Comparative Study of Persistent Toxic Metal Levels in Land Crab (Cardiosoma armatum) and Lagoon Crab (Callinectes amnicola) in Lagos Lagoon.
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Lawal-Are, A. O.
The comparative study of persistent toxic metal levels of two species of crab Cardiosoma armatum and Callinectes amnicola were studied from June 2009 to October 2009. This work provides information on the concentration of Cd, Zn, Ni, Fe and Pb in the limb, shell, flesh and gills of the two species of crab, their environment - water and sediments, and also analysis with a view to assessing accumulation of metals in the organisms. Metal concentration was determined following wet digestion and analyzed using Atomic Absorption Spectrophotometer (AAS). The concentrations observed in crab samples were lower than the WHO permissible level of 2.00µg/g for Lead (Pb) and Cadmium (Cd) in foods. The mean values obtained fell in the ranges: Fe (0.041-0.219µg/g); Zn (0.647-1.774µg/g); Cd (0.093-0.635µg/g); Ni (0.261-0.825µg/g); Pb (0.160-0.261µg/g) for Callinectes amnicola and Fe (0.071-0.313µg/g); Zn (0.8071.731µg/g); Cd (0.022-0.663µg/g); Ni (0.181-1.279µg/g); Pb (0.151-0.501µg/g) for Cardiosoma armatum. Although, the levels were lower than the permissible levels, it was observed that Cardiosoma armatum and Callinectes amnicola accumulated more than the environment. There was no significant difference in the distribution of metals between the two crabs at 95% confidence level. This is indicative of bioaccumulation of the persistent toxic metals in the organism.
comparative , Cardiosoma armatum , Callinectes amnicola , Persistent toxic metals , bioaccumulation , Research Subject Categories::NATURAL SCIENCES
Oyebisi, A., Lawal-Are, A.O., and Alo, B. (2013). Comparative Study of Persistent Toxic Metal Levels in Land Crab (Cardiosoma armatum) and Lagoon Crab (Callinectes amnicola) in Lagos Lagoon.