| Reagent | 
        [SILC]    Taken µg    mL-1 | 
        [SILC]    Found* µg    mL-1 | 
        % Recovery | 
        SD | 
        RSD    (%) | 
       
      
        | BTB | 
        20.00 
                30.00 
                40.00 | 
        20.00 
                30.30 
                40.20 | 
        100.0 
                101.0 
                100.5
              | 
        0.026 
                0.052 
                0.071 | 
        0.13 
                0.17 
                0.18 | 
       
      
        | BPB | 
        10.00 
                30.00 
                50.00 | 
        9.80 
                30.45 
                49.50
              | 
        98.00 
                101.50 
                99.00 | 
        0.034 
                0.063 
                0.041 | 
        0.35 
                0.20 
                0.08 | 
       
      
        | EBBR | 
        20.00 
                40.00 
                60.00 | 
        20.00 
                39.40 
                61.00 | 
        100.0 
                98.50 
                101.6 | 
        0.052 
                0.073 
                0.046 | 
        0.26 
                0.19 
                0.08 | 
       
     
    *Average of four determination |