Browsing by Author "Olelewe, M.C."
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Item GEOSTATISTICS AND MULTIVARIATE ANALYSIS OF HYDROGEOCHEMICAL PARAMETERS OF ELEYELE LAKE, IBADAN, SOUTH WEST NIGERIA(Published by Faculty of Physical Sciences, Nnamdi Azikiwe University, Awka, Anambra State, Nigeria., 2021) Iheme, K.O.; Olelewe, M.C.; Omotoso, O. A.; Okolo, C.J.; Atanu, O.Evaluation of Eleyele Lake and Wetland, Ibadan South Western Nigeria was carried out to acertain the contamination state of the water bodies. 29 water samples were collected from the lake and its effluents streams, and were geochemically analzyed using Inductively Coupled Plasma-Mass Spectrometery (ICP-MP) while the pH, total dissolved solids (TDS), and electrical conductivity (EC) were measured insitu during the sampling operations. Values of pH, TDS, EC, and metals with significant concentrations in the samples were selected as variables used for geostatistical analysis, and multivariate analysis; principal component analysis (PCA) and hierarchical cluster analysis (HCA). Comparison of geostatistical analysis result with Nigerian Standard for Drinking Water Quality, shows that EC, TDS, iron (Fe), and aluminum (Al) concentration were above the recomended limits in many locations. PCA results show that the first 2 principal components accounts for 79.7% of the variability or information in the samples. PC scores clearly revealed two clusters which was indicative of where the water sample was collected; Lake or Tributary/effluent streams. Hierarchical clustering identified three clusters of samples but subsequent piper digram of the clusters revealed that clusters 2 and 3 were more alike and less contaminated by sodium (Na) compared to water samples in cluster 1.Item Preliminary Health Risk Assessment in Relation to Some Trace Elements in Ogunpa River, South-Western Nigeria(LAUTECH Journal of Civil and Environmental Studies, 2021) Omotoso, O.A.; Ojo, O.J.; Ige, O.O.; Olaleye, I.M.; Adewoye, O.A.; Olelewe, M.C.Ogunpa River receives municipal and industrial waste discharge from its catchments and these have depleted the quality of the water. Hence, this research examines the preliminary environmental impacts and health implications of some trace elements in the water using Inductively Coupled Plasma-Mass Spectrometry (ICP-MS) laboratory technique. Average values of Al, Ba, Fe, Mn, Ni and Pb are above the recommended limits of WHO. The CF showed that the trace elements varied from considerable contamination factor to very high contamination factor and the degree of 4contamination varied from 1023 to 11640. The hazard quotient computed for the adults is generally less than unity except Pb that has average value of 1.27. In children, the computed hazard quotient on the average ranges from 0.000572 to 4.04. Al, As, Ba, Cr, Cu, Ni, Zn and Cd have their average values less than unity respectively, while Fe, Mn and Pb has their average values greater than one. The Hazard Index (HI) in adults and children are greater than one. Carcinogenic risk assessment was computed for Cr, Pb and Cd which was greater than 10-6 in children and adult. Only Cd in adult was less than the prescribed limit of 10-6. Effort should be made to checkmate indiscriminate dumping of refuse and sewages into the water body as these could serve as pollutants to other adjourning rivers and main water bodies. In conclusion, the water is not fit for domestic, agricultural and probably industrial uses because of its health implications on consumption