Major and trace element geochemistry in Zeekoevlei, South Africa: A lacustrine record of present and past processes

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Das, Supriyo KumarStockholms universitet,Institutionen för geologi och geokemi,Department of Geology and Geochemistry, Stockholm University, Stockholm, Sweden (author)

Major and trace element geochemistry in Zeekoevlei, South Africa : A lacustrine record of present and past processes

Article/chapterEnglish2008

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Elsevier BV,2008
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LIBRIS-ID:oai:DiVA.org:su-57875
https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-57875URI
https://doi.org/10.1016/j.apgeochem.2008.02.011DOI
https://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-151437URI

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Language:English
Summary in:English

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Subject category:art swepub-publicationtype

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authorCount :4
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.

Subject headings and genre

NATURVETENSKAP Geovetenskap och miljövetenskap hsv//swe
NATURAL SCIENCES Earth and Related Environmental Sciences hsv//eng
organic-matter
heavy-metal
environmental-changes
sulfur geochemistry
water chemistry
surface waters
lake-sediments
tropical lake
western cape
crater lake
Earth sciences
Geovetenskap

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Routh, Joyanto,1968-Stockholms universitet,Institutionen för geologi och geokemi,Department of Geology and Geochemistry, Stockholm University, Stockholm, Sweden(Swepub:liu)joyro37 (author)
Roychoudhury, Alakendra N.Department of Geological Sciences, University of Cape Town, Rondebosch 7700, South Africa (author)
Klump, J. ValDepartment of Biological Sciences and Department of Geosciences, Great Lakes WATER Institute, University of Wisconsin-Milwaukee, 600 East Greenfield Avenue, Milwaukee, WI 53204, USA (author)
Stockholms universitetInstitutionen för geologi och geokemi (creator_code:org_t)

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In:Applied Geochemistry: Elsevier BV23:8, s. 2496-25110883-29271872-9134

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NATURAL SCIENCES: NATURAL SCIENCES; and Earth and Relate ...

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By the university: Stockholm University; Linköping University

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