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Heavy metal concentration in soil and woody plants in a quarry

This study determined the concentration of three heavy metals zinc (Zn), lead (Pb), and cadmium (Cd) in soil and in a woody plant species, Milicia excelsa, at Ishiagu quarry, Nigeria. The highest soil concentrations of Zn, Pb, and Cd in soil were obtained at 1 m from the quarry site. In M. excelsa, the highest concentrations of Zn, Pb, and Cd were 3.12–9.1, 3.9–6.01, and 0.51–1.12 mg kg−1, respectively. There were significant positive correlations between Cd and Zn (r = 0.963) and Cd and Pb (r = 0.974) in plants as well as between Cd and Pb (r = 9.84) in soil. The level of Cd in soil reflected significant pollution compared to average global concentrations in soils.