Table 1 Footnote
Adapted from Abdullah et al. (2020) and Onjefu et al. (2020).
Soil contamination criteria based on GI and EF.Enrichment factor | Geoaccumulation index | ||
|---|---|---|---|
Classification | Degree of soil enrichment | Classification | Degree of soil contamination |
0 < 2 | Deficient | GI < 0 | Unpolluted |
2 < EF < 5 | Moderate | 1 ≤ GI < 2 | Moderately polluted |
5 < EF < 20 | Significant | 3 ≤ GI < 4 | Strongly polluted |
20 < EF < 40 | Very significant | 4 ≤ GI < 5 | Strong to very strong polluted |
EF > 40 | Extremely significant | GI ≥ 5 | Very strongly polluted |