oa Botswana Notes & Records - Spatial and Seasonal Variation of Major Cation and Selected Trace Metal Ion Concentrations in the Okavango-Maunachira-Khwai Channels of the Okavango Delta

Volume 37, Issue 1
  • ISSN : 0525-5090



The concentration of the metal ions Na, K, Ca, Mg, Zn, Cu, Mn, Co, Fe, Cr, Ni, and Pb were determined in water samples of the Okavango Delta's panhandle - Maunachlra-Khwai water system during periods of high (June 2004) and low (November 2004) water flow. The concentrations of Na, K, Ca and Mg increased with distance from Mohembo indicating concentration of these metal ions by evaporation. Cu, Co, Fe, Ni, Mn and Pb generally decreased in concentration with increase in distance from Mohembo, indicating that the Delta acts as a filter for these ions. Zn had lower concentrations at Mohembo than the other sampling sites, indicating solubilisation of previously deposited metals ions, or presence of Zn within the Delta. Chromium was not detected except at Seronga during periods of high water flow.

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