Show simple item record Daka, P.S. Obuseng, V.C. Torto, N. Huntsman-Mapila, P. 2008-07-02T08:16:45Z 2008-07-02T08:16:45Z 2006-10
dc.identifier.citation Daka, P.S. et al 2006) Deltamethrin in sediment samples of the Okavango Delta, Botswana, Water SA Vol. 32 No. 4, October, pp. 483-488 en
dc.identifier.issn 0378-4738 (print)
dc.identifier.issn 1816-7950 (online)
dc.description.abstract Deltamethrin concentrations were determined in 35 sediment samples collected from three different habitats: channel, lagoon and pool sites from Xakanaxa in the Okavango Delta, NW Botswana. The samples were Soxhlet-extracted in acetone to extract deltamethrin residues and subsequently cleaned-up with silica gel 60. The final determination was carried out with a gas chromatograph equipped with an electron capture detector (GC-ECD). The sample work-up and determination gave deltamethrin recoveries of 54 to 97%, and detection limits of 0.004 mg/kg dw. The concentration of deltamethrin residues in the sediment samples collected from the three sprayed areas in the Okavango delta ranged between 0.013 and 0.291 mg/kg dw, with the highest concentrations observed in samples obtained from the pool sites. Analysis of samples for organic matter content showed percentage total organic carbon (% TOC) ranging between 0.19% and 8.21%, with samples collected from the pool having the highest total organic carbon. The concentrations of deltamethrin residues and the % TOC in sediment samples showed a similar trend with the highest levels recorded in the pool samples. These data confirmed that a simple method based on GC-ECD, after Soxhlet extraction, was robust enough to enable quantification of deltamethrin in the sediments, because comparable results were obtained with a more sophisticated system consisting of a GC coupled to a mass spectrometer with a time of flight (TOF) analyser. en
dc.language.iso en en
dc.publisher Water SA Pretoria; Water Research Commission; en
dc.subject Okavango Delta en
dc.subject Chromatography en
dc.subject Sediments en
dc.subject Deltamethrin en
dc.title Deltamethrin in sediment samples of the Okavango Delta, Botswana en
dc.type Article en

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