Assessment of environmental and radiological health hazards due to heavy metals and radionuclides contents in utility water reservoirs' sediments
by Omoniyi Matthew Isinkaye; James Ibitoye Agbi; Yinka Ajiboye; Romanus Ayoola Obasi
International Journal of Environment and Health (IJENVH), Vol. 8, No. 3, 2017

Abstract: Heavy metals and natural radionuclides in sediments of Awara and Osse reservoirs, Ondo State, Nigeria have been measured using X-ray fluorescence and γ-ray spectrometry techniques. Heavy metals detected in the two reservoirs include K, Ca, Ti, V, Cr, Mn, Fe, Ni, Cu, Zn, As, Ba, Pb and Th. The average concentrations of the measured heavy and trace metals in the sediment of Awara dam vary as Fe>K>Ca>Mn>Ti> Sr>Cr>V>Rb>Zn>Ni>Cu while those of Osse dam vary as Ba>K>Fe>Ca> Mn>Sr>Ti>V>Rb>Cr>Zn>Ni>Th>Pb>Cu. Geoaccumulation index and enrichment factor evaluation of potentially toxic heavy metal contents in both reservoirs revealed that the two reservoirs are uncontaminated with hazardous heavy metals. Naturally occurring radionuclides (⁴⁰K and ²³²Th) detected in the two reservoirs show values that are higher than their mean crustal value, while ²²⁶Ra is lower than the world mean crustal value. There is little or no ecological or radiological risk associated with the sediment of the two reservoirs.

Online publication date: Tue, 29-Aug-2017

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