Show simple item record Nkoane, B.B.M. Sawula, G.M. Wibetoe, G. Lund, W. 2010-06-25T10:24:01Z 2010-06-25T10:24:01Z 2005
dc.identifier.citation Nkoane, B.B.M. et al (2005) Identification of Cu and Ni indicator plants from mineralised locations in Botswana, Journal of Geochemical Exploration, Vol. 86, pp. 130–142 en_US
dc.identifier.issn 0375-6742
dc.description.abstract Plant species that accumulate high levels of metals in proportion to the metal content in the soil are of considerable interest in biogeochemical and biogeobotanical prospecting. This study was aimed at investigating copper and nickel accumulation in the plants Helichrysum candolleanum and Blepharis diversispina, to assess their potential use as mineral indicators in biogeochemical prospecting. Soils and plants were collected from copper–nickel mineralised areas in Botswana. Analyses of the soils and the respective plant parts (roots, stem, leaves and flowers) were carried out using ultrasonic slurry sampling electrothermal atomic absorption spectrometry (ETAAS), which allowed rapid determination of copper and nickel in small amounts of the samples. The metal concentration in the soil was in the range c40 Ag/g–4% (w/w) for Cu and c60 Ag/g–0.3% (w/w) for Ni. The concentration ranges of the elements in the plant parts were c6 Ag/g–0.2% Cu and c3–210 Ag/g Ni. At high soil metal content (greater than 2.5% (w/w) Cu and 0.1% (w/w) Ni), high levels of both nickel and copper were found in the shoots (leaves and flowers) of H. candolleanum. Concentrations as high as 0.2% (w/w) Cu were found in the leaves and flowers of H. candolleanum, indicating hyperaccumulation for this plant. For B. diversispina, the metal concentrations did not exceed 100 Ag/ g for any plant part, for both metals. Both plant species tolerate high concentrations of metals and should therefore be categorized as metallophytes. In order to evaluate metal translocation from the soil to the shoots, metal leaf transfer coefficients (ratio of metal concentration in the leaf to metal concentration in the soil) were calculated. Our data suggest that the two plant species have different metal uptake and transport mechanisms, which needs to be investigated further. The present work also suggests that H. candolleanum may be used as a copper/nickel indicator plant in biogeochemical or biogeobotanical prospecting. en_US
dc.language.iso en en_US
dc.publisher Elsevier en_US
dc.subject Helichrysum candolleanum en_US
dc.subject Blepharis diversispina en_US
dc.subject Copper en_US
dc.subject Nickel en_US
dc.subject Indicator plants en_US
dc.subject Metallophytes en_US
dc.title Identification of Cu and Ni indicator plants from mineralised locations in Botswana en_US
dc.type Published Article en_US

Files in this item

This item appears in the following Collection(s)

Show simple item record


Advanced Search


My Account