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Assessment of metal contamination and natural radiation hazards in different soil types near iron ore mines, Bahariya Oasis, Egypt

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Abstract

Nine metals (Al, Ba, Cr, Cu, Fe, Mn, Pb, V, and Zn) and three natural radionuclides (40K, 238U, and 232Th) were quantitatively determined in the cultivated and uncultivated soils of the Bahariya Oasis where the main mines of the Egyptian iron ore are located. The mean concentrations of Ba, Cr, Cu, Fe, V in the cultivated soils and Al, Cr, Cu, V in the uncultivated soils exceed maximum allowable concentration (MAC). The evaporites-rich uncultivated soils contain high concentrations of Zn. The contamination degrees (Cd) of the cultivated and evaporites-rich uncultivated soils were represented by moderate to extremely high values. All metals are spatially varied and their highest values are recorded in the northern parts of the oasis close to the iron mines. The highest values of the activity concentrations of 40K were recorded in the evaporites-rich uncultivated soils. On the other side, the highest values of 238U, 232Th were recorded in the cultivated soils. The cultivated soils samples show higher values of the total absorbed external gamma dose rate (D) and annual effective dose (AED) than the international recommended values (54 nGy/h and 0.07 mSv/y; respectively). The external hazard index (Hex) for all studied soils are mainly lower than unity. The origin of Bahariya soils is lithogenic and anthropogenic, whereas the role played by groundwater flow, evaporation of near-surface saline groundwater, and phosphatic fertilizers in the soil contamination is more effective than those of iron ore erosion.

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Acknowledgments

The authors acknowledge Prof. Mohamed M. Yehia (Central Laboratory for Environmental Quality Monitoring, National Water Research Center, El Qanater) for help during the chemical analyses of samples. Also, we are greatly indebted to Prof. Mohamed. M. Abu-Zeid (Ain Shams University) for revising the manuscript and providing valuable comments.

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Authors and Affiliations

  1. Geology Department, Faculty of Science, Ain Shams University, Cairo, 11566, Egypt

    Ashraf Baghdady, Samir Awad & Ahmed Gad

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  1. Ashraf Baghdady
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  2. Samir Awad
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  3. Ahmed Gad
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Correspondence to Ashraf Baghdady.

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Baghdady, A., Awad, S. & Gad, A. Assessment of metal contamination and natural radiation hazards in different soil types near iron ore mines, Bahariya Oasis, Egypt. Arab J Geosci 11, 506 (2018). https://doi.org/10.1007/s12517-018-3814-x

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