[Method of Dividing the Value of Soil Heavy Metal Pollution Risk Screening: Using Cd as an Example]

The Soil Environmental Quality Risk Control Standard for Soil Contamination of Agricultural Land (GB 15618-2018) provides the risk screening value of soil environmental quality in China; however, because of differences in soil composition, and physical and chemical properties in different regions, this value has limitations for certain regions. Based on the limits of pollutants in crops given in the National Food Safety Standards Limits of Pollutants for Foods (GB 2762-2017), and using Cd in the soil of the main farming areas in southeastern Chongqing as an example, the content of the elemental biological effective state was determined for the suggested screening value. This method can provide a reference and method for improving the heavy metal and healthy element thresholds of soils with high or low bioavailability, and that are rich in Se content, among other factors.