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E-Journal of Chemistry
Volume 7 (2010), Issue 2, Pages 526-530

Determination of Heavy Metals in Crab and Prawn in Ojo Rivers Lagos, Nigeria

R. A. Olowu,1 O. O. Ayejuyo,3 A. Adejoroi,2 G. O. Adewuyi,2 M. O. Osundiya,1 C. T. Onwordi,1 K. A. Yusuf,3 and M. S. Owolabi1

1Department of Chemistry, Lagos State University (LASU), PMB 1087 Apapa, Lagos, Nigeria
2Department of Chemistry, University of Ibadan, Ibadan, Nigeria
3Department of Chemistry, University of Lagos, Lagos, Nigeria

Received 19 August 2009; Accepted 10 October 2009

Copyright © 2010 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The level of heavy metals in crabs and prawns was investigated using Atomic Absorption Spectrophotometer. The mean concentration of copper in the crab was 1.56±0.87 µg/g; the mean concentration of zinc in the crab was also 0.64±1.96 ܖg/g. Chromium had the highest mean concentration of 8.936±35.4 µg/g while cadmium had the lowest mean of 1.66±1.82 µg/g lead was not detected. The mean concentration of heavy metals in prawn samples were follows: copper: 1.04±0.6 µg/g, cadmium: 0.07±0.08 µg/g, chromium: 4.06±7.00 µg/g and Zn 0.64±0.45 µg/g. Lead was not detected in prawn. The mean concentration of copper, cadmium and zinc in prawn was observed to be within the range NAFDAC standard for water and aquatic foods while crabs have higher mean concentration of heavy metals with the exception of zinc and copper are within the limit.