Spatial distribution of urban soil physicochemical property in Shanghai and its impact on soil contaminants risk control values
To investigate the impact of soil physicochemical property on the calculation of risk control values for contaminants in soil,this paper selected Shanghai as the research area and collected 296 soil samples for soil physicochemical parameter analysis.The soil risk control values for different contaminants were calculated according to the method in the"Technical guidelines for risk assessment of soil contamination of land for construction"(HJ 25.3-2019),and they were compared with the risk screening values in"Soil environment quality risk control standard for soil contamination of development land"(GB 36600-2018).The results showed that the soil in the study area had typical cohesive soil characteristics,and there were significant differences in physicochemical parameters compared to recommended values in HJ 25.3-2019.The values of soil physicochemical parameters mainly affect the risk calculation results of volatile organic compounds.Using the measured background values of physicochemical parameters in the research area to calculate the soil risk control values of 25 volatile organic compounds in the first and second types of land,the results showed varying degrees of differences compared with the risk screening values in GB 36600-2018.Using the Crystal Ball model to calculate the sensitivity of soil bulk density(ρb),volume ratio of pore water in aerated soil layers(θws),volume ratio of pore air in the soil layer(θas)and soil organic carbon mass fraction(foc)to soil risk control values.The sensitivity ranking of the 4 parameters wasρb＞foc＞θws＞θas.The physical properties of contaminants could affect the sensitivity of soil physicochemical parameters to soil risk control values calculation.The large difference between θas,θws of soil in the study area and the recommended values of HJ 25.3-2019 causing the difference between the calculated soil risk control values and the risk screening value of GB 36600-2018.
urban soilsoil physicochemical parametersvolatile organic compoundssoil risk control values
万方数据
维普
