112 



Figure V,2o Schematic arrangement for the partial separation of ions 

 by differential electrical migration from a wide zone of 

 the mixture placed in an electrically conducting back= 

 g round s o lut i on-^j ^^ o 



Start, a"^+ b" 



.A 



\^ 



~\r 



~v~ 



a 



^ a^+ b" b" 



