HEALTH RISK APPRAISAL OF SELECTED HEAVY METALS IN EDIBLE AQUATIC MOLLUSCS OF LAGOS, NIGERIA

R O MORUF, A F DUROJAIYE

Abstract


The concentrations of Mn, Cu, Fe, Zn, Hg and Cr were analyzed in the edible part of four species of aquatic molluscs collected in different fish markets in Lagos using standard methods. Assessing the metal levels in periwinkle, oyster, clam and cuttlefish, muscle levels in mg kg-1 of Mn (0.57±0.00), Zn (2.85±0.00) and Cr (0.69±0.01) in clam were significantly higher (p<0.05) than their corresponding values in other examined mollusc species. Lowest mean levels (mg kg−1) of Mn (0.002±0.00), Fe (0.504±0.02) and Cu (0.025±0.00) in oyster, Zn (0.131±0.02) in periwinkle, Hg (0.001±0.00) and Cr (0.004±0.00) in cuttlefish were observed. However, the mean values of Fe, Cu and Hg were not significantly different across samples. The estimated daily intake of heavy metals (mg person-1day-1) revealed that Mn (0.000001) in oyster and Hg (0.000001) in cuttlefish contributed the lowest daily intake while Fe (0.000264) in oyster contributed the highest daily intake. Total hazard quotient (THQ) values for the heavy metals followed descending order of Cu > Hg > Zn > Fe >Mn> Cr. The major risk contributor in terms of organism was clam with 33.20%. It is concluded that the mean heavy metal levels in muscle tissues of the examined species do not pose any threat (THQ< 1) as far as human health is concerned.


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