Abstract:
Current soil quality standards in China do not yet include benzoapyrene (BaP). In this research, soil standards of BaP were calculated using two environmental risk assessment models, the Risk-BasedCorrective Action (RBCA) model and the Contaminated Land Exposure Assessment (CLEA) model. Calculated results derived by these two models were compared. Theresults showed that, under the target risk level of 10
-5, the standard ofBaP for residential land use derived by the RBCA and CLEA models was 0.83 and 1.21 mg/kg respectively, and the standard for industrial land use was 4.10 and 26.30 mg/kg respectively. For residential land use, thecalculatedstandards by the two models were close to each other and also close to the standards of other countries. However, for industrial land use, significant difference existed between the calculated standards from the two models. The results of the RBCA model were close to the standard levels of other countries, while the results of CLEA were significantly higher. The difference in the results from these two models was in two main aspects: one was the difference of exposure assessment led by different principles and algorithms of the two models, and the otherwas the difference in source and data level adopted in BaP toxicology data.Both results of the two models showed that oral ingestion and dermal exposure pathways were the main ways by which the human body was exposed to BaP in soil, and the exposure caused by the inhalation pathway was small.