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Journal of Fisheries and Aquatic Science
  Year: 2007 | Volume: 2 | Issue: 1 | Page No.: 63-70
DOI: 10.3923/jfas.2007.63.70
 
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Trace Metal Contents of the Emergent Macrophytes Polygonum sp.and Ludwigia sp. In Relation to the Sediments of Two Freshwater Lake Ecosystems in the Nigerian Savanna

S.P. Bako and P. Daudu

Abstract:
In industrial areas of the world the disposal of heavy metals such as mercury, cadmium, lead, copper and arsenic evokes great concern because of their increasing concentrations in many waters. This study was conducted to evaluate the metal content of the two common species of aquatic macrophytes (Polygonum sp. and Ludwigia sp.) in relation to the metal content of the sediments in Makwaye and Kubanni Lakes in the Nigerian Northern Guinea Savanna. Analysis of the elemental content of the samples was done using the Energy dispersive X-ray fluorescence Spectroscopy (XRF) method. Iron (Fe) was present at highest concentration, of 8 metals evaluated in both lakes. Titanium (Ti), Manganese (Mn), Nickel (Ni), Copper (Cu), Zinc (Zn) and Arsenic (As) followed in that order. Significantly, lead (Pb) was not recorded in the sediments of any of the two lakes. Concentrations of all the metals in the sediments of both lakes, as well as plant shoots were higher than levels internationally regarded as normal. Accumulation patterns for the trace metals in plants were in the order Fe>Ti>Mn>Cu. Ni, Zn, As and Pb were not detected in the shoot tissues of either species, although all (except Pb) were present in the sediments. Between 45-100% Mn found in the sediments of the two lakes was found in the shoots of the two plant species, while for Cu this was 31-34%, Ti (15-42%) and Fe (7-21%). On the whole accumulation patterns of metals in plant shoots suggested a trend that reflects the level of toxicity of the metals to plant tissues, with Fe, Ti, Mn and Cu following in that order. Implications of these findings in relation to biocontamination of the food chain and possibilities for phytoremediation are discussed.
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How to cite this article:

S.P. Bako and P. Daudu, 2007. Trace Metal Contents of the Emergent Macrophytes Polygonum sp.and Ludwigia sp. In Relation to the Sediments of Two Freshwater Lake Ecosystems in the Nigerian Savanna. Journal of Fisheries and Aquatic Science, 2: 63-70.

DOI: 10.3923/jfas.2007.63.70

URL: https://scialert.net/abstract/?doi=jfas.2007.63.70

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