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Assessment of the potential ecological and human health risks of heavy metals in Ahvaz oil field, Iran

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  • Mahmood Reza Ghorbani
  • Navid Ghanavati
  • Timoor Babaenejad
  • Ahad Nazarpour
  • Khoshnaz Payandeh

Abstract

The potential hazard to human health from exposure to heavy metals in surface soil was assessed using 66 soil samples collected from Ahvaz oil field. To this end, the contents of heavy metals were measured by the inductively coupled plasma spectroscopy (ICP-OES). Mean levels of As, Cd, Co, Cr, Cu, Ni, Pb, V, and Zn were 5.9, 0.4, 7.1, 36.5, 41.2, 39.8, 67.4, 31.5, and 77.6 mg/kg, respectively. Contents of all studied heavy metals, with the exception of Co, Cr, and V, were several times higher than that of baselines. Correlation coefficients and principal component analysis (PCA) identified two main groups as sources of heavy metals in the surface soil of Ahvaz oil-field. Metals such as Co, Cr, and V were observed to originate from natural sources and As, Cd, Cu, Ni, Pb, and Zn originated from anthropogenic sources such as petroleum leakage and the pollution caused by drilling mud from oil wells. Pb and Zn were of significantly high EF mean enrichment value, and Co, Cu, Cd, and As had high enrichment in surface soil. Pb, Cr, V, Zn, Co, Cu, Ni, and As had a low potential ecological risk (PER) whereas Cd had a moderate PER. The risk of carcinogenic and non-carcinogenic diseases was detected to be higher in children than in adults. The carcinogenic risk (Cr) calculation was more than 1 × 10-6 for children and adults. Additionally, the CR of Cr for both children and adults indicated risk under control conditions.

Suggested Citation

  • Mahmood Reza Ghorbani & Navid Ghanavati & Timoor Babaenejad & Ahad Nazarpour & Khoshnaz Payandeh, 2020. "Assessment of the potential ecological and human health risks of heavy metals in Ahvaz oil field, Iran," PLOS ONE, Public Library of Science, vol. 15(11), pages 1-16, November.
    • Handle: RePEc:plo:pone00:0242703
    DOI: 10.1371/journal.pone.0242703
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