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Major and trace element geochemistry in Zeekoevlei, South Africa: A lacustrine record of present and past processes
Stockholm University, Faculty of Science, Department of Geology and Geochemistry.
Stockholm University, Faculty of Science, Department of Geology and Geochemistry.
2008 (English)In: Applied Geochemistry, ISSN 0883-2927, E-ISSN 1872-9134, Vol. 23, no 8, 2496-2511 p.Article in journal (Refereed) Published
Abstract [en]

This study reports a multi-parameter geochemcial investigation in water and sediments of a shallow hyper-eutrophic urban freshwater coastal lake, Zeekoevlei, in South Africa. Zeekoevlei receives it greater fraction of dissolved major and trace elements from natural Sources (e.g., chemical weathering and sea salt). Fertilizers, agricultural wastes, raw sewage effluents and road runoff in contrast, constitute the predominant anthropogenic sources, which supply As, Cd, Cu, Pb and Zn in this lake. The overall low dissolved metal load results from negligible industrial Pollution, high pH and elevated metal Uptake by phytoplankton. However, the surface sediments are highly polluted with Pb, Cd and Zn. Wind-induced sediment resuspension results in increased particulate and dissolved element concentrations in bottom waters. Low C/N ratio (10) indicates primarily an algal Source for the sedimentary organic matter. Variation in sedimentary organic C content with depth indicates a change in primary productivity in response to historical events (e.g., seepage from wastewater treatment plant, dredging and urbanization). Primary productivity controls the enrichment of most of the metals ill sediments, and elevated productivity with higher accumulation of planktonic debris (and siltation) results in increased element concentration in surface and deeper sediments. Aluminium, Fe and/or Mn oxy-hydroxides, clay minerals and calcareous sediments also play an important role in adsorbing metals in Zeekoevlei Sediments. 

Place, publisher, year, edition, pages
2008. Vol. 23, no 8, 2496-2511 p.
Keyword [en]
organic-matter, heavy-metal, environmental-changes, sulfur geochemistry, water chemistry, surface waters, lake-sediments, tropical lake, western cape, crater lake
National Category
Earth and Related Environmental Sciences
URN: urn:nbn:se:su:diva-57875DOI: 10.1016/j.apgeochem.2008.02.011ISI: 000259171700040OAI: diva2:418501
authorCount :4Available from: 2011-05-23 Created: 2011-05-23 Last updated: 2011-05-23Bibliographically approved

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