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Removal of (a) 3-phenylpropionic acid, (b) nitrate, and (c) sulfate by AER at different solution pH (4, 7, and 10) in single-solute system. Initial contaminant concentration C0 = 2.14 meq/L. Percent resin dose (Dose %) is the ratio of theoretical resin capacity to initial contaminant concentration on equivalent basis. Bars are the mean of triplicate samples with error bars showing one standard deviation.
