Heavy Metals Accumulation in Water and Human Health Risk Assessment via the Consumption of Labeobarbus intermedius Samples from Borkena River, Ethiopia

Concentrations of heavy metals, namely, chromium, lead, cadmium, and copper, were evaluated in the water samples and selected fish organs (Labeobarbus intermedius) from the Borkena River, Ethiopia. The concentrations of these metals were determined using ELICO’s SL-176 double-beam atomic absorption spectrophotometer (AAS). The distribution of heavy metals in water samples analyzed was in the order of magnitude of Cu > Cr > Cd > Pb. The average heavy metal concentrations recorded in the water samples were below the maximum permissible limit established by international and national organizations (WHO, EPA, and USEPA), except for cadmium. Organ specificity was observed for accumulating the selected heavy metals in the order of liver > kidney > muscles. Pearson’s correlation results revealed that Cr and Cd originated from similar sources. Hazard quotient (HQ) and total hazard index (THI) results showed that Cu, Cr, Cd, and Pb contents were safe and might not have adverse public health effects. From the point of carcinogenic risk, this study suggests that the observed Cr and Cd concentrations possibly pose a risk of developing cancer in the future. Controlling waste at the source and implementing remediation strategies should be done to reduce heavy metal pollution in the river.

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