ORIGINAL RESEARCH
A Study of Microbiological Contamination and Metal Toxicity from Artisanal Crude Oil Refining on Ecosystem Health
 
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1
Department of Medical Laboratory Sciences, Faculty of Applied Medical Sciences, King Abdulaziz University, Jeddah 21589, Saudi Arabia
 
2
King Fahd Medical Research Center, King Abdulaziz University, Jeddah 21589, Saudi Arabia
 
3
Department of Agricultural Engineering, Delta State University of Science and Technology, Ozoro, 1334111, Nigeria
 
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Department of Civil and Water Resources Engineering, Delta State University of Science and Technology, Ozoro, 1334111, Nigeria
 
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Department of Urban and Regional Planning, Delta State University of Science and Technology, Ozoro, 1334111, Nigeria
 
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Department of Electrical Engineering, Delta State University of Science and Technology, Ozoro, Nigeria
 
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Department of Food Science and Nutrition, College of Sciences, Taif University, Taif 21944, Saudi Arabia
 
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Department of Biological Sciences, College of Science, University of Jeddah, Jeddah 21959, Saudi Arabia
 
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Department of Chemistry, Preparatory Year Program, Batterjee Medical College, P.O. Box 6231, Jeddah, Saudi Arabia
 
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Department of Biology, College of Science, Taif University, Taif 21944, Saudi Arabia
 
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Department of Medicine, College of Medicine, Umm Al-Qura University, Mecca, SAU
 
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Chemistry Department, College of Science, Taibah University, Al-Madinah Al Munawarah, P.O. Box 30002, Saudi Arabia
 
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Department of Biology, Al-Jumum University College, Umm Al-Qura University, Makkah, Saudi Arabia
 
 
Submission date: 2024-08-19
 
 
Final revision date: 2024-10-03
 
 
Acceptance date: 2024-11-10
 
 
Online publication date: 2025-01-29
 
 
Publication date: 2026-01-29
 
 
Corresponding author
Rokayya Sami   

Department of Food Science and Nutrition, College of Sciences, Taif University, Taif 21944, Saudi Arabia
 
 
Pol. J. Environ. Stud. 2026;35(1):43-58
 
KEYWORDS
TOPICS
ABSTRACT
This research aimed to examine the environmental consequences of crude petroleum refining processes. Water and air samples, taken from locations both near and far from artisanal oil refinery areas, were analyzed following approved procedures. The results obtained revealed that the operation of artisanal oil refineries had substantial environmental impacts. It was noted that water samples from highincidence areas exhibited the highest levels of TPH (mean ~561 μg/L), potentially toxic metals, HUB (mean ~31.33 cfu/mL), and HUF (mean ~16.87 cfu/mL). However, water samples in the high-incidence area had the lowest electrical conductivity and dielectric constant values. Similarly, the highest levels of VOCs, SO₂, CH₄, NO₂, CO, and NH₃, along with the lowest O₃ values, were recorded in high-emission zones. In rainwater and surface water, potentially toxic metal concentrations followed this pattern: Zn>Cu>Ni>Pb>Cd>As and Zn>Cu>Ni>Pb>Cd>As>Hg, respectively. The TCR values indicated that the metal concentrations were within the tolerable carcinogenic risk range, while the non-carcinogenic risks were within acceptable levels (HI<1). The findings of this study emphasized the importance of fostering a cleaner environment and identifying the basic pollution caused by human activities.
CONFLICT OF INTEREST
The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
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