Bioremediation techniques are routinely applied to recover soils polluted by polycyclic aromatic hydrocarbons (PAHs). These tech- niques are based on the well-established capability of soil microor- ganisms to degrade PAHs through growth-linked or co-metabolic reactions (Kanaly and Harayama, 2010). However, a major limiting factor in the bioremediation of PAH-polluted soils is the reduced bioaccessibility that is often exhibited by these pollutants, which results in difficulty in predicting whether an acceptable end-point decontamination level can be achieved. Bioaccessibility can be defined as the fraction of a pollutant that is potentially biodegradable