EVALUATION DE LA CONCENTRATION DES ELEMENTS TRACES (Pb, Cu, Zn, Fe, Cd et Hg) DANS LES CREVETTES (macrobrachium vollenhovenii) DES LAGUNES AGHIEN ET POTOU (SUD-EST DE LA CÔTE D’IVOIRE)
Journal Title: Larhyss Journal - Year 2015, Vol 24, Issue 24
Abstract
This study aims to determine the concentrations of heavy metals (Cu, Pb, Fe, Cd, Zn and Hg) in prawns (Macrobrachium vollenhovenii) of lagoons Aghien and Potou in order to protect population’s heath. Nitric acid was added to every sample of water. Sediments samples were mineralized with hydrofluoric acid (HF) and aqua regia (HNO3: HCl; 1:3, v/v). Prawns samples were mineralized with nitric acid (HNO3) and hydrogen peroxide (H2O2). Then, all samples were analyzed with atomic absorption spectrometer (AAS) SpectrAA 110. Using AAS allowed showing that in lagoons waters the average concentrations of Pb (19.17 ± 1.93 µg/L) and Fe (2640.09 ± 256.22 µg/L) are higher than WHO standards. The average concentration of Cu (61.57 ± 19.36 mg/kg), Fe (63223.57 ± 5244.81 mg/kg) and Hg (1.77 ± 0.08 mg/kg) in lagoons sediments are superior to the concentrations of not polluted sediments. The average concentration of heavy metals in prawns are 0.34 ± 0.05 mg/kg, 0.02 ± 0.01 mg/kg, 1.12 ± 0.29 mg/kg, 0.04 ± 0.003 mg/kg, 2.21 ± 0.33 mg/kg and 0.71 ± 7.62 mg/kg respectively for Pb, Cd, Cu, Zn, Fe and Hg. 27 ± 7.4% of prawns are contaminated by lead, 24 ± 7.15% by cadmium, 38 ± 8.08% by copper, 70 ± 7,62% by iron and 76 ± 7.15% by mercury. All the analyzed prawns are unfit for human consumption. Bioconcentration factors show that heavy metals found in prawns come from waters and sediments as well as food they consume. Heavy metals which affect prawns habitats have natural and anthropogenic springs. Heavy metal accumulation can cause several diseases and dysfunctions of human body.
Authors and Affiliations
TRAORE A. | Laboratoire des Sciences et Techniques de l’Eau et de l’Environnement, UFR des Sciences de la terre et des ressources Minières 22 BP 582 Abidjan 22, Université Félix Houphouët Boigny de Cocody, Abidjan, Côte D’Ivoire, AKE-ASSI Y. | Laboratoire Central pour l’Hygiène Alimentaire et l’Agro-industrie, LANADA, Ministère de l’Agriculture, 04 BP 612 Abidjan 04, Côte d’Ivoire, AHOUSSI KOUASSI E. | Laboratoire des Sciences et Techniques de l’Eau et de l’Environnement, UFR des Sciences de la terre et des ressources Minières 22 BP 582 Abidjan 22, Université Félix Houphouët Boigny de Cocody, Abidjan, Côte D’Ivoire, SORO N. | Laboratoire des Sciences et Techniques de l’Eau et de l’Environnement, UFR des Sciences de la terre et des ressources Minières 22 BP 582 Abidjan 22, Université Félix Houphouët Boigny de Cocody, Abidjan, Côte D’Ivoire
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