Background, aim, and scope Behavior of hydrophobic organic contaminants (HOCs) in the environment has attracted research interest for more than three decades. It has been clearly concluded that humic substances (HSs), which are the main content of soil/sediment organic matter (SOM) and dissolved organic matter (DOM), controls the sorption of HOCs in soils/sediments. In order to predict the movement of HOCs in the environment, many studies have been conducted to relate HOCs sorption characteristics with HS chemical properties. However, no consensus has been reached on precisely what HS chemical properties regulate HOC sorption, indicating that other HS properties (besides chemical properties) may also control HOC–HS interactions. Main features Increasing amounts of research reveal that SOM physical properties can affect the accessibility of  HOCs to SOM sorption sites and thus are of great importance for altering HOC–SOM interactions. Therefore, different from the past reviews on HOCs sorption in soils / sediments, this current one emphasizes physical conformation of HSs for both solid and dissolved forms.



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