The probable significance of a strong involvement of the tail in the sorption process is underlined also by the strong sorption of FOSA at low pH, as the head group of FOSA (i.e., SO 2 NH 2 ) is not charged under low-pH conditions (p K a = 6.24, 54 6.52 55 ).
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The Adsorption of Per- and Polyfluoroalkyl Substances (PFASs) onto Ferrihydrite Is Governed by Surface Charge.
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