Geogenic distribution and baseline concentrations of Cr in surficial soil of Guiyang
贵阳表层土壤中铬的环境地球化学基线研究

Environmental geochemical characteristics of the heavy metal pollutant Cr in the surficial soil of Guiyang, the capital city of Guizhou Province are described. The baseline concentration of Cr in soil and geochemical norms were determined to distinguish natural from artificial influences on the environment. Using statistical analysis, we have established the baseline of Cr in Guiyang to be 44.0 mg·kg-1. Geoaccumulation index calculations indicated that non-contaminated surficial soil accounts for 46 %, 47% was between non-polluted and mid-level polluted, 6.8% was mid-level polluted, and only 0.2% was between mid-level polluted and severely polluted. The maximal Cr contamination degree (CD) was 2.01. CD analysis indicated that 69.2% of the surficial soil has not suffered Cr pollution. The total CD was below zero, so surficial soil in Guiyang does not suffer from Cr pollution.