Abstract
The hydrocarbon distribution in sediments and water samples of the Port Harcourt segment of the New Calabar River, Nigeria was sampled during the wet and dry seasons of 1990 and 1991. The results demonstrate that a very heterogenous distribution of petroleum hydrocarbon exists in this segment of the river and that the life-style and feeding habits of the organisms in this environment will have a dramatic effect on their hydrocarbon exposure. Site variability indicates that most of the hydrocarbons in sediment and water of the New Calabar River are of anthropogenic origin. The baseline station, BLF, is the least exposed to petroleum hydrocarbon pollution. Seasonal variation gave a high hydrocarbon level during the rainy season which resulted from slow rate of volatilization during this season. Contamination factor, measured as the ratio of the median concentration in the monitoring zones and the median concentration of the baseline values ranged from 1.73 to 8.47 in sediments and 2.02 to 2.62 in water.
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