Chinese Journal of Geochemistry

, Volume 29, Issue 2, pp 167–174 | Cite as

Heavy metal concentrations in soils and plants in the vicinity of Arufu lead-zinc mine, Middle Benue Trough, Nigeria

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Abstract

This study focused on the influence of base metal mining on heavy metal levels in soils and plants in the vicinity of Arufu lead-zinc mine, Nigeria. Soil samples (0–15 cm depth) and plant samples were collected from cultivated farmlands in and around the mine, the unmineralized site and a nearby forest (the control site). The samples were analyzed for heavy metals (Fe, Zn, Mn, Cu, Pb, Cr and Cd) by Atomic Absorption Spectrophotometry (AAS). The physical properties of soils (pH and LOI) were also measured. Results showed that soils from cultivated farmlands have neutral pH values (6.5–7.5), and low organic matter contents (<10%). Levels of Zn, Pb and Cd in cultivated soils were higher than the concentrations obtained from the control site. These heavy metals are most probably sourced from mining and agricultural activities in the study area. Heavy metal concentrations measured in plant parts decreased in the order of rice leaves>cassava tubers>peelings. In the same plant species, metal levels decreased in the order of Zn>Fe>Mn>Cu>Pb>Cr>Cd. Most heavy metals were found in plant parts at average concentrations normally observed in plants grown in uncontaminated soil, however, elevated concentrations of Pb and Cd were found in a few cassava samples close to the mine dump. A stepwise linear regression analysis identified soil metal contents, pH and LOI as some of the factors influencing soil-plant metal uptake.

Key words

heavy metal soil plant lead-zinc mine Benue Trough Nigeria 
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Copyright information

© Science Press, Institute of Geochemistry, CAS and Springer Berlin Heidelberg 2010

Authors and Affiliations

  1. 1.Department of GeologyUniversity of CalabarCalabarNigeria
  2. 2.Formerly Department of GeologyUniversity of CalabarCalabarNigeria

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