Multi-Index Ecological Risk Evaluation of Heavy Metal Contamination in Agricultural Soils Influenced by Auto-Mechanic Activities in Anyigba, Nigeria

Authors

  • C. B. Okpanachi
    Department of Industrial Chemistry, Federal University of Applied Sciences, Kachia, Kaduna State, Nigeria
  • C. C. Onoyima
    Department of Chemistry, Nigeria Police Academy, Wudil, Kano State, Nigeria
  • L. Ekwoba
    Department of Pure and Industrial Chemistry, Prince Abubakar Audu University, Anyigba, Kogi State, Nigeria
  • R. Larayetan
    Department of Pure and Industrial Chemistry, Prince Abubakar Audu University, Anyigba, Kogi State, Nigeria
  • E. M. Ameh
    Department of Pure and Industrial Chemistry, Prince Abubakar Audu University, Anyigba, Kogi State, Nigeria
  • E. Abalaka
    Department of Pure and Industrial Chemistry, Prince Abubakar Audu University, Anyigba, Kogi State, Nigeria
  • E. Ejukwa
    Department of Pure and Industrial Chemistry, Prince Abubakar Audu University, Anyigba, Kogi State, Nigeria

Keywords:

Agricultural Soils , Anthropogenic Pollution , Heavy Metals , Environmental Risk Indices , Soil Quality Degradation

Abstract

This study evaluated the influence of auto-mechanic workshops on the physicochemical properties, heavy metal levels, and pollution status of adjacent farmland soils in Anyigba, Kogi State. Soil pH ranged from 5.2– 6.5, reflecting slight acidification relative to the control (6.8). Electrical conductivity increased to 0.45–1.12 dS/m compared to 0.37 dS/m in the control. Soil organic carbon declined to 0.67–1.83% compared with control’s 3.24%, while cation exchange capacity decreased to 4.56–10.38 cmol/kg compared with 16.83 cmol/kg in the control, indicating reduced nutrient retention capacity. Heavy metal concentrations were markedly elevated, reaching 18.97 mg/kg (Pb), 11.09 mg/kg (Cu), 11.22 mg/kg (Ni), 12.16 mg/kg (Cr), and 2.87 mg/kg (Cd), exceeding control values of 0.83, 1.66, 3.58, 4.76, and 0.27 mg/kg, respectively. Contamination factors (CF) indicated high contamination for Pb (3.95–22.86), Cd (4.37–10.63), and Cu (3.05–6.68), and moderate contamination for Ni (1.93–3.13) and Cr (1.39–2.55). Enrichment factors (EF) showed minimal enrichment for Ni (0.88–1.93) and moderate to significant enrichment for Cd (2.16–5.13), Cu (1.26–3.22), and Pb (2.52–11.00). The Nemerow Pollution Index (3.67–17.77) classified the soils as heavily polluted. The Potential Ecological Risk Index (179.23–480.39) indicated moderate to considerable ecological risk, largely driven by Cd and Pb. Overall, the findings confirm substantial anthropogenic metal inputs from auto-mechanic activities and underscore the need for improved waste management, routine monitoring, phytoremediation strategies, and strengthened regulatory enforcement to prevent food chain contamination.

Dimensions

Kakpu, O. J., Okoye, P. A. C., & Onuegbu, T. U. (2024). Chemical fractionation and mobility factor of some heavy metals in refuse dumpsite soil in Awka Metropolis, Anambra State, Nigeria. Chemical Reports, 5(1), 268–274. https://doi.org/10.25082/CR.2024.01.001

Daniel, D. O., Udofia, I. M., Agwo, M. U. and Asiwe, T. N. (2025). Evaluation of heavy metals contamination from automobile workshops in Uyo Local Government Area, Akwa Ibom State. Journal of Materials and Environmental Science, 16(1), 102–111. http://www.jmaterenvironsci.com

El- Hassanin, A. S., Habashy, N. R., Samak, M. R., Elwa, A., & Shouman, H. A. (2022). Chemical fractionation of some heavy metals in soils irrigated from El-Saff wastewater drainage canal, Egypt. Water Science, 36(1), 60–69. https://doi.org/10.1080/23570008.2022.2053928

Olisa, O. G., Hashimi, A. M., Olatunji, O. T., Keyede, O. M., & Ajayi, O. A. (2024). Potentially toxic elements concentration and distribution in soils around artisan workshops in Ago-Iwoye, Southwestern Nigeria. Journal of Trace Elements and Minerals, 9, 100168.

Obunwo, C. C., Ubah, S. C., Bull, O. S., & Amaibi, P. M. (2024). Solid-phase fractionation of heavy metal ions in soils from municipal waste dumpsite in Port Harcourt, Nigeria. Journal of the Chemical Society of Nigeria, 49(1), 1 – 15

Ogarekpe, N. M., Nnaji, C. C., Oyebode, O. J., Ekpenyong, M. G., Ofem, O. I., Tenebe, I. T., & Asitok, A. D. (2023). Groundwater quality index and potential human health risk assessment of heavy metals in water: A case study of Calabar metropolis, Nigeria. Environmental Nanotechnology, Monitoring & Management, 19, 100780. https://doi.org/10.1016/j.enmm.2023.100780

Ore, O. T., Akhigbe, G. E., Adegunwa, A. O., Olalekan, E. O., Ayeni, D. A., Omirin, O. M., & Adebiyi, P. E. (2019). Total and chemical speciation analyses of potential toxic metals in refuse dumpsite soils. World Journal of Applied Chemistry, 4(2), 19–29. https://doi.org/10.11648/j.wjac.20190402.12

Chen, H., Wang, L., Hu, B., Xu, J., & Liu, X. (2022). Potential driving forces and probabilistic health risks of heavy metal accumulation in the soils from an e-waste area, southeast China. Chemosphere, 289, 133182. https://doi.org/10.1016/j.chemosphere.2021.133182

Adebiyi, F. M., & Ayeni, D. A. (2022). Chemical speciation, bioavailability and risk assessment of potentially toxic metals in soils around petroleum product marketing company as environmental degradation indicators. Petroleum Research, 7(2), 286–296. https://doi.org/10.1016/j.ptlrs.2021.06.001

Agyemang, J., Gyimah, E. and Ofori, P. (2022). Pollution and health risk implications of heavy metals in the surface soil of Asafo auto-mechanic workshop in Kumasi, Ghana. Chemistry Africa, 5, 189–199. https://doi.org/10.1007/s42250-021-00297-x

Rouhani, A., Shadloo, S. and Naqibzadeh, A. (2023). Pollution and health risk assessment of heavy metals in the soil around an open landfill site in a developing country (Kazerun, Iran). Chemistry Africa, 6, 2139–2149. https://doi.org/10.1007/s42250-023-00616-4

Enete, U. O., Ekwuonu, A. M., and Osunwa, C. P. (2022). Heavy metal contamination of soils and vegetation around automobile workshops in Owerri Metropolis. World News of Natural Sciences, 40, 65–85.

Awad, M., Liu, Z., Skalicky, M., Dessoky, E. S., Brestic, M., Mbarki, S., Rastogi, A., & EL Sabagh, A. (2021). Fractionation of Heavy Metals in Multi-Contaminated Soil Treated with Biochar Using the Sequential Extraction Procedure. Biomolecules, 11(3), 448. https://doi.org/10.3390/biom11030448

Amaechi, M., & Onwuka, S. U. (2021). Determination of the presence and level of heavy metals in soils of automobile workshops in Awka, Anambra State. International Journal of Environment and Pollution Research, 9(3), 18–32. https://ssrn.com/abstract=3935194

Ekpe, J. E., Okpoji, A. U., Ekwere, I. O., Anarada, C. J., Ewuola, A. A., Ufuoma, V. O., Okpanachi, C. B. and Obunezi, O. A. (2025). Physico-chemical transport of pesticides and nutrients in irrigation water and their fate in agro-ecosystems of Rivers State, Nigeria. Palgo Journal of Agriculture, 9(2), 30-37.

Okpanachi, C. B., Haruna, J., Onoyima, C., Attah, E. S., Abalaka, E., Ameh, E. M., & Ejukwa, E. (2025). Chemical Speciation, Bioavailability and Multi-Index Assessment of Heavy Metal Contamination in Dumpsite-Affected Farmland Soils of Anyigba, Nigeria. Journal of Science Research and Reviews, 2(5), 83-97. https://doi.org/10.70882/josrar.2025.v2i5.113

Mosley, L. M. (2024). Soil pH and its influence on trace element bioavailability: A global review. European Journal of Soil Science, 75(1), 21–34. https://doi.org/10.1111/ejss.70021

Chatziparaschis, A., Ahmad, F., and Lee, J. H. (2023). Integration of proximal sensors and AI for monitoring soil salinity and conductivity. Applied Biological Chemistry, 66(2), 105–115. https://doi.org/10.1186/s13765-023-00849-4

Khumalo, N., and Moodley, M. (2023). Evaluation of soil organic carbon dynamics in relation to trace metal retention in amended soils. Environmental Monitoring and Assessment, 195(3), 456. https://doi.org/10.1007/s10661-023-11592-2

Kilinc, M., & Orhan, Y. (2025). Improved hydrometer-based soil texture analysis using machine learning correction for ionic interferences. Soil and Tillage Research, 230, 105062. https://doi.org/10.1016/j.still.2024.105062

Antonangelo, J. A., and Adeoye, G. O. (2024). Comparative evaluation of soil cation exchange capacity using ammonium acetate and compulsive exchange methods. Frontiers in Soil Science, 3, 1371777. https://doi.org/10.3389/fsoil.2024.1371777

Arshad, M. A. and Ibrahim, M. (2022). Comparative assessment of gravimetric and dielectric methods for determining soil moisture in tropical regions. Sustainability, 14(18), 11538. https://doi.org/10.3390/su141811538

Adesuyi, A. A., Osemwegie, A. A., & Ogunyebi, D. Y. (2023). Soil chemical properties and heavy metals around mechanic workshops in southwestern Nigeria. Environmental Earth Sciences, 82(2), 88–95. https://doi.org/10.1007/s12665-023-10981-x

Agbaji, A. B., Akande, M. B., & Adeoye, A. A. (2023). Soil moisture and organic matter variability in hydrocarbon-impacted mechanic village soils. Nigerian Journal of Soil and Environmental Research, 23(1), 15–23.

Edeh, E. A. and Adebayo, T. M. (2022). Influence of soil texture on trace metal accumulation in mechanic village soils. African Journal of Environmental Management, 29(3), 34–42.

Duniya, H. T., Sulaiman, M. A., & Mohammed, I. Y. (2023). Electrical conductivity and salinity effects of auto-mechanic effluents on urban soils. Nigerian Journal of Soil Science, 34(2), 45–53.

Amadi, J. E., Ifeanyi, U., & Ogundele, T. E. (2023). Soil organic carbon decline in waste-polluted agricultural soils. African Journal of Agricultural and Environmental Research, 17(2), 75–84.

Aluko, A. O., & Oyetunji, A. O. (2024). Cation exchange dynamics in soils near mechanic workshops in Ibadan, Nigeria. West African Journal of Soil and Water Research, 8(1), 29–38.

Okpanachi, C. B., Agbaji, E. B. and Omensa H. Z. (2016). Assessment of Selected Heavy Metal Level in Soil and Maize (Zea mays) Plant within the Vicinity of Auto Mechanic Workshops in Gwagwalada, Abuja, Nigeria. International Journal of Plant & Soil Science 12(2): 1-11

Ekwere, I. O., Okpoji, A. U., Igwegbe, K. C., Okonkwo, C. O., Yekeen, A. A., Obunezi, O. C., Okpanachi, C. B., Garuba, M. H., Ogini, O. R., & Odibo, U. E. (2025). Nutritional–Toxicological Trade-Off: Comparative Study of Polycyclic Aromatic Hydrocarbons in Smoked and Oven-Dried Nile Tilapia (Oreochromis niloticus). Journal of Environment, Climate, and Ecology, 2(2), 90-97. https://doi.org/10.69739/jece.v2i2.952

Okagbare, U. V., Umueni, U. E., Ekpe, J. E., Etukudo, N. J., Okpoji, A. U., Okoye, P. I., Ekwere, I. O., Etesin, M. U., Okpanachi, C. B., & Okafor, C. A. (2025). Geophysical and Hydrochemical Assessment of Groundwater Vulnerability to Oil Pollution in Yenagoa, Bayelsa State, Nigeria. Journal of Environment, Climate, and Ecology, 2(2), 138-146. https://doi.org/10.69739/jece.v2i2.1078

Okpoji, A. U., Ekwere, I. O., Igwegbe, K. C., Etesin, U. M., Ugwuanyi, G. C., Okpanachi, C. B., Ewuola, A. A., Mojisola, K. M., & Ezekwueme, O. I. (2025). Solar-Enhanced Photocatalytic Degradation of Pharmaceutical Residues in Wastewater Using Fe-, Cu-, and Zn- Doped TiO₂ Nanomaterials. Journal of Environment, Climate, and Ecology, 2(2), 56-62. https://doi.org/10.69739/jece.v2i2.961

Onoyima, C. C., Okpanachi, C. B., and Akoji, J. N. (2025). Hydro-geochemical Characterization and Groundwater Quality Assessment of Mariri Aquifer, Kano, Nigeria. Journal of Agriculture and Environment for International Development (JAEID), 119(1), 469–486. https://doi.org/10.36253/jaeid-17814

Okpoji, U. A., Etesin, M. U., Ekwere, I. O., Martins, N. P., Okpanachi, C. B., Adisa, O. J., and Okonkwo, C. C. (2025). Geochemical Speciation and Ecological Risk of Heavy Metals in Estuarine Sediments of the Qua Iboe River, Nigeria. Asian Journal of Chemical Sciences 15 (6):20-31. https://doi.org/10.9734/ajocs/2025/v15i6402.

Okpanachi, C. B., Enemali, K., Sale, F., Ameh, M. E., Ejukwa E. and Salihu, A. A. (2025). Multi-Index Assessment of Heavy Metals in Agricultural Soils near Waste Dumpsites in Egume, Kogi State, Nigeria. ChemClass Journal, 9 (3) 239 – 262.

Irfan, M., Shafeeq, A., Siddiq, U., Bashir, F., Ahmad, T., Athar, M., Butt, M. T., Ullah, S., Mukhtar, A., Hussien, M., & Lam, S. S. (2022). A mechanistic approach for toxicity and risk assessment of heavy metals, hydroquinone, and microorganisms in cosmetic creams. Journal of Hazardous Materials, 433, 128806. https://doi.org/10.1016/j.jhazmat.2022.128806

Ibrahim, T. A., Olanrewaju, R. F. and Adetunji, A. T. (2024). Variability of cation exchange capacity and its role in heavy metal immobilization across soils of Southwestern Nigeria. Scientific African, 16, e01872. https://doi.org/10.1016/j.sciaf.2024.e01872

Ajibade, T. F., Oladipo, M. O. A., & Yusuf, K. A. (2022). Assessment of heavy metal contamination and ecological risks in agricultural soils impacted by municipal solid waste in Nigeria. Environmental Nanotechnology, Monitoring & Management, 18, 100690. https://doi.org/10.1016/j.enmm.2022.100690

Alhassan, H., Suleiman, I., & Musa, S. (2023). Influence of soil texture and organic matter on heavy metal retention near municipal dumpsites in Northern Nigeria. Journal of Soils and Sediments, 23(5), 2143–2158. https://doi.org/10.1007/s11368-023-03471-0

Fulke, A. B., Ratanpal, S., and Sonker, S. (2024). Understanding heavy metal toxicity: Implications on human health, marine ecosystems, and bioremediation strategies. Marine Pollution Bulletin, 206, 116707. https://doi.org/10.1016/j.marpolbul.2024.116707

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Published

2026-04-06

How to Cite

Multi-Index Ecological Risk Evaluation of Heavy Metal Contamination in Agricultural Soils Influenced by Auto-Mechanic Activities in Anyigba, Nigeria. (2026). Lafia Journal of Scientific and Industrial Research, 4(1), 115-123. https://doi.org/10.62050/ljsir2026.v4n1.760

Issue

Volume 4, Issue 1 (April, 2026), Lafia Journal of Scientific and Industrial Research (LJSIR)

Section

Physical Sciences
Copyright & Licensing

Copyright (c) 2026 C. B. Okpanachi, C. C. Onoyima, L. Ekwoba, R. Larayetan, E. M. Ameh, E. Abalaka, E. Ejukwa (Author)

Creative Commons License

This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.

How to Cite

Multi-Index Ecological Risk Evaluation of Heavy Metal Contamination in Agricultural Soils Influenced by Auto-Mechanic Activities in Anyigba, Nigeria. (2026). Lafia Journal of Scientific and Industrial Research, 4(1), 115-123. https://doi.org/10.62050/ljsir2026.v4n1.760

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