ASSESSMENT OF AUTOMOBILE-DERIVED HEAVY METAL CONTAMINATION IN ROADSIDE SOILS ALONG MAJOR HIGHWAYS IN BENIN CITY, NIGERIA.
DOI:
https://doi.org/10.5281/Keywords:
Heavy metal contamination, Roadside soils, Vehicular emissions, Environmental pollution, Public health risk, Benin CityAbstract
This study assessed automobile-derived heavy metal contamination in roadside soils along major highways in Benin City to determine the concentration, spatial distribution, and environmental implications of selected heavy metals associated with vehicular activities. Twenty-one roadside soil samples were collected from seven major road corridors: Benin-Auchi Road, Benin-Lagos Road, Benin-Asaba Road, Benin Bypass Road, Benin-Warri Road, Boundary Road, and Etete Road during morning, afternoon, and evening periods. Laboratory analyses were carried out using Atomic Absorption Spectrophotometry (AAS) and Inductively Coupled Plasma Mass Spectrometry (ICP-MS) to determine concentrations of vanadium (V), lead (Pb), nickel (Ni), cadmium (Cd), zinc (Zn), manganese (Mn), iron (Fe), and chromium (Cr). Results showed that vanadium recorded the lowest concentration, ranging from 0.187–0.365 mg/kg, while zinc had the highest concentration, ranging from 308.6–636.5 mg/kg. Lead concentrations ranged from 20.68–40.59 mg/kg and exceeded the permissible limit of 10 mg/kg in all sampled locations. Cadmium and chromium concentrations also exceeded recommended environmental standards across the study area. Benin-Asaba Road recorded the highest concentrations of most heavy metals, especially during the evening period, indicating the influence of traffic density and vehicular emissions. Heavy Metal Pollution Index analysis revealed severe contamination levels, with cadmium and lead contributing the highest pollution values. The study concludes that roadside soils in Benin City are significantly contaminated by traffic-related heavy metals, posing ecological and public health risks. Regular environmental monitoring and stricter vehicular emission control measures are recommended.
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Adamu, A. A., Ibrahim, A. T., & Musa, S. D. (2022). Assessment of heavy metal contamination in roadside soils along major traffic corridors in Kano Metropolis, Nigeria. Environmental Monitoring and Assessment, 194(6), 1–15. https://doi.org/10.1007/s10661-022-10045-8
Adelekan, B. A., & Abegunde, K. D. (2011). Heavy metal contamination of urban soils in Nigeria: A case study of roadside soils in Lagos metropolis.International Journal of Physical Sciences, 6(5), 1045–1058.
Akan, J. C., Abdulrahman, F. I., Sodipo, O. A., & Chiroma, Y. A. (2021). Distribution of heavy metals in roadside soils and urban dust associated with traffic activities in Nigerian cities. Journal of Environmental Chemistry and Ecotoxicology, 13(2), 45–56.
Akinsete, O. O., & Olatimehin, O. O. (2023). Traffic-related heavy metal contamination and ecological risk assessment of roadside soils in southwestern Nigeria. Environmental Challenges, 12, 100682. https://doi.org/10.1016/j.envc.2023.100682
Akinsete, S. J., & Olatimehin, A. D. (2024). Priority polycyclic aromatic hydrocarbons and heavy metals in urban roadside soils of heavy-traffic density areas in Ibadan, Nigeria: Levels, sources and health risk assessment.Environmental Forensics, 25(4), 239-253.
Akinsete, S. J., & Olatimehin, A. D. (2024). Priority polycyclic aromatichydrocarbons and heavy metals in urban roadside soils of heavy-traffic density areas in Ibadan, Nigeria: Levels, sources and health risk assessment. Environmental Forensics, 25(4), 239-253.
Alloway, B. J. (2013). Heavy metals in soils: Trace metals and metalloids in soils and their bioavailability (3rd ed.). Springer. https://doi.org/10.1007/978-94-007 4470-7
Angon, P. B., Islam, M. S., Das, A., Anjum, N., Poudel, A., & Suchi, S. A. (2024). Sources, effects and present perspectives of heavy metals contamination: Soil, plants and human food chain. Heliyon, 10(7).
Bellinger, D., Leviton, A., Waternaux, C., Needleman, H., & Rabinowitz, M. (1987). Longitudinal analyses of prenatal and postnatal lead exposure and early cognitive development. New England journal of medicine, 316(17), 1037 1043.
Charlesworth, S., De Miguel, E., & Ordóñez, A. (2011). A review of the distribution of particulate trace elements in urban terrestrial environments and its application to considerations of risk. Environmental Geochemistry and Health, 33(2), 103–123. https://doi.org/10.1007/s10653-010-9325-7
Famuyiwa, A. O., Adebola, A. A., & Yusuf, K. A. (2022). Heavy metal contamination and ecological risk assessment of urban roadside soils and dust in Lagos, Nigeria. Environmental Nanotechnology, Monitoring & Management, 18, 100694. https://doi.org/10.1016/j.enmm.2022.100694
Grigoratos, T., & Martini, G. (2015). Non-exhaust traffic related emissions: Brake and tyre wear PM. Publications Office of the European Union. https://doi.org/10.2788/177990
Idebaneria, K. O. (2025). Traffic Congestion And Environmental Sustainability In Benin Metropolis, Edo State, Nigeria. Sokoto Journal of Geographical Studies, 2(1), 28-28.
Islam, S., Ahmed, K., Habibullah-Al-Mamun, M., & Masunaga, S. (2015). Potential ecological risk of hazardous elements in different land-use urban soils of Bangladesh.Science of the Total Environment, 512–513, 94–102. https://doi.org/10.1016/j.scitotenv.2014.12.100
Jaishankar, M., Tseten, T., Anbalagan, N., Mathew, B. B., & Beeregowda, K. N. (2022). Toxicity, mechanism and health effects of some heavy metals. Interdisciplinary Toxicology, 7(2), 60–72. https://doi.org/10.2478/intox-2014 0009
Kumar, P., Singh, R., & Sharma, M. (2024). Traffic-related non-exhaust emissions and heavy metal contamination in urban roadside environments: A global review. Science of the Total Environment, 912, 169221. https://doi.org/10.1016/j.scitotenv.2023.169221
Liang, J., Feng, C., Zeng, G., Gao, X., Zhong, M., Li, X., Li, X., & He, X. (2019). Spatial distribution and source identification of heavy metals in surface soils in a typical urban area of China. Journal of Geochemical Exploration, 189, 141–149. https://doi.org/10.1016/j.gexplo.2018.03.004
Liu, Y., Zhang, H., Wang, X., & Chen, J. (2025). Source apportionment and spatial variability of traffic-related heavy metals in roadside urban soils. Environmental Research, 258, 119874. https://doi.org/10.1016/j.envres.2024.119874
Luo, X., Yu, S., Li, H., & Zhang, Y. (2023). Global patterns and drivers of heavy metal accumulation in urban soils: A meta-analysis. Environmental Pollution, 324, 121313. https://doi.org/10.1016/j.envpol.2023.121313
Melebary, S. J. (2023). Heavy metal toxicity and remediation in human and agricultural systems: A review. Advances in Animal and Veterinary Sciences, 11(4), 679-694.
Muoghalu, J. I. (2025). Spatial distribution and ecological implications of heavy metals in roadside soils of southeastern Nigeria. African Journal of Environmental Science and Technology, 19(1), 34–48.
Naz, M., Dai, Z., Hussain, S., Tariq, M., Danish, S., Khan, I. U., ... & Du, D. (2022). The soil pH and heavy metals revealed their impact on soil microbial community. Journal of Environmental Management, 321, 115770.
Obasi, P. N., & Akudinobi, B. B. (2020). Potential health risk and levels of heavy metals in soils from automobile workshops and highways in southeastern Nigeria. Environmental Analysis, Health and Toxicology, 35(1), e2020007. https://doi.org/10.5620/eaht.e2020007
Ogundele, D. T., Adio, A. A., & Oludele, O. E. (2022). Heavy metal concentrations in roadside soils and ecological risk assessment in Port Harcourt metropolis, Nigeria. Environmental Monitoring and Assessment, 194(4), 267–281. https://doi.org/10.1007/s10661-022-09981-6
Okafor, C. C., Ezeh, G. C., & Nwankwo, C. F. (2025). Vehicular activities and heavy metal contamination of roadside soils in Lagos metropolis, Nigeria. Environmental Monitoring and Assessment, 197(3), 215–229. https://doi.org/10.1007/s10661-025-12456-1
Okunola, O. J., Uzairu, A., Ndukwe, G. I., & Adewusi, S. R. A. (2023). Human health risk assessment of heavy metals in roadside soils and dust from selected Nigerian urban highways. Ecological Indicators, 146, 109876. https://doi.org/10.1016/j.ecolind.2022.109876
Olayinka, O. O., Adeyemi, A. A., & Oladipo, O. G. (2023). Assessment of traffic induced heavy metal contamination in roadside soils of selected Nigerian urban centres. Heliyon, 9(5), e15948. https://doi.org/10.1016/j.heliyon.2023.e15948
Shingirirai, M., Chikodzi, D., & Nhapi, I. (2022). Heavy metal contamination in African urban soils: Sources, distribution and environmental implications. Environmental Advances, 8, 100245. https://doi.org/10.1016/j.envadv.2022.100245
Tchounwou, P. B., Yedjou, C. G., Patlolla, A. K., & Sutton, D. J. (2012). Heavy metal toxicity and the environment. EXS, 101, 133–164. https://doi.org/10.1007/978 3-7643-8340-4_6
Wallington, T. J., Anderson, J. E., Dolan, R. H., & Winkler, S. L. (2022). Vehicle emissions and urban air quality: 60 years of progress. Atmosphere, 13(5), 650.
Wei, B., & Yang, L. (2010). A review of heavy metal contaminations in urban soils, urban road dusts and agricultural soils from China. Microchemical Journal, 94(2), 99–107. https://doi.org/10.1016/j.microc.2009.09.014
Wuana, R. A., & Okieimen, F. E. (2011). Heavy metals in contaminated soils: A review of sources, chemistry, risks and best available strategies for remediation. ISRN Ecology, 2011, 1–20. https://doi.org/10.5402/2011/402647
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