Environmental risk assessment of some potentially toxic elements in El-Tabbin region (Cairo, Egypt) |
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| Authors: | Ahmed A Melegy Veronika Cve?ková Katarína Kr?mová Stanislav Rapant |
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| Institution: | 1. Department of Geological Sciences, National Research Centre (NRC), Dokki, Cairo, Egypt
2. Geological Survey of the Slovak Republic, Mlynská Dolina 1, 817 04, Bratislava, Slovak Republic
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| Abstract: | As much as 24 soil samples and 6 stream sediments from the River Nile were studied in El-Tabbin region (Great Cairo, Egypt). Twelve chemicals, potentially toxic elements posing potential environmental risk, were the object of concern in this study. Mean contents of analysed elements (in mg kg?1) in soils and the River Nile stream sediments were the following: Ass 3.6/Asss 1.5, Cds 0.33/Cdss 0.12, Crs 87.7/Crss 141.5, Cus 40.3/Cuss 43.8, Hgs 0.03/Hgss 0.13, Pbs 33.3/Pbss 20.2, Zns 150/Znss 109, Ses 0.24/Sess 0.05, Nis 37.2/Niss 48, Sbs 1.25/Sbss 1, Bas 892/Bass 431, Vs 103.3/Vss 167.8. Furthermore, geochemical background values were derived for soil and stream sediment samples. The values are as follows (in mg kg?1): Ass 1.33/Asss 1, Cds 0.48/Cdss 0.05, Crs 54.7/Crss 106.5, Cus 23.8/Cuss 23, Hgs 0.025/Hgss 0.095, Pbs 15.3/Pbss 13.5, Zns 70/Znss 55, Ses 0.13/Sess 0.05, Nis 19.5/Niss 32.5, Sbs 1/Sbss 1, Bas 266/Bass 275, Vs 50.7/Vss 119. More than two-thirds of soil and sediment samples exceeded established (based on literature data) risk limit values for non-polluted environment. Based on environmental risk assessment for potentially toxic elements in soils and sediments in more than 45% of total area disturbed environment (I ER = 1–3) was documented and more than 13% of territory was characterised with highly disturbed environment (I ER > 3). |
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