ION EXCHANGE 



389 



KH,P04 



nr 



I 

 Resin 



Cation 

 exchanger 



I 

 Resin 



H3PO, 

 CpH^OH 



Fig. 9-1. 



MCI 



I 

 Resin 



V 



IT 



I 

 Resm 



V 



KCl 



'Cation 

 solution 



Fig. 9-2. 



Fig. 9-1. Cation or base exchange: sorption step in which potassium is adsorbed. 

 Fig. 9-2. Cation or base exchange: regeneration or eUition step in which previously 

 retained potassium is removed from column. 



KH2PO4 

 C2H5OH 



OH 



I 

 Resin 



VZZZZL 



yAnion 

 exchanger 



nr 



POf 



1 



Resin 



■^.'^j'/ /. 



KOH 

 C2H5OH 



Fig. \)-.\. 



NaOH 



nr 



Reiin 



OH 



I 

 Resin 



17 



Na,PO, 



Fig. 9-1. 



Anion 

 "solution 



Fig. 9.3. Anion exchange: sorption step in which phosphate is adsorl)ed. 

 Fig. 9-4. Anion exchange: regeneration or elution step in which previously retained 

 phosphate is removed from column. 



