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Journal of Analytical Methods in Chemistry
Volume 2015, Article ID 243601, 8 pages
Research Article

Assessment of Trace Metals Concentration in Tree Barks as Indicator of Atmospheric Pollution within Ibadan City, South-West, Nigeria

1Department of Chemistry, Faculty of Science and Agriculture, University of Fort Hare, PB X1314, Alice 5700, South Africa
2Department of Chemistry, Faculty of Science, University of Ibadan, Ibadan, Nigeria

Received 23 July 2015; Revised 11 September 2015; Accepted 13 September 2015

Academic Editor: Miguel de la Guardia

Copyright © 2015 Ikechukwu P. Ejidike and Percy C. Onianwa. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Tree bark species were randomly collected from 65 sites having different anthropogenic activities, such as industrial, high traffic commercial, residential high and residential low traffic volume areas of Ibadan City, Nigeria. Levels of Cd, Cu, Pb, Zn, Co, and Cr of the dry-ashed bark samples were determined by AAS. The mean metal concentrations (mg kg−1) in samples from industrial zone were found as Pb: , Cd: , Zn: , Cu: , Co: , and Cr: . The trend of mean trace metal concentrations at high traffic commercial zone follows the order: Zn > Pb > Cu > Cr > Co > Cd. Residential high traffic and low traffic zones revealed the same trend as Cd < Co < Cr < Pb < Cu < Zn. Relatively strong positive correlation between the heavy metals at , such as Zn versus Cu () and Co versus Cu (), was observed. The results of the study suggest that tree bark samples could potentially serve as bioindicators for Cu, Pb, Zn, Cr, and possibly Co and Cd. Furthermore, interspecies variation of heavy metal concentrations in plants barks is recommended.