Research Article
Risk Assessment of Heavy Metals Pollution in Agricultural Soils of Siling Reservoir Watershed in Zhejiang Province, China
Table 4
Description of enrichment factor (
), contamination factor (
), geoaccumulation index (
), and degree of contamination (
) (Hakanson 1980 [
36]; Sutherland 2000 [
62]).
| Value | Soil quality |
| EF < 2 | Deficiency to minimal enrichment | 2 < EF < 5 | Moderate enrichment | 5 < EF < 20 | Significant enrichment | 20 <EF < 40 | Very high enrichment | 40 < EF | Extremely high enrichment |
| | Low contamination factor indicating low contamination | | Moderate contamination factor | | Considerable contamination factor | | Very high contamination factor |
| | Practically uncontaminated | | Uncontaminated to moderately contaminated | | Moderately contaminated | | Moderately to heavily contaminated | | Heavily contaminated | | Heavily to extremely contaminated | | Extremely contaminated |
| | Low degree of contamination | | Moderate degree of contamination | | Considerable degree of contamination | | Very high degree of contamination |
|
|