Seasonal variations in heavy metals concentrations in Chromolaena odorata (L.) King & Robinson foliage and soil at a solid waste dump site in Osun State, Nigeria

Albert C. Achudume, Jacob T. Olawale


Variations in Fe, Pb, Cd, Cr, and Cu concentrations in Chromolaena odorata foliage and soil from a waste dumping site in Nigeria were determined. The data showed that all metals present in the sediments were represented in the foliage too. There were, however, significant variations in the concentrations of various metals at different sites, perhaps due to differences in land gradient. Generally higher values were noted in the wet season than in dry season. The average concentrations of Pb in the sediment (6.04±0.01 μg•g–1 in dry season and 7.2±0.05 μg•g–1 during wet season) were lower than the values observed for other metals like Fe (122±10.68 μg•g–1 in dry season and 146±0.44 μg•g–1 in wet season) and Cd (8.56±0.05 μg•g–1 in dry season and 10.8±0.00 μg•g–1 in wet season). A significant deduction from this study is that plant tissues generally increase heavy metal contamination with increasing levels of contaminants in the waste and could be an entry port of heavy metals in the food chain. The important interactive roles of C. odorata in waste site may therefore provide information for heavy metal decontamination.


Bioaccumulation; Heavy metal contamination; Seasonal variations.

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A KAU publication [CODEN: JTAGEI; ISSN 0971-636X; eISSN 0973-5399]