Accumulation patterns of Cu and Ni for Indigofera melanadenia and Tephrosia longipes plant species growing in Cu-Ni mining area in Botswana

作者：Mogopodi Dikabo^*; Mosetlha Kabo; Torto Nelson; Wibetoe Grethe

来源：Journal of Geochemical Exploration, 2008, 97(1): 21-28.

DOI：10.1016/j.gexplo.2007.09.002

• Indigofera melanadenia
• Tephrosia longipes
• metals
• accumulation

Indigofera melanadenia and Tephrosia longipes plant species, collected from Cu-Ni mining area, were evaluated for accumulation of Cu and Ni. The total and bioavailable concentrations of Cu and Ni in the host soils were also determined. Flame Atomic Absorption Spectrometry was used for all metal determinations. The total and bioavailable concentrations of Cu in the soils were in the range 900-9000 mu g/g and 200-2000 mu g/g respectively. For Ni, the total and bioavailable concentrations were in the range 900-2000 mu g/g and similar to 40-100 mu g/g respectively. The concentrations of Cu and Ni in the leaves oft melanadenia were higher than in the roots with a range 80-130 mu g/g in the leaves and 20-80 mu g/g in the roots for Cu and a range of 150-200 mu g/g in the leaves and 20-60 mu g/g in the roots for Ni. Concentration of Cu in T longipes was in the range of 37-240 mu g/g and 150-200 mu g/g in the leaves and roots respectively while the concentration of Ni was 80-140 mu g/g in the leaves and 25-100 mu g/g in the roots. Results indicate that both species have a potential for accumulating Cu and Ni. Translocation factor, a ratio of shoots to roots metal concentration, was used to evaluate the translocation properties of the plants from roots to shoots. Translocation factors of the plants were >= 1 suggesting efficient trunslocation of metals from roots to shoots.

• 出版日期2008-4