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Effect of resin polymer composition on perfluoroalkyl acids (PFAAs) removal by (a,c) polyacrylic, and (b,d) polystyrene AERs at pH 4. Initial concentration of each PFAAs was C0 = 80 μg/L ( = 480 μg/L) Bicarbonate pKa = 6.3 was mostly in the neutral CO2 (aq)/H2CO3 form at pH 4.
