| dc.contributor.author |
Daka, P.S. |
|
| dc.contributor.author |
Obuseng, V.C. |
|
| dc.contributor.author |
Torto, N. |
|
| dc.contributor.author |
Huntsman-Mapila, P. |
|
| dc.date.accessioned |
2010-11-04T14:35:34Z |
|
| dc.date.available |
2010-11-04T14:35:34Z |
|
| dc.date.issued |
2006 |
|
| dc.identifier.citation |
Daka P.S et.al (2006) Deltamethrin in sediment samples of the Okavango Delta, Botswana, Water SA, Vol. 32, No. 4, pp.483-488 |
en_US |
| dc.identifier.issn |
0378-4738 |
|
| dc.identifier.issn |
1816-7950 |
|
| dc.identifier.uri |
http://hdl.handle.net/10311/650 |
|
| 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_US |
| dc.language.iso |
en |
en_US |
| dc.publisher |
South African Water Research Commission http://www.wrc.org.za |
en_US |
| dc.subject |
Okavango Delta |
en_US |
| dc.subject |
Chromatography |
en_US |
| dc.subject |
Sediments |
en_US |
| dc.subject |
Deltamethrin |
en_US |
| dc.subject.lcsh |
Botswana |
en_US |
| dc.title |
Deltamethrin in sediment samples of the Okavango Delta, Botswana |
en_US |
| dc.type |
Published Article |
en_US |
| dc.link |
http://www.wrc.org.za/Pages/DisplayItem.aspx?ItemID=5303&FromURL=%2fPages%2fKH_AdvancedSearch.aspx%3fk%3dDeltamethrin%2bin%2bsediment%2bsamples%2bof%2bthe%2bOkavango%2bDelta%252c%26 |
en_US |