Abstract: The health risk assessment of soil PAHs in soils of the Tiexi relocated old industrial area (TROIA), Shenyang was evaluated by the RBCA model of USEPA. ∑PAHs in soil samples from TROIA were 290.9-8492.37 μg·kg^-1 dry weight. The noncancer hazard index was from 6.39×10^-6 to 3.04×10^-4, which was less than the threshold defined by USEPA and indicated that soil PAHs in the TROIA had little risk on human health. The cancer risk index was from 2.08×10^-7 to 7.52×10^-6, which was evidently less than upper threshold of cancer risk (10^-4), but was a little more than low threshold of acceptable cancer risk (10^-6). These indicated that the cancer risk of soil PAHs was acceptable in the TROIA, but great attention to the benzo(a)pyrene pollution in the soil should be paid because their contribution rates to the total cancer risk was 61.0%. The personal exposure of soil PAHs was mainly by direct ingestion and dermal contact pathways, which contributed to the noncancer hazard index and cancer risk by 99% and 100%, respectively.

Key words: snow cover, litter decomposition, alpine forest, water soluble component, organic solvent soluble component.