title: Assessment of polybrominated diphenyl ethers in sediment of Asunle stream of the Obafemi Awolowo University, Ile-Ife, Nigeria.
abstract: Assessment of levels of polybrominated diphenyl ethers (PBDEs) from the sediment of Asunle stream, an adjourning stream of the Obafemi Awolowo University dumpsite, has been carried out. Sediment samples were collected from the stream at six locations for a period of 8 months, composed of 4 months each of wet (May-Aug) and dry (Nov-Feb) seasons. Soxhlet extraction was employed for the isolation of all the target compounds from the sediment samples. Extracts were further subjected to multi-layer column chromatography employing different forms of silica gel. The prepared samples were analyzed using GC-MS. The overall mean concentrations of the total PBDEs ranged from 1.80 to 9.46 ng/g. The results showed that the concentrations of the PBDEs were slightly higher during the wet season than those during the dry season. In all the studied locations, BDE28, BDE47, BDE99, BDE100, BDE153, and BDE154 were detected in all the sediment samples at concentrations that ranged from 0.73 to 10.43 ng/g. Results of this study indicated that BDE153 was the major pollutant of the Asunle stream sediments.
authors.affiliation: Department of Chemistry and Industrial Chemistry, Bowen University, Iwo, Nigeria. delog2@gmail.com.
authors.forename: Godwin O
authors.initials: GO
authors.lastname: Olutona
authors.affiliation: Department of Chemistry, Obafemi Awolowo University, Ile-Ife, Nigeria.
authors.forename: John A O
authors.initials: JA
authors.lastname: Oyekunle
authors.affiliation: Department of Chemistry, Obafemi Awolowo University, Ile-Ife, Nigeria.
authors.forename: Aderemi O
authors.initials: AO
authors.lastname: Ogunfowokan
authors.affiliation: Department of Chemistry, Faculty of Applied Sciences, Cape Peninsula University of Technology, Cape Town, South Africa.
authors.forename: Olalekan S
authors.initials: OS
authors.lastname: Fatoki
mesh_terms: D008401:Gas Chromatography-Mass Spectrometry; D019015:Geologic Sediments / Q000737:chemistry*; D055768:Halogenated Diphenyl Ethers / Q000032:analysis*; D009549:Nigeria; D045483:Rivers / Q000737:chemistry*
chemical_list: D055768:Halogenated Diphenyl Ethers
keywords: Asunle stream; Contamination; Gas chromatograph; Polybrominated diphenyl ethers (PBDEs); Sediment