| Chromatographic    parameter | 
        
        RSD % | 
        Tailing    factor | 
        plate count | 
        
        sample | 
       
      
        
        | Result 
          (ppm) | 
       
      
        | 
          1) Wavelength (nm)         | 
        
          | 
          | 
          | 
        
          | 
       
      
        | 250 | 
        
        0.27 | 
        1.2 | 
        5869 | 
        
        1.70 | 
       
      
        | 252 | 
        
        0.28 | 
        1.2 | 
        5874 | 
        
        1.30 | 
       
      
        | 254 | 
        
        0.42 | 
        1.2 | 
        5866 | 
        
        1.30 | 
       
      
        | 256 | 
        
        0.45 | 
        1.2 | 
        5870 | 
        
        1.30 | 
       
      
        | 258 | 
        
        0.42 | 
        1.2 | 
        5873 | 
        
        1.30 | 
       
      
        | 
          2) Flow rate (ml min-1)         | 
        
          | 
          | 
          | 
        
          | 
       
      
        | 0.8 | 
        
        0.09 | 
        1.2 | 
        28089 | 
        
        1.45 | 
       
      
        | 0.9 | 
        
        0.05 | 
        1.2 | 
        6695 | 
        
        1.50 | 
       
      
        | 1 | 
        
        0.42 | 
        1.2 | 
        5866 | 
        
        1.30 | 
       
      
        | 1.1 | 
        
        0.07 | 
        1.1 | 
        6016 | 
        
        1.40 | 
       
      
        | 
          3) Column    temperature (°C)         | 
        
          | 
          | 
          | 
        
          | 
       
      
        | 20 | 
        
        0.27 | 
        1.1 | 
        6254 | 
        
        2 | 
       
      
        | 23 | 
        
        0.18 | 
        1.1 | 
        6435 | 
        
        1.4 | 
       
      
        | 25 | 
        
        0.42 | 
        1.2 | 
        5866 | 
        
        1.32 | 
       
      
        | 27 | 
        
        1.98 | 
        1.1 | 
        6632 | 
        
        1.62 | 
       
      
        | 4) % of Acetonitrile content in    the mobile phase  | 
          | 
          | 
          | 
        
          | 
       
      
        | 12.0% | 
        
        0.69 | 
        1.0 | 
        6092 | 
        
        2 | 
       
      
        | 15.0% | 
        
        0.42 | 
        1.2 | 
        5866 | 
        
        1.3 | 
       
      
        | 18.0% | 
        
        1.16 | 
        1.4 | 
        10988 | 
        
        2.3 | 
       
      
        | 20.0% | 
        
        1.75 | 
        1.5 | 
        14231 | 
        
        1.5 | 
       
      |