Levels of heavy metals in marine species: Oyster (Crassostrea virginica), Crab (Callinectes sapidus) and Shrimp (Litopenaeus setiferus) of Ciudad del Carmen, Campeche, Mexico
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Abstract
Cadmiun (Cd), Iron (Fe), Cooper (Cu), Lead (Pb) and Zinc (Zn), were analyzed in three seafood species (Oyster: Crassostrea virginica, Crab: Callinectes sapidus and Shrimp: Litopenaeus setiferus), representing three of the most important traditional fishery in the coastal lagoon state of Campeche, a portion of their catch is consumed locally, and are also exported to different parts of the country, mainly shrimp. The whole tissue (muscle) of the organisms was processed under the criteria of the NOM-117 in acid digestion with HNO3 and analyzed with Flame Atomic Absorption. The results show that both the oyster and crab are the foods that have high levels of Cd, Fe, Cu and Pb compared with shrimp (p <0.05). All levels found are within the limits established by the Mexican Official Standards for fishery products, so do not represent a risk to human consumption. Certain metals showed a significant correlations in the tissues analyzed for the case of the crab Cd, Pb and Zn are interrelated significantly (p <0.05), likewise for the oyster a significant correlation was found between Fe and Cu (p<0.05). These results suggest, that crabs and oysters are more susceptible to contamination by their eating habits and habitats where they thrive.
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