Department of Chemistry, Obafemi Awolowo University, Ile-Ife, Nigeria.
Heavy metals speciation of soils around automobile mechanic workshops in Oshogbo metropolis were carried out in order to access the effects of indiscriminate disposal of used oil and scraps on the soil environment. Soil samples were collected at two different depths of 0–15 cm and 15–30 cm from four different automobile workshops. The air–dried samples were pulverized and subjected to four–stage sequential extraction procedure for the determination of six heavy metals in the sample. The speciation results at 0–15 cm soil depth indicated significant amount of Cd and Zn were associated with the exchangeable and bound to carbonate fraction. Cu and Pb were prevalently held in the Fe–Mn oxide fraction. At 15–30 cm soil depth, predominate form of Cu, Pb and Zn existed in the Fe–Mn oxide fraction, and significant amount of Cd was associated with organic matter fraction. Cr and Ni were prevalently held in the residual fraction at both depths. The study concluded that the soils at the four auto-mobile mechanic workshops were polluted.
Heavy Metals, Speciation, Contamination Index, Geoaccumulation Index
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