HJ 25.32019 (HJ25.32019) & related versions
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Technical guidelines for risk assessment of soil contamination of land for construction

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Technical Guidelines for Risk Assessment of Contaminated Sites

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HJ 25.32019: PDF in English 6.4.2 Route of skin contact with soil
In the second type of land use, people can be exposed to contaminated soil due to direct skin contact. For carcinogenic and
Noncarcinogenic effect, the recommended model for calculating the soil exposure corresponding to this pathway is shown in Appendix A formula (A.23) and formula
(A.24).
6.4.3 Inhalation of soil particulate matter
Under the second type of land use, people can be exposed to contaminated soil by inhaling airborne particulate matter from the soil. for
The carcinogenic and noncarcinogenic effects of pollutants. The recommended model for calculating the soil exposure corresponding to this pathway is shown in Appendix A (A.25).
And formula (A.26).
6.4.4 Inhalation of gaseous pollutants from surface soil in outdoor air
Under the second type of land use, people can be exposed to pollution due to inhalation of gaseous pollutants from surface soil in outdoor air.
Stain the soil. For the carcinogenic and noncarcinogenic effects of pollutants, the recommended model for calculating the soil exposure for this pathway is shown in the appendix
A formula (A.27) and formula (A.28).
6.4.5 Intake of gaseous pollutants from the lower soil in the outdoor air
Under the second type of land use, people can be exposed to pollutants by inhaling gaseous pollutants from the lower soil in the outdoor air.
Stain the soil. For the carcinogenic and noncarcinogenic effects of pollutants, the recommended model for calculating the soil exposure for this pathway is shown in the appendix
A formula (A.29) and formula (A.30).
6.4.6 Intake of gaseous pollutants from groundwater in outdoor air
Under the second type of land use, people can be exposed to pollution by inhaling gaseous pollutants from groundwater in outdoor air.
groundwater. For the carcinogenic and noncarcinogenic effects of pollutants, the recommended model for calculating the corresponding groundwater exposure for this pathway is attached
Record A formula (A.31) and formula (A.32).
6.4.7 Inhalation of gaseous pollutants from lower soil in indoor air
Under the second type of land use, people can be exposed to pollutants by inhaling gaseous pollutants from the lower soil in the indoor air.
Stain the soil. For the carcinogenic and noncarcinogenic effects of pollutants, the recommended model for calculating the soil exposure for this pathway is shown in the appendix
A formula (A.33) and formula (A.34).
6.4.8 Intake of gaseous pollutants from groundwater in indoor air
Under the second type of land use, people can be exposed to pollution by inhaling gaseous pollutants from groundwater in indoor air
groundwater. For the carcinogenic and noncarcinogenic effects of pollutants, the recommended model for calculating the corresponding groundwater exposure for this pathway is attached
Record the formula (A.35) and formula (A.36).
6.4.9 Drinking groundwater route
Under the second type of land use, people can be exposed to groundwater pollutants due to drinking groundwater. For single pollutants
Carcinogenic and noncarcinogenic effects, the recommended model for calculating the corresponding groundwater exposure of this pathway is shown in Appendix A formula (A.37) and
(A.38).
7 Technical requirements for toxicity assessment
7.1 Analysis of toxic effects of pollutants
Analyze the harmful effects of pollutants on human health through different pathways, including carcinogenic effects, noncarcinogenic effects, pollutants
The harm mechanism to human health and the doseresponse relationship.
7.2 Determination of pollutantrelated parameters
7.2.1 Carcinogenicity toxicity parameters
Carcinogenicity toxicity parameters include respiratory inhalation unit carcinogenic factor (IUR), respiratory inhalation carcinogenic slope factor
(SFi), oral carcinogenic slope factor (SFo), and skin contact carcinogenic slope factor (SFd). Partial pollutant
The recommended values of toxicity parameters for carcinogenic effects are shown in Table B.1 of Appendix B.
Breathing inhalation carcinogenic slope factor (SFi) according to the respiratory inhalation unit carcinogenic factor (IUR) in Table B.1 of Appendix B
Derived; Carcinogenic slope coefficient (SFd) of skin contact according to Table B.1 of Appendix B
Extrapolated to obtain. The recommended models for extrapolating SFi and SFd are shown in Appendix B formula (B.1) and formula (B.3), respectively.
7.2.2 Noncarcinogenic effect toxicity parameters
Noncarcinogenic effect toxicity parameters include respiratory inhalation reference concentration (RfC), respiratory inhalation reference dose (RfDi),
Oral intake reference dose (RfDo) and skin contact reference dose (RfDd). Noncarcinogenic effects of some pollutants
Refer to Table B.1 for Appendix B for recommended values.
The respiratory inhalation reference dose (RfDi) is extrapolated from the respiratory inhalation reference concentration (RfC) in Table B.1. skin
The reference exposure dose (RfDd) was extrapolated from the oral intake reference dose (RfDo) in Table B.1. For extrapolation
The recommended models for RfDi and RfDd are shown in Appendix B formula (B.2) and formula (B.4), respectively.
7.2.3 Physicochemical parameters of pollutants
The physical and chemical properties of pollution required for risk assessment include dimensionless Henry constant (H) ยด, diffusion coefficient in air
(Da), water diffusion coefficient (Dw), soilorganic carbon partition coefficient (Koc), and water solubility (S). Partially soiled
The recommended values of the physical and chemical properties of the dyes are shown in Table B.2.
7.2.4 Other related parameters of pollutants
Other relevant parameters include digestive tract absorption factor (ABSgi), skin absorption factor (ABSd), and oral intake
Yield factor (ABSo). Recommendations for digestive tract absorption factor (ABSgi) and skin absorption factor (ABSd) of some pollutants
For parameter values, see Table B.1 in Appendix B. For recommended parameter values for oral absorption absorption factor (ABSo), see Table G.1 in Appendix G.
8 Technical requirements for risk characterization
8.2.3 Carcinogenic risk of single pollutant in groundwater
For a single pollutant, calculate the gaseous pollutants drawn from the groundwater drawn into the outdoor air, drawn into the indoor air
Recommended models for carcinogenic risk from groundwater gaseous pollutants and drinking groundwater exposure pathways are shown in Appendix C.
(C.15), (C.16), (C.17). Calculate the risk of carcinogenicity of a single pollutant in groundwater through the above three exposure routes
The recommended model is shown in Appendix C (C.18).
8.2.4 Hazard quotient of single pollutant in groundwater
For a single pollutant, calculate the gaseous pollutants drawn from the groundwater drawn into the outdoor air, drawn into the indoor air
Gaseous pollutants from groundwater and recommended models of hazards from exposure to drinking groundwater are listed in Appendix C.
(C.19), (C.20), and (C.21). Calculate the hazard index of a single pollutant in groundwater through the above three exposure routes
The recommended model is shown in Appendix C (C.22).
8.3 Uncertainty analysis
8.3.1 The main sources of uncertainty in the risk assessment results of the plot should be analyzed, including exposure scenario assumptions and assessment models
Applicability, model parameter values, etc.
8.3.2 Analysis of Contribution Rate of Exposure Risk
Recommended models for analysis of carcinogenic risk and hazard contribution rate of a single pollutant through different exposure routes, see Appendix D, respectively
Formula (D.1) and formula (D.2). The greater the percentage calculated from the above formula, the more specific the route of exposure
The higher the contribution rate to total risk.
8.3.3 Model parameter sensitivity analysis
8.3.3.1 Principles for determining sensitive parameters
The parameter (P) selected for sensitivity analysis should generally be a parameter that has a greater impact on the risk calculation results, such as human
Grouprelated parameters (weight, exposure period, frequency of exposure, etc.), parameters related to the route of exposure (daily soil intake,
Soil surface soil adhesion coefficient, daily inhaled air volume, indoor space volume and steam infiltration area ratio, etc.).
When the risk contribution rate of a single exposure pathway exceeds 20%, a sensitivity analysis of the population and parameters related to that pathway should be performed.
8.3.3.2 Sensitivity analysis method
The sensitivity of model parameters can be expressed by the sensitivity ratio, that is, the change of model parameter values (from P1 to P2) and
The ratio of changes in carcinogenic risk or harm quotient (from X1 to X2). The recommended model for calculating the sensitivity ratio is attached
Record the D formula (D.3).
The greater the sensitivity ratio, the greater the impact of this parameter on risk. Perform model parameter sensitivity analysis
Taking into account the actual value range of the parameter, the change range of the parameter value is determined.
9 Technical requirements for calculating risk control values
9.1 Acceptable Carcinogenic Risk and Harm Quotient
When calculating the risk control value of soil and groundwater based on carcinogenic effects, this standard adopts a single pollutant
The cancer risk is 106; the single pollutant used in calculating soil and groundwater risk control values based on noncarcinogenic effects ...
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Standard ID  HJ 25.32019 (HJ25.32019)  Description (Translated English)  Technical guidelines for risk assessment of soil contamination of land for construction  Sector / Industry  Environmental Protection Industry Standard  Word Count Estimation  54,584  Date of Issue  20191205  Date of Implementation  20191205 
