The removal of nitrate ions through SB-6407 and Neosepta AMX anion exchange membranes has been studied under Donnan dialysis conditions as I a function of receiver phase concentration and co-existence anions in the feed phase. For both membranes, it was observed that the transport of nitrate increased with increase of the receiver phase concentration and decreased ill the presence of co-existence anions in feed phase. It was also observed that the nitrate transport efficiency of the SB-6407 was higher than that of the Neosepta AMX membrane. The transport of nitrate ions was correlated with the flux data and explained according to the membrane structure.