Geogenic Distribution and Baseline Concentrations of Cadmium in Surficial Soil of Guiyang, China
贵阳市表层土壤中镉的环境地球化学基线研究

The characteristics of environmental geochemistry of heavy metal pollutant cadmium (Cd) in the surficial soil of Guiyang, Guizhou, China was studied. The baseline concentration of Cd in soil and the geochemistry norms have been established to distinguish the nature or artificial influence on the environment. The statistical analysis indicated that the baseline of Cd in Guiyang was 0.068 mg/kg. Geoaccumulation index analysis indicated that the unpolluted surface soils accounts for 40%, and 19% between nonpollution to mid-pollution, 14% for mid-pollution, 19% between mid-pollution to severe pollution, 7% for severe pollution, only 1% between severe pollution to super severe pollution. The maximum of Cd contamination degree (CD) is 12.1. CD analysis indicated that the unpolluted surface soils accounts for 57.9%.