Show simple item record Huntsman-Mapila, P. Mapila, T. Letshwenyo, M. Wolski, P. Hemond, C. 2008-06-19T08:05:37Z 2008-06-19T08:05:37Z 2006
dc.identifier.citation Huntsman-Mapila, P. et al (2006) Characterization of arsenic occurrence in the water and sediments of the Okavango Delta, NW Botswana, Applied Geochemistry 21 pp. 1376-1391 en
dc.identifier.issn 0883-2927
dc.description.abstract Detailed chemical analyses were performed on surface water, groundwater and sediment samples collected from the Okavango Delta between February and November 2003 in order to examine the distribution and geochemistry of naturally occurring As in the area. Surface water in the Okavango Delta, which is neutral to slightly acidic and has high dissolved organic C (DOC), was found to be slightly enriched in As when compared to a global value for stream water. Of the 20 new borehole analyses from this project, six were found to have values exceeding 10 ug/L. the current World Health Organization provisional guideline value for As. The results from field speciation indicate that As(III) is slightly more predominant than As(V). There is a positive correlation between As and pH and between As and DOC in the groundwater samples. For the sediment samples, there is a positive correlation between As and Co. As and Fe. As and loss on ignition (LOI) and between As and the percent fines in the sample. Reductive dissolution of oxides and hydroxides in the sediments with organic C as an electron acceptor is the likely mechanism for the release of As from the sediments into the groundwater. en
dc.language.iso en en
dc.publisher Elsevier Science B.V. Amsterdam; en
dc.subject Naturally occuring As en
dc.subject Sediment en
dc.subject Groundwater en
dc.subject Geochemistry en
dc.subject Surface water en
dc.subject Okavango Delta en
dc.title Characterization of arsenic occurrence in the water and sediments of the Okavango Delta, NW Botswana en
dc.type Article en

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