BioMed Research International / 2013 / Article / Tab 4

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]).

ValueSoil quality

EF < 2Deficiency to minimal enrichment
2 < EF < 5Moderate enrichment
5 < EF < 20Significant enrichment
20 <EF < 40Very high enrichment
40 < EFExtremely 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

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