Assessment of Heavy Metal Contamination in Soils Around Auto-Mechanic Workshops in Ozoro, Delta State, Nigeria

Auto-mechanic activities have been identified as a significant contributor to heavy metal contamination in Nigerian urban ecosystems. This study assessed the impact of such activities on soil heavy metal accumulation by analyzing 28 soil samples (labeled A, B, and C) collected from three auto-mechanic workshops, along with a control sample (D) from an uncontaminated site. Concentrations of lead (Pb), cadmium (Cd), chromium (Cr), copper (Cu), zinc (Zn), and iron (Fe) were determined through laboratory analysis and compared with established environmental quality standards. Elevated levels of copper (6.721 mg/kg), cadmium (0.228 mg/kg), and zinc (58.232 mg/kg) were observed in the sampled soils, suggesting substantial anthropogenic input, particularly from used oil spills. The persistent presence of heavy metals across all sites reflect the environmental risks associated with improper waste handling in automobile repair stations. It is recommended that appropriate containment systems, such as oil collection drums and sealed containers, be implemented to mitigate further contamination and protect soil quality.