In contrast, the probability of HCB being surrounded by HS molecules varies significantly depending on the SOM type. The highest probability is observed for the SOM II (low acidity) and SOM III (high aromaticity) systems. A notable contribution is also evident in the highly aliphatic SOM (SOM V), while the lowest probability is found in SOM I, which exhibits high acidity. Overall, HCB has a higher concentration in the HS phase compared to SAA, suggesting that HCB has a stronger binding affinity to SOM. This distinct behavior of SAA and HCB in the SOM II system is illustrated in Figure . Unlike SAA, HCB diffusion is strongly influenced by direct HCB-SOM interactions.