Abstract: Soil organic matter (SOM) and aggregate play a significant role in affecting adsorption and transport of organic pollutants in soil. In this study, the effects of SOM and aggregate on the adsorption and transport of bisphenol A (BPA) was investigated by isothermal adsorption experiments and soil column experiments using soils collected from the fields of Chaoyangpo, Gongzhuling, and Yushu, Jilin Province, aiming to provide scientific basis 〖JP〗for risk assessment of organic pollutants such as BPA to soil and groundwater. The results showed that: (1) The adsorption amount of BPA increased with increasing SOM content. The transport ability was significantly negatively correlated with SOM content (P<0.05). In the Yushu soil with relatively higher SOM content, the penetration rate of BPA was 22.5% and the maximum breakthrough rate (C/C₀) was 0.3. In the soil with SOM being excluded, the penetration rate of BPA was 82.5% and the maximum breakthrough rate (C/C₀) was 0.94. (2) The variation of SOM contents in the bulk soil, macro-aggregate and micro-aggregate of the same soil was limited. The adsorption capacity of BPA followed the order of soil microaggregate > soil macro-aggregate > bulk soil. The transport ability of BPA in soil microaggregates was significantly weaker than that in bulk soil and soil macro-aggregates, indicating that the microporous structure would increase soil BPA retention. (3) The low surface tension solution could elute part of BPA from the soil after the background solution elution, indicating that the hydrophobic effect was one of the mechanisms controlling soil BPA adsorption.

Key words: bisphenol A, soil organic matter, soil aggregate, surface tension, transport.