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Preferential solvation of the sorbate by Leonardite humic acid (LHA) molecules (grey), water (blue) and calcium ions (green) in dry and hydrated LHA. This analysis shows that the sorbate is preferentially surrounded by the LHA molecules in the dry and by water molecules in the hydrated LHA, regardless of the sorbate molecule. Symbols at the top of the upper panel indicate the type of sorbate
