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Table 2 Geoaccumulation index (Igeo) classification [EU 1998]

From: Monitoring of the changes in potential environmental risk of some heavy metals in water and sediments of Burullus Lake, Egypt

Igeo Igeo class Designation of sediment quality
> 5 6 Extremely contaminated
4–5 5 Strongly to extremely contaminated
3–4 4 Strongly contaminated
2–3 3 Moderately to strongly contaminated
1–2 2 Moderately contaminated
0–1 1 Uncontaminated to moderately contaminated
< 0 0 Uncontaminated