Geosciences-Scholarly Publications

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Browsing Geosciences-Scholarly Publications by Author "Adekitan, A.A."

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  • Item
    Open Access
    Assessment of Heavy Metals Leaching in Groundwater of Industrial Areas of Nigeria
    (2015) Ojekunle, Z.O.; Rasak, A.M.; Mustapha, D.Z.; Ojekunle, V.O.; Sangowusi, R.O.; Oyebanji, F.F.; Adekitan, A.A.; Odjegba
    Pollution of ground water with heavy metals from industrial activities has caused a major threat to human life exposing man to series of diseases, crippling disability and death. This study was carried out to determine the concentration of heavy metals leaching into groundwater from the industrial activities and to assess their long term effect on life of the people and the resultant aquifer. The study was carried out at 10 different locations which are all located in Ikeja industrial areas. The water samples collected were subjected to physical, chemical, heavy metal and bacteriological analysis in order to determine their level of pollution. Samples were prepared according to the standard methods using atomic absorption spectrophotometry for heavy metals determination. The result of the analysis shows that heavy metals in water samples had an average pH mean value of 5.20 indicating the acidity of the water sampled, while the average electrical conductivity, temperature and total acidity of were 0.64µs/cm 29.70 o C and 29.60 respectively. The average mean concentration of the chemical and heavy metals were 0.132 mg/l, 0.040 mg/l, 0.279 mg/l, 0.148 mg/l, 0.026 mg/l, 0.0055 mg/l, 0.00266 mg/l and 0.0097 mg/l for calcium, magnesium, sodium, potassium, iron, cadmium, lead, and chromium respectively. The parameters analysed were at varying concentrations in the groundwater with parameters such as nitrate, phosphate, and pH exceeding the World Health Organization (W.H.O) standard, it was observed that the sample collected from Neimeth pharmaceuticals exceeded the permissible level for iron and lead having the value of 0.0391mg/l and 0.0627mg/l, while most of the water samples analysed falls within the permissible limit in accordance with the WHO standards. Adequate care must be taken for further prevention and handling of chemical discharges from industries. The need for the treatment of the groundwater and control of human activities in the area to prevent further contamination must also be put be in place.
  • Item
    Open Access
    Evaluation of Soil Contaminant Level at Dumpsites in Nigeria
    (Elixir Agriculture, 2015) Ojekunle, Z.O.; Ojajuni, K.O.; Sangowusi, R.O.; Oyebanji, F.F.; Ojekunle, V.O.; Adekitan, A.A.; Odjegba, E.E.
    Some physical chemical characteristics and heavy metal levels in soil samples (Top and Sub) around dumpsites at Obantoko, Lafenwa, and Olomore vicinities of Abeokuta, Ogun State, Nigeria, were analysed in order to assess the effects of the dumps on the soils. Conventional analytical methods were employed for the determination of these physicochemical parameters while heavy metals in the soil samples where analysed using Atomic Absorption Spectrophotometer. The results of the physicochemical analysis showed that the pH values in all the sites ranged from 8.21 to 8.61 indicating alkalinity of the soils. The Total Organic Carbon values ranged from 1.06 to 2.76 indicating presence of some organic matter and some microbiological activities in the soil samples. Conductivity values ranges from 875 to 1119µs/cm indicated significant presence of some soluble inorganic salts in soils studied. For all the physical chemical values recorded, the soil samples at Lafenwa had slightly higher values than those of Olomore, and Obantoko. The mean concentration level of the three locations for Pb for the top and subsoils in Obantoko, Lafenwa, and Olomore were 13.50 and 11.31, 7.64 and 12.44, 9.90 and 11.06 (mgkg-1) respectively and that of for top and subsoil for same locations were Cr 5.76 and 7.01, 7.64 and 12.44, and 4.65 and 6.86 (mgkg-1) while Pb were not detected at all locations except at Lafenwa L2 where 2.24 mgkg-1 was detected in the subsoil. The levels of the metals at the sub-soil were all higher than the top soil at all the locations, except for Obantoko were the value of Pb at the top soil was greater than the value at the subsoil. A consistent trend showing a decrease in the concentration of heavy metals at the topsoil was observed for soil samples. The results from the study show that leaching occurs at dumpsites from the top to the subsoil which could cause a degree of contamination to ground water and living organims. These soils may therefore constitute a major health risk to the local population, and therefore, need be stringent measures to curtail the adverse effect it may pose to human health and the environment.
  • Item
    Open Access
    Evaluation of surface water quality indices and ecological risk assessment for heavy metals in scrap yard neighbourhood
    (2016) Ojekunle, O.Z.; Ojekunle, O.V.; Adeyemi, A.A.; Taiwo, A.G.; Sangowusi, O.R; Taiwo, A.M.; Adekitan, A.A.
    Pollution of surface water with heavy metals from industrial activities especially those from scrap yard has caused a major threat to human life exposing man to series of hazard, diseases, disability and consequently death. This study focuses on water quality indices of Owode-Onirin and Lafenwa scrap yard with respect to its physicochemical parameters and heavy metal concentrations by evaluating Heavy Metal Pollution Index (HPI), Metal Index (MI) and Potential Ecological Risk Index (PERI). Fifteen water samples were selected randomly from two locations by purposive sampling methods. Five heavy metals which includes Nickel (Ni), Zinc (Zn), Copper (Cu), Cadmium (Cd), Lead (Pb) were analyzed using Atomic Absorption Spectroscopy and standard analytical pro- cedure were follow to ensure accuracy. One way analysis of variance was carried out to analyse the data. The concentrations of the heavy metals were significantly different between sampling locations. However, the mean concentrations of Cd (0.0121 mg/L) were found to be above the highest permissible value of Standard Organization of Nigeria standards for drinking water (SON 2007) and WHO (Guidelines for drinking water quality: incorporating 1st and 2nd Addlenda. World Health Organization, Geneva, 2004) for drinking water. Although Pb was present in two out of the fifteen water sam-ples with a mean value of (0.0324 mg/L) which was also above the highest permissible value. The mean concentrations of Zn (0.2149 mg/L) and Cu (0.0341 mg/L) are found to be below the highest permissible value of the mentioned guideline while no trace of Ni was found in the water samples across the two sampling locations. The mean HPI 518.55 is far above the critical value of 100, indicates that selected water samples are critically polluted with heavy metals. MI revealed low quality water with mean value 4.83, suggests that the selected water is seriously affected with the present of heavy metal. The Hakanson PERI indicated that of the five heavy metals, the risk coefficient of Zn, Pb, Cu, and Ni had light levels of contamination while the level of Cd contamina- tion posed the most serious potential ecological risk, with an index value between 14.1 and 234. The study concluded that order of magnitude to this five heavy metals contamination is Cd > Pb > Zn > Cu > Ni.