In this study, landfill leachates and plants from Olusosun landfill in Ojota area of Lagos State, Nigeria were investigated. Physicochemical parameters, concentrations of heavy metals (HMs -Pb, Cd, Cr, Ni, Mn and Zn) and polycyclic aromatic hydrocarbons (PAHs) were determined in leachates while HMs and PAHs were determined in plants. Nitric and Perchloric acid mixtures were used for digesting both leachates and plant samples before quantification by atomic absorption spectrometry. Cold extraction was used for extracting PAHs and was quantified using gas chromatography-mass spectrometry. The range of results on HMs analysis were:
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