HEAVY METAL CONCENTRATION IN THE TISSUE AND CARAPACE OF TIGER PRAWN (Penaeus monodon) SOLD IN SELECTED SUPERMARKETS AND OPEN MARKET IN PORT HARCOURT
Abstract
This study was carried out to evaluate heavy metal concentration in the tissue and carapace of Tiger prawn (Penaeus monodon) sold in major supermarkets and market within Port-Harcourt metropolis. The prawns were purchased from Hyper city (Station 1), Next Cash and Carry (Station 2), Timeless Supermarket (Station 3) and open Market, Creek Road Market (Station 4). The tissue and carapace were tested for the presence of the selected heavy metals with their proximate composition. The concentration of heavy metals were determined by Atomic Absorption Spectrometry (AAS) method, following electro-thermal heater digestion. The Mean values recorded for the heavy metals in tissue ranged from 0.20-0.58mg/kg, 2.20-3.54mg/kg and 31.89-33.65mg/kg for Ni, Cu and Zn respectively. Concentration of Ni and Zn in tissue were higher in tiger prawn collected from open market while Cu was higher in tissues of tiger prawn collected from super market. The mean values recorded for the heavy metals in carapace ranged from 2.693-4.397 mg/kg, 3.587-7.267 mg/kg and 11.537-13.257 mg/kg for Cu, Ni and Zn respectively. The prawns collected from all stations are however, recommended for human consumption as the levels of heavy metal concentrations recorded did not exceed the limit for human consumption except for Ni. The high protein content found in the prawn should also consider it a major food for consumption.
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Published in JOURNAL OF AFRICAN CONTEMPORARY RESEARCH
ISSN: 9783-7967
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