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Evaluation of the Effects of Heavy Metals on Water from Illegal Crude Oil Refineries: a Case Study of Three Selected Communities in the Niger Delta Region, Nigeria
Summary
This paper is not about microplastics; it measures heavy metal contamination (and associated health risk indices) in surface water near illegal crude oil refineries in three communities of Nigeria's Niger Delta region.
In order to assess the levels of heavy metals and health concerns associated with the operations of illicit refineries in water, 15 surface water samples were taken from Okerenkoko, Peterou-Gbene, and Bille in the Niger Delta region of Nigeria. A number of heavy metal indices, including the Contamination Factor (Cf), Pollution Load Index (PLI), Modified Degree of Contamination (mCd), Ecological Risk Factor (Erf), and Geo Accumulation Index (Igeo), were successfully applied in the evaluation of heavy metal contamination in surface water using World Health Organization WHO (2011) and Nigerian Standard for Water Quality NSDWQ (2007) standards. Additional research from WHO and NSDWQ comparisons revealed that the majority of the investigated heavy metals were higher than permissble limits in comparison to the control site. Although the concentration of heavy metals in the aquatic habitats varies amongst the various communities in the area, according to the CV. Additionally, CV contends that there is a connection between the illicit refiners’ actions at the study site and the water chemistry changes that result in surface water contamination. According to data from the WHO and the NSDWQ, the majority of heavy metal concentration readings in the study sites exceeded the acceptable limits when compared to those in the control site. According to the results of heavy metals indices such as Cf and PLI, the surface water in the analyzed site ranges from very slightly contaminated to extremely contaminated. However, Erf and Igeo findings showed that human activities through illegal refiners increase heavy metal concentration, which results in a very high potential ecological risk associated with surface water. Additional mCd results demonstrated that in the studied sites, the surface water has a high degree of contamination. The findings suggest that surface water assessment is required to warn against a decline in water quality in the area.
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