Spatial Monitoring of Organohalogen Compounds in Surface Water and Sediments of a Rural-Urban River Basin in Tanzania

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dc.contributor.authorHellar-Kihampa, Harieth
dc.contributor.authorDe Wael, Karolien
dc.contributor.authorLugwisha, Esther H. J.
dc.contributor.authorMalarvannan, Govindan
dc.contributor.authorCovaci, Adrian
dc.contributor.authorVan Grieken, René
dc.date.accessioned2016-06-16T18:25:56Z
dc.date.available2016-06-16T18:25:56Z
dc.date.issued2013-02
dc.descriptionFull text can be aqcce3ssed at http://www.sciencedirect.com/science/article/pii/S0048969712016403en_US
dc.description.abstractThe presence of persistent organic pollutants in Tanzanian environment is not well monitored despite the existing pollution potential from a number of sources. In this study, we investigated for the first time, the concentration profiles of different organohalogen compounds such as organochlorine pesticide residues (OCPs), polychlorinated biphenyls (PCBs) and polybrominated diphenyl ethers (PBDEs) in environmental samples (water and sediments) from the Pangani river basin (PRB). The PRB is one of the largest drainage basins in Tanzania, with its watershed exposed to multiple input sources of trace organic contaminants. Surface water and sediments were sampled from 12 representative stations of diverse characteristics and land-use practices, in three distinct seasons, and extracted by liquid-liquid and Soxhlet extraction methods, respectively. Water samples were analyzed by GC-ECD for OCPs only, while sediment samples were analyzed for OCPs, PCBs and PBDEs by GC/MS. Seven compounds, dominated by HCH isomers (510-4460pg/L) and DDT analogs (160-1460pg/L),were detected in the water samples. These concentrations are far below the WHO guidelines for drinking water quality. A total of 42 compounds (8 OCPs, 28 PCB congeners and 6 PBDE congeners) were detected in the sediment samples. Their respective total concentration ranges were 245-10,230; 357-11,000 and 38-2175pg/g dry weight. The spatial distribution patterns and Hierarchical Cluster Analysis reflected the impact of historical agricultural usage in sugarcane plantations (OCPs), and urbanization (PCBs and PBDEs). Risk assessment using sediment quality guidelines indicated no ecotoxicological risks. The results we have found provide preliminary data on levels of the organic contaminants in Pangani river basin as a new insight on the environmental quality of the area.en_US
dc.identifier.citationHellar-Kihampa, H., De Wael, K., Lugwisha, E., Malarvannan, G., Covaci, A. and Van Grieken, R., 2013. Spatial monitoring of organohalogen compounds in surface water and sediments of a rural–urban river basin in Tanzania. Science of the Total Environment, 447, pp.186-197.en_US
dc.identifier.doi10.1016/j.scitotenv.2012.12.083
dc.identifier.urihttp://hdl.handle.net/20.500.11810/2524
dc.language.isoenen_US
dc.publisherElsevieren_US
dc.subjectOrganochlorine pesticidesen_US
dc.subjectPolychlorinated biphenylsen_US
dc.subjectPolybrominated diphenyl ethersen_US
dc.subjectWater and sediment qualityen_US
dc.subjectPangani river basinen_US
dc.subjectTanzaniaen_US
dc.titleSpatial Monitoring of Organohalogen Compounds in Surface Water and Sediments of a Rural-Urban River Basin in Tanzaniaen_US
dc.typeJournal Articleen_US
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