OGAH, E. and Abiaziem, C. V and MALU, S.P and USHIE, O.A. and LONGBAP, B.D (2015) HEAVY METALS LEVELS IN TILAPIA SAMPLES FROM NORTH CENTRAL NIGERIAN RIVERS. Ewemen Journal of Analytical & Environmental Chemistry, 1 (1). pp. 1-8.
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Abstract
Heavy metal pollution in foods and the environment has remained a reoccurring decimal in sub-Saharan Africa and in Nigeria in particular. The determination of Cd, Cr, Mn, Ni, Pb contents in Tilapia zilli of the rivers of North-central Nigeria were made using Atomic Absorption spectrophotometric technique. Acid digestion consisting of 70% perchloric, concentrated nitric and concentrated sulphuric acid, in ration 1:5:1, was used to liberate the metals from the samples. The concentrations of the heavy metals (mg/kg) during the wet (rainy) season ranged from 0.0-25.4, 0.1-40.2, 1.4-435.1, 0.5-15.7, 0.4-25.4, for Cd, Cr, Mn, Ni and Pb, respectively, while in the dry season the concentrations ranged between 0.3-13.0, 0.8-31.2, 5.2-344.2, 0.6-25.1, 0.1-45.6, for Cd, Cr, Mn, Ni and Pb, respectively. The mean concentration of the heavy metals follow the pattern Mn>Cr>Pb>Ni>Cd during both seasons suggesting that once heavy metals are bio-accumulated they are either totally retained or lost through a very slow and gradual process. The results also show that the concentrations of Cd, Cr, Mn, Ni and Pb in the T. zilli samples were above the normal range in the WHO and FEPA guidelines and were therefore rendered the samples unfit for human consumption.
| Item Type: | Article |
|---|---|
| Subjects: | Q Science > Q Science (General) |
| Divisions: | Faculty of Engineering, Science and Mathematics > School of Chemistry |
| Depositing User: | Mr Taiwo Egbeyemi |
| Date Deposited: | 02 Jun 2020 15:07 |
| Last Modified: | 02 Jun 2020 15:07 |
| URI: | http://eprints.federalpolyilaro.edu.ng/id/eprint/337 |
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