= 111+ - 



TABLE V,I„ Principal Parts of Apparatus for Analysis 

 by Differential Electrical Migration 



Electrodes 



Carbon (graphite) (cathode and anode) 

 Platiniaa (wire) (cathode and anode) 

 Stainless steel (cathode) 

 Nichrome (wire) (cathode) 



Electrode Vessels 



Glass 



Plastic (Lucite or polyethylene) 



Polystyrene foam 



Migration Region 



Paper plus background solution 



Strips 



Pads 



Sheets 



Cotton plus backgroiind solution 

 String plus background solution 

 Packed tubes or troughs 



Celite 



Cellulose 



Ion Exchange resins 



Powdered glass 



Starch 



Density gradients 



pH gradients plus density gradients 



Background Solutions (cao Ool M) 



Acids 

 Bases 

 Salts 



Chelating agents 



Complex- forming substances 



pH buffers 



Supports 



Glass points in cooled atmosphere 



