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Vol.1 , No. 1, Publication Date: Mar. 26, 2016, Page: 1-5
, mercury (Hg), chromium (Cr), lead (Pb), zinc (Zn), cadmium (Cd) and nickel (Ni) and polycyclic aromatic hydrocarbon (PAHs) in Atlantic Tarpon, <i>Megalops atlanticus</i> and Lady fish, <i>Elops saurus</i>. Fish samples were collected from Ororefe river in Ajanesan Oghara town, Ethiope Local Government Area in Delta State. Atomic absorption spectrophotometer (AAS) was used to determine heavy metal concentration and agilant 6890N Gas chromatography (GC) to determine polycyclic aromatic hydrocarbon. Mean values of Pb, Hg, Zn and Cd in <i>Megalops atlanticus</i> (0.33mg/kg, 0.00mg/kg, 14.08mg/kg and 0.00mg/kg respectively and in <i>Elops saurus</i> (0.18mg/kg, 0.00mg.kg, 19.59mg/kg and 0.00mg/kg) were between the permissible limits of WHO and FEPA. Ni & Cr concentratons in <i>Megalops atlanticus</i> (3.69mg/kg, 2mg/kg), and (2.92mg/kg and 1.37mg/kg) in <i>Elops saurus</i> exceeded the permissible limit of WHO and FEPA. Cu concentration in <i>Megalops atlanticus</i> (2.79mg/kg) fell within the permissible limit but in Elops saurus (4.43mg/kg), it exceeded the permissible limit of WHO and FEPA. PAHs detected were benzo (g,h,i) perylene (0.22828 mg/kg), benzo (k) fluoranthene (0.0015mg/kg), fluorene (0.07845mg/kg) and naphthalene (0.13 to 1mg/kg), in <i>Megalops atlanticus</i> and benzo (k) fluoranthene (0.0745mg/kg), indeno (1,2,3–cd) pyrene (0.00214mg/kg), naphthalene (0.7458mg/kg), and pyrene (0.14216mg/kg) in <i>Elops Saurus</i>. Total PAHs concentration was higher in <i>Megalops atlanticus</i> (0.51281mg/kg) than in <i>Elops Saurus</i> (0.39103mg/kg) with higher value of high molecular weight (HMW) PAHs as compared with low molecular weight (LMW) PAHs which tend to be carcinogenic and mutagenic. The LMW – PAH/HMW ratio was less than one for both species, indicating anthropogenic origin of PAHs which tend to be carcinogenic and mutagenic on bioaccumulation. However, repeated and long-term consumption of fish species from river Ororefe could lead to toxicity in human due to bioaccumulation of these toxicants.&picture=http://www.aascit.org/aascit/decorators/img/journal/832.jpg)
| [1] | Peters D. E., Deparatment of Biochemistry, University of Port Harcourt Choba, Rivers State, Nigeria. |
| [2] | Bala B. K., Deparatment of Biochemistry, University of Port Harcourt Choba, Rivers State, Nigeria. |
| [3] | Abbey B. W., Deparatment of Biochemistry, University of Port Harcourt Choba, Rivers State, Nigeria. |
Study was carried out to determine the level of some heavy metals: copper (Cu), mercury (Hg), chromium (Cr), lead (Pb), zinc (Zn), cadmium (Cd) and nickel (Ni) and polycyclic aromatic hydrocarbon (PAHs) in Atlantic Tarpon, Megalops atlanticus and Lady fish, Elops saurus. Fish samples were collected from Ororefe river in Ajanesan Oghara town, Ethiope Local Government Area in Delta State. Atomic absorption spectrophotometer (AAS) was used to determine heavy metal concentration and agilant 6890N Gas chromatography (GC) to determine polycyclic aromatic hydrocarbon. Mean values of Pb, Hg, Zn and Cd in Megalops atlanticus (0.33mg/kg, 0.00mg/kg, 14.08mg/kg and 0.00mg/kg respectively and in Elops saurus (0.18mg/kg, 0.00mg.kg, 19.59mg/kg and 0.00mg/kg) were between the permissible limits of WHO and FEPA. Ni & Cr concentratons in Megalops atlanticus (3.69mg/kg, 2mg/kg), and (2.92mg/kg and 1.37mg/kg) in Elops saurus exceeded the permissible limit of WHO and FEPA. Cu concentration in Megalops atlanticus (2.79mg/kg) fell within the permissible limit but in Elops saurus (4.43mg/kg), it exceeded the permissible limit of WHO and FEPA. PAHs detected were benzo (g,h,i) perylene (0.22828 mg/kg), benzo (k) fluoranthene (0.0015mg/kg), fluorene (0.07845mg/kg) and naphthalene (0.13 to 1mg/kg), in Megalops atlanticus and benzo (k) fluoranthene (0.0745mg/kg), indeno (1,2,3–cd) pyrene (0.00214mg/kg), naphthalene (0.7458mg/kg), and pyrene (0.14216mg/kg) in Elops Saurus. Total PAHs concentration was higher in Megalops atlanticus (0.51281mg/kg) than in Elops Saurus (0.39103mg/kg) with higher value of high molecular weight (HMW) PAHs as compared with low molecular weight (LMW) PAHs which tend to be carcinogenic and mutagenic. The LMW – PAH/HMW ratio was less than one for both species, indicating anthropogenic origin of PAHs which tend to be carcinogenic and mutagenic on bioaccumulation. However, repeated and long-term consumption of fish species from river Ororefe could lead to toxicity in human due to bioaccumulation of these toxicants.
Keywords
Atomic Absorption Spectrophotometer (AAS), Gas Chromatography (GC), Atlantic Tarpon, Megalops atlanticus and Lady Fish, Elops saurus, Polycyclic Aromatic Hydrocarbon (PAHs)
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