Please use this identifier to cite or link to this item: http://hdl.handle.net/10311/140
Title: Deltamethrin in sediment samples of the Okavango Delta, Botswana
Authors: Daka, P.S.
Obuseng, V.C.
Torto, N.
Huntsman-Mapila, P.
Keywords: Okavango Delta
Chromatography
Sediments
Deltamethrin
Issue Date: Oct-2006
Publisher: Water SA Pretoria; Water Research Commission; http://www.wrc.org.za/
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
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.
URI: http://hdl.handle.net/10311/140
ISSN: 0378-4738 (print)
1816-7950 (online)
Appears in Collections:Research articles (Dept of Chemistry)

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