Author: Olisah Chinedu Micheal
Department: Chemical Pathology
Affiliation: Nnamdi Azikiwe University Awka
The concentration of some toxic elements (Mercury, Lead, Cadmium and Arsenic) and some essential elements (Cobalt, Copper, Chromium; Manganese, Selenium and Zinc) in fish obtained from Oguta, Agulu lakes and Fish pond in South Eastern Nigeria were determined using rapid, highly sensitive accurate method. A stepwise digestion procedure using optima Fisher concentrated nitric acid and hydrogen peroxide was used for complete oxidation of organic tissue. The concentrations of the various elements were measured using Varian AA240 Atomic Absorption mass spectrophotometer. A total of 56 fish samples covering three different species of tilapia;Tilapiazilli, Cat fish; Clariasgariepinus and Synodontusfilamentosis were analysed for their elemental contents.Results of the study indicate low levels of exposure to Chromium,Cobalt,Copper, Manganese,Selenium and Zinc while the levels of toxic elements Lead, Mecury, Cadmium and Arsenic were within maximum acceptable limits in fish pond but above maximum acceptable limits in lakes especially from Oguta lakes. The consumption of these species of fish maypose a significant health risk to the individuals and to a greater extent the general population.
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