Concentrations of Arsenic, Copper, Cobalt, Lead and Zinc in Cassava (Manihot esculenta Crantz) Growing on Uncontaminated and Contaminated Soils of the Zambian Copperbelt

Concentrations of Arsenic, Copper, Cobalt, Lead and Zinc in Cassava (Manihot esculenta Crantz) Growing on Uncontaminated and Contaminated Soils of the Zambian Copperbelt

Author: 
Kríbek, B.
Publisher: 
Elsevier
Date published: 
2014
Record type: 
Responsibility: 
Majer, V., jt. author
Knésl, I., jt. author
Nyambe, I., jt. author [etal]
Journal Title: 
Journal of African Earth Sciences
Source: 
Journal of African Earth Sciences, Vol 99, Part 2,November 2014, pp. 713-723
Abstract: 

The concentrations of arsenic (As), copper (Cu), cobalt (Co), lead (Pb) and zinc (Zn) in washed leaves and washed and peeled tubers of cassava (Manihot esculenta Crantz, Euphorbiaceae) growing on uncontaminated and contaminated soils of the Zambian Copperbelt mining district have been analyzed. An enrichment index (EI) was used to distinguish between contaminated and uncontaminated areas. This index is based on the average ratio of the actual and median concentration of the given contaminants (As, Co, Cu, mercury (Hg), Pb and Zn) in topsoil. The concentrations of copper in cassava leaves growing on contaminated soils reach as much as 612 mg kg-1 Cu (total dry weight [dw]). Concentrations of copper in leaves of cassava growing on uncontaminated soils are much lower (up to 252 mg kg-1 Cu dw). The concentrations of Co (up to 78 mg kg-1 dw), As (up to 8 mg kg-1 dw) and Zn (up to 231 mg kg-1 dw) in leaves of cassava growing on contaminated soils are higher compared with uncontaminated areas, while the concentrations of lead do not differ significantly. The concentrations of analyzed chemical elements in the tubers of cassava are much lower than in its leaves with the exception of As.

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CITATION: Kríbek, B.. Concentrations of Arsenic, Copper, Cobalt, Lead and Zinc in Cassava (Manihot esculenta Crantz) Growing on Uncontaminated and Contaminated Soils of the Zambian Copperbelt . : Elsevier , 2014. Journal of African Earth Sciences, Vol 99, Part 2,November 2014, pp. 713-723 - Available at: http://library.au.int/concentrations-arsenic-copper-cobalt-lead-and-zinc-cassava-manihot-esculenta-crantz-growing