Acid rain (AR) has become an important environmental problem in southern China. In addition, the pollution of polycyclic aromatic hydrocarbons (PAHs) in soils is increasingly drawing people's attention. In this work, we conducted a series of the simulated acid rain (SAR) soaking tests to study the distribution of organo-mineral aggregates and the release of PAHs in those aggregates. The results showed that the contents of silt and clay in organo-mineral aggregates increased after being soaked by SAR; while the contents of coarse sand and fine sand decreased, the extent of impact increased with increase of SAR pH. The AR facilitated the release of PAHs in organo-mineral aggregates differentially; based on the size of the compounds, the PAHs with less aromatic rings (≤4) in clay and silt released significantly, but the impact of SAR on the release of PAHs with more aromatic rings (≥5) was slight. The amount of PAHs released from organo-mineral aggregates increased with the increase of SAR pH. The contents of clay and hematite in the soil decreased significantly after being soaked by SAR, which results in the decomposition of organo-mineral aggregates, the desorption of organic matter with lower molecular mass from organo-mineral aggregates, and the release of PAHs bond to the aggregates.
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