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Exposure level and bioaccumulation of polycyclic aromatic hydrocarbons (PAHs) in edible marine organisms p.69-88

 


Journal of Environmental Indicators, 5: 69-88, 2010

ISAAC A. OLOLADE, and LABUNMI LAJIDE

Department of Chemistry and Industrial Chemistry, Adekunle Ajasin University, P.M.B 001, Akungba-Akoko, Ondo-State, Nigeria. olisa200@yahoo.com Department of Chemistry, Federal University of Technology, P.M.B 734. Akure, Nigeria.

The results show that total PAHs (with bioconcentration factors in brackets) varied from less than minimum detectable limit (MDL) to 6.87 μg/g (7.83 – 44.45) in fish, 0.02 to 85.6 μg/g (234.5 – 279.6) in crab and <MDL to 79.43 μg/g (219.8 – 243.9) in periwinkle. PAHs composition pattern was dominated by 2 to 3-rings (83.3%) followed by those of 4-rings (12.5%) and 5-rings (4.2%). Higher PAH content was found during the wet season in periwinkles (62.8%) and crab (59.5%) unlike in fish. The bioconcentration factors (BCFs) ranged from 7.83 – 44.45; 219.8 – 243.9 and 234.5 – 279.6 in fish, periwinkles and crabs respectively. Biota-sediment accumulation factor (BSAF) for the 4- and 5-member rings are much higher than those for the 3-member rings PAHs. The BSAF tend to decrease with increasing PAHs concentration in sediments. Fish showed little tendency to bioaccumulate PAHs due to their rapid metabolism, unlike crab and periwinkle with very poor metabolic capacity. With regard to PAH bioaccumulation, whole body of periwinkles seems to be the species best suited as an indicator organism.

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