ANALYSIS OF HYDROCARBONS PRESENT IN SEDIMENT OF SOME FLOOD PLAIN LAKES IN BAYELSA STATE,NIGER DELTA, NIGERIAP.N. MANILLA AND A. R. ADEBOYEAbstract Preliminary studies of the aliphatic and aromatic content of sediment samples from four lakes in the flood plain of the Niger Delta, Nigeria showed the presence of n-alkanes of C8-C33 in small concentration levels and an even over odd carbon predominance. All the lake sediments showed the presence of nC9-nC24 though L. Esiribi had n-alkanes of C8, C9, C10, and C14 in the surface sediment while the bottom sediment contained C8, C9, C13, C18, and C30. L. Egbedidi sediment also had nC33 hydrocarbons. The Polycyclic Aromatic Hydrocarbon profile obtained by gas chromatography showed sediments from L. Esiribi and Akpide had no detectable amount of polyaromatic hydrocarbons while L. Egbedidi contained anthracene (01.92mg/kg), phenanthrene (7.45 mg/kg), and Benzo (a) anthracene (78.54mg/kg) for the surface sediment and 7.60;84.01 and 10.95 mg/kg respectively for the bottom sediment. L. Aboh which has a gas cluster in its water shed also showed phenanthrene (44.42 mg/kg) in its sediment.
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