The cation exchange membrane used in the cell of this invention may contain {HEAD ~ any} of {TAIL ~ sulfonic, carboxylic and phosphoric acid groups} as an ion exchange group 
of
The cation exchange membrane used in the cell of this invention may contain { HEAD ~ any } of { TAIL ~ sulfonic , carboxylic and phosphoric acid groups } as an ion exchange group
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH