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Permeation of different inorganic anions, namely, F−, Cl−, Br−, NO2−, NO3− and SO42− through NafionTM 117 ionomer membrane has been studied as a function of pH and salt concentrations in feed solution. At low pH, fluoride and nitrite ions showed higher permeation than other anions. This has been attributed to a higher association of HF and HNO2 in the membrane phase. Easy diffusion of the undissociated...