Geo-Environmental Risk Assessment of Abandoned Petrol Stations in Essien Udim Local Government Area, Akwa Ibom State

This study examines the contamination of soils and groundwater around abandoned petrol stations in Akwa Ibom State, Nigeria, the study further evaluate associated environmental and health risks. Six sites were purposively selected, and samples were analyzed for pH, Total Petroleum Hydrocarbons (TPH), lead (Pb), nickel (Ni), and benzene using standard APHA and ASTM procedures. Descriptive statistics and Pearson correlation were applied to quantify pollutant relationships. Results shows that, mean soil TPH (1575 ± 510 mg/kg) exceeded the DPR limit (100 mg/kg), indicating severe hydrocarbon pollution. Mean Pb (40.22 ± 11.7 mg/kg) and Ni (29.18 ± 9.3 mg/kg) were below regulatory limits but reflected anthropogenic influence. Groundwater TPH (0.048 ± 0.02 mg/L) and benzene (0.017 ± 0.009 mg/L) exceeded WHO limits (0.05 mg/L;0.01 mg/L). Significant correlations existed between TPH and Pb (r = 0.87) and between benzene and Ni (r = 0.76). Findings highlight hydrocarbon metal co-contamination and potential groundwater migration, necessitating remediation and continuous monitoring.

Abandoned petrol stations, Benzene, Groundwater pollution, Heavy metals, Soil contamination

1. Adelana, S. M. A., Adeosun, T. A., & Olorunfemi, M. O. (2019). Assessment of benzene and other volatile organic compounds in groundwater from petroleum-impacted sites in southern Nigeria. Environmental Monitoring and Assessment, 191(12), 745. https://doi.org/10.1007/s10661-019-7876-4 [Google Scholar] [Crossref]

2. Adegbola, A. A., Olowofela, J. A., & Oyekunle, J. A. O. (2021). Influence of soil pH on the mobility and bioavailability of heavy metals in petroleum-contaminated soils in southwestern Nigeria. Environmental Science and Pollution Research, 28(17), 21607-21618. https://doi.org/10.1007/ s11 356-021-13250-7 [Google Scholar] [Crossref]

3. Agbor Metropolis study. (2025). Assessing Agbor Metropolis's soil and groundwater: Environmental effects of storage tank leaks [PDF].Journal/Index. https://journals.indexcopernicus.com/api/fil e/view ByFileId/2420370 [Google Scholar] [Crossref]

4. Akpan, I. D., & Udosen, C. E. (2018). Hydrocarbon contamination and groundwater quality around petrol filling stations in Uyo, Akwa Ibom State, Nigeria. Journal of Environmental Chemistry and [Google Scholar] [Crossref]

5. Ecotoxicology, 10(5), 54-63. https://doi.org/10.5897/JECE2018.0439 [Google Scholar] [Crossref]

6. Akinbile, C. O., Ogunbileje, J. O., & Ilesanmi, A. O. (2022). Soil and groundwater contamination from leaking underground storage tanks: Evidence from Oyo State, Nigeria. Environmental Research Communications, 4(8), 085005. https://doi.org/10.1088/2515-7620/ac8c79 [Google Scholar] [Crossref]

7. Al-Bassam, A. M., & Naji, A. M. (2021). Hydrocarbon degradation and natural attenuation in arid environments: A case study of abandoned oil-contaminated sites in the Arabian Gulf region. Environmental [Google Scholar] [Crossref]

8. Earth Sciences, 80(1), 28. https://doi.org/10.1007/s12665-020-09320-1 [Google Scholar] [Crossref]

9. Amadi, A. N., Uzoigwe, N. R., & Eze, C. J. (2021). Soil and groundwater contamination by petroleum hydrocarbons around old petrol dumpsites in Port Harcourt, Nigeria. Journal of Environmental Protection, 12(7), 560-575. https://doi.org/10.4236/jep.2021.127034 [Google Scholar] [Crossref]

10. Chinedu, S. N., & Chukwu, E. M. (2017). Pollution load index as a tool for assessing heavy metal contamination in soil and sediment: A review. Nigerian Journal of Environmental Sciences and Technology, 1(2), 103-110. https://doi.org/10.36263/njest.2017.020103 [Google Scholar] [Crossref]

11. Department of Petroleum Resources (DPR). (2020). Environmental guidelines and standards for the petroleum industry in Nigeria (EGASPIN). Lagos: DPR Press. [Google Scholar] [Crossref]

12. Ekanem, I. A., Etim, U. J., & Udo, A. E. (2022). Assessment of heavy metals in soils around abandoned fuel stations in Akwa Ibom State, Nigeria. Nigerian Journal of Environmental Research, 20(1), 45-58. [Google Scholar] [Crossref]

13. Essien, B. A., & Udofia, U. E. (2020). Petroleum hydrocarbon contamination and ecological risk assessment of soils around decommissioned petrol stations in the Niger Delta, Nigeria. Environmental Pollution and Toxicology Journal, 34(4), 289-301. [Google Scholar] [Crossref]

14. Eze, C. L., & Nwaogazie, I. L. (2021). Acidic pH effects on heavy metal leaching from petroleum-contaminated soils: Implications for groundwater quality. Environmental Technology & Innovation ,22, 101473. https://doi.org/10.1016/j.eti.2021.101473 [Google Scholar] [Crossref]

15. Fei-Baffoe, B. (2024). Contamination of groundwater by petroleum hydrocarbons [Article]. ScienceDirect. https://www.sciencedirect.com/science/arti cle/pii/S2405844024019558 [Google Scholar] [Crossref]

16. Ibe, K. M., & Uzoigwe, N. R. (2020). Migration of heavy metals from oil contaminated soils to groundwater around aged fuel stations in Imo State, Nigeria. Environmental Systems Research, 9(1), 112. https://doi.org/10.1186/s40068-020-00170-2 [Google Scholar] [Crossref]

17. IOSR. (2017). Assessment of total petroleum hydrocarbon remediation [PDF]. IOSR Journals. https://iosrjournals.org/iosrjac/papers/vol16-issue1/Ser-2/E1601022833 [Google Scholar] [Crossref]

18. Nwankwoala, H. O., & Osibanjo, O. (2020). Hydrogeochemical evaluation of petroleum-contaminated aquifers in Niger Delta, Nigeria. Journal of African Earth Sciences,171,103974. https://doi.org/10.1016/j.jafrearsci.2020.103974 [Google Scholar] [Crossref]

19. Obida, C. B., Nwachukwu, M. A., & Osuji, L. C. (2021). Assessment of hydrocarbon pollution around fuel stations in Port Harcourt, Nigeria. Environmental Monitoring and Assessment, 193(3), 180. [https://doi.org/10.1007/s10661-02108929-4](https://doi.org/10.1007/s10661-021-08929-4) [Google Scholar] [Crossref]

20. Oboh, B. O., Odesanya, B. O., & Uyi, H. S. (2019). Ecological implications of high total petroleum hydrocarbon concentrations in oil-impacted soils of the Niger Delta, Nigeria. Environmental Monitoring and Assessment, 191(2), 123. https://doi.org/10.1007/s10661-019-7243-3 [Google Scholar] [Crossref]

21. Odukoya, A. M., & Abimbola, A. F. (2019). Heavy metal contamination and distribution in soil and groundwater around petroleum depots in southwestern Nigeria. Environmental Monitoring and Assessment, 191(3), 147.https://doi.org/10.1007/s10661-019-7246-0 [Google Scholar] [Crossref]

22. Olatunji, S. O., Adeola, A. A., & Ojo, A. F. (2020). Sources and distribution of heavy metals in oil-polluted soils of the Niger Delta, Nigeria. Environmental Forensics, 21(1), 65-78. https://doi.org/10.1080/15275922.2019.1708785 [Google Scholar] [Crossref]

23. Ololade, I. A., Adewuyi, G. O., & Ologundudu, A. (2019). Soil acidity and heavy metal mobilization in petroleum impacted sites in Ondo State, Nigeria. Journal of Environmental Chemical Engineering, 7(5), 103347. https://doi.org/10.1016/j.jece.2019.103347 [Google Scholar] [Crossref]

24. Okafor, C. F., Nwosu, J. U., & Eze, V. C. (2021). Subsurface migration of hydrocarbons in shallow aquifers of southern Nigeria: Evidence from soil-water correlation analysis. Environmental Earth Sciences, 80(6), 249. https://doi.org/10.1007/s12665-021-09493-4 [Google Scholar] [Crossref]

25. Okop, I. J. (2012). Determination of total petroleum hydrocarbon content in soil after petroleum impact [Conference paper]. WCE Proceedings. https://www.iaeng.org/publication/WCE2012/WCE2012pp1722-1726 [Google Scholar] [Crossref]

26. Owamah, H. I., Iserhienrhien, L., & Egboh, S. H. O. (2018). Assessment of total petroleum hydrocarbon contamination in soils around petroleum filling stations in Nigeria. Environmental Monitoring and Assessment, 190(6), 348. https://doi.org/10.1007/s10661-018-6692-8 [Google Scholar] [Crossref]

27. Udo, U. J., Akpan, P. E., & Ekanem, U. E. (2020). Geo-environmental assessment of hydrocarbon and heavy metal pollution in Uyo metropolis, Akwa Ibom State, Nigeria. Environmental Challenges, 1, 100003. https://doi.org/10.1016/j.envc.2020.100003 [Google Scholar] [Crossref]

28. UNEP. (2011). Environmental Assessment of Ogoniland. United Nations Environment Programme. [https://wedocs.unep.org/handle/20.500.11822/37001](https://wedocs.unep.org/handle/20.500.11822/37001 [Google Scholar] [Crossref]

29. World Health Organization (WHO). (2003). Benzene in drinking-water: Background document for development of WHO guidelines for drinking-water quality [PDF]. https://cdn.who.int/media/ docs /defaultsource/chemicalsafety/benzene/benzenesum.pdf [Google Scholar] [Crossref]

30. World Health Organization (WHO). (2017). Guidelines for drinking-water quality: Benzene fact sheet[PDF].https://www.who.int/docs/defaultsource/wash-documents/washchemicals/benzene-chemical-factsheet.pdf?sfvrsn=493e46964 [Google Scholar] [Crossref]

31. World Health Organization (WHO). (2021). Guidelines for drinking-water quality (4th ed., incorporating the 1st addendum). Geneva: WHO Press. https://www.who.int/ publications/ i/item/ 9789241549950 [Google Scholar] [Crossref]

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