| 
      
        |  |  | Spiked TMHP concentration (ng/ml) | Measured TMHP concentration (ng/ml) | RSD (%) | RE (%) |  
        | Within-run | Day 1, n=5 | 1.990 | 1.894 | 3.8 | -4.8 |  
        | 5.970 | 5.945 | 6.1 | -0.4 |  
        | 99.50 | 91.46 | 3.7 | -8.1 |  
        | 298.5 | 276.0 | 6.0 | -7.6 |  
        | Day 2, n=5 | 1.990 | 2.238 | 4.4 | 12.4 |  
        | 5.970 | 6.168 | 3.8 | 3.3 |  
        | 99.50 | 91.36 | 1.9 | -8.2 |  
        | 298.5 | 273.2 | 1.6 | -8.5 |  
        | Day 3, n=5 | 1.990 | 2.040 | 9.5 | 2.5 |  
        | 5.970 | 6.089 | 6.2 | 2.0 |  
        | 99.50 | 95.78 | 3.5 | -3.7 |  
        | 298.5 | 295.1 | 2.5 | -1.1 |  
        | Between-run | 3 days, n=15 | 1.990 | 2.057 | 9.3 | 3.4 |  
        | 5.970 | 6.067 | 5.3 | 1.6 |  
        | 99.50 | 92.87 | 3.7 | -6.7 |  
        | 298.5 | 281.4 | 5.0 | -5.7 |  |