- 118 



Figure 7,50 One=way eleotrochromatographic separation of rare earth 

 ions, -with radioactive tracers, in paper moistened with 

 lactic acid solutions (5 volts per cmo for 2i4. hours) and 

 with tartaric acid plus aamonium tartrate (5 volts per 

 cmo for I4B hours). Zones were located by photographyo 

 Separations in dilute lactic acid were the result of 

 selective sorption by the papero Separations in the 

 presence of tartrate were the result of complex forma- 

 tionl9„ 



Stort 



Anode 



Lactic 

 O.IM 



0.2 5 M 



0.5 M 



0.035M 

 ium 

 Tartrate 0.0I5M 



H 

 Cathode "" 



