“…Furthermore, the extent of HOC sorption shows a strong dependence on the solution parameters, such as pH [24][25][26][27][28][29], ionic strength (I ) [23,[26][27][28], electrolyte cation valence [26,29,30], humic concentration [26,31], cosolute [32], and others. The cation, such as H + and Ca 2+ , can interact with carboxyl/hydroxyl functional groups on dissolved humic substances and mineral surfaces and reduce the negative electrostatic repulsion between the humic molecules and mineral interfaces.…”