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Table 1

The assessment of geoaccumulation index, potential ecological risk index for heavy metal

Evaluation indexFormulaParameter meaning
Geoaccumulation index  Ci: the measured concentration (mg/kg) 
Bi: geochemical background value (mg/kg) 
1.5, the background matrix correction factor due to lithogenic effects 
Potential ecological risk index  Ci: the measured concentration (mg/kg); 
Bi: geochemical background value (mg/kg) 
Ti: the toxic response factor for the heavy metal 
The toxic response factors for common Hg, As were 40, 10 respectively 
Evaluation indexFormulaParameter meaning
Geoaccumulation index  Ci: the measured concentration (mg/kg) 
Bi: geochemical background value (mg/kg) 
1.5, the background matrix correction factor due to lithogenic effects 
Potential ecological risk index  Ci: the measured concentration (mg/kg); 
Bi: geochemical background value (mg/kg) 
Ti: the toxic response factor for the heavy metal 
The toxic response factors for common Hg, As were 40, 10 respectively 
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