RESEARCH JOURNAL OF FOOD SCIENCE AND NUTRITION
Integrity Research Journals

ISSN: 2536-7080
Model: Open Access/Peer Reviewed
DOI: 10.31248/RJFSN
Start Year: 2016
Email: rjfsn@integrityresjournals.org


Heavy metal levels in Tilapia zilli samples from North Central Nigerian rivers

https://doi.org/10.31248/RJFSN2016.019   |   Article Number: 3BCD38091   |   Vol.1 (3) - December 2016

Received Date: 30 August 2016   |   Accepted Date: 16 October 2016  |   Published Date: 30 December 2016

Authors:  Ogah E.* , Malu S. P. , Ushie O. A. , Longbap B. D. and Abiaziem C. V.

Keywords: Heavy metals, pollution., Bioaccumulation aquatic organisms, river.

The determination of Cd, Cr, Mn, Ni, Pb contents in Tilapia zilli of North Central Nigeria Rivers were made using Atomic Absorption spectrophotometric technique. The method of acid digestion in 1:5:1, 70% perchloric, concentrated nitric and concentrated sulphuric acid was used to liberate the metals. The concentration of heavy metals (mg/kg) during the wet season ranged between 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 showing that once heavy metals are bioaccumulated they are lost slowly or not all. The results also show that the concentrations recorded for Cd, Cr, Mn, Ni and Pb are above the guideline values of WHO and FEPA and are not fit for human consumption.

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