| Guard column  | 
    Analitical column  | 
    Comments | |
|---|---|---|---|
| Transition Metal Ions  | 
     
       IC T-G 
     | 
     
       IC T-521 
     | 
    All piping including injector should be non-metal.  | 
  
| Rare Earth Ions  | 
     
       IC R-G 
     | 
     
       IC R-621 
     | 
    Stainless steel piping can be used. Gradient system is necessary. Acid concentration of sample should be lower than 1N.  |