METAL CONTENTS IN FISH AND CRUSTACEANS FROM BRACKISH, FRESHWATER AND MARINE SYSTEMS IN SOUTH-WESTERN NIGERIA

Abstract

Prikazanom studijom istražene su koncentracije elemenata u tragovima u mišićima ili cijelim uzorcima 37 riba i rakova sakupljenim mrežama stajačicama u slatkovodnim (Olomore), morskim (Eti osa) i boćatim vodama nigerijskih država Ogun i Lagos, od lipnja do kolovoza 2013. Elementi u tragovima utvrđeni su pomoću ICP-MS nakon digestije u mikrovalnom autoklavnom sustavu. Razultati su otkrili kako je opći trend elemenata u tragovima u uzorkovanim ribama i rakovima morski > boćati > slatkovodni. Uzimajući u obzir sve uzorke, 16,2% i 13,5% prekoračilo je granice bakra i cinka (20 µg g-1 i 30 µg g-1), propisane od strane Europske Unije, dok je 71%, 50%, 79% morskih, slatkovodnih i boćatih uzoraka prekoračilo granicu od 48mg željeza na 60kg čovjeka, koju je postavila FAO/WHO. Uzorci su premašili prihvatljivu granicu postavljenu od strane FAO/WHO, čime je dokazano kako je potrebno uložiti trud u monitoring otpadnih voda koje se ispuštaju u otvorene vode Nigerije.Present study investigated trace element concentrations in either muscles or whole samples of 37 finfish and crustaceans harvested with gillnet from fresh (Olomore), marine (Eti osa) and brackish (Lekki Lagoon) waters of Ogun and Lagos states, Nigeria between June and August 2013. Trace elements were determined using ICP-MS after digestion with a microwave autoclave system. The results revealed that the general trend of trace elements in the sampled finfish and crustaceans was marine > brackish > freshwater. If all the samples are considered, 16.2% and 13.5% exceeded the 20 µg g-1 and 30 µg g-1 limits for Cu and Zn, respectively, as set by the European Union, while 71%, 50%, 79% of marine, fresh and brackish samples, respectively, exceeded the limit of 48 mg Fe per 60 kg person as set by FAO/WHO. In addition, samples exceeded the acceptable limit set by WHO/FAO, thus adequate efforts should be placed on the monitoring of effluents that are being discharged into open water bodies in Nigeria

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