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Table 2

Comparison of recoveries for THMs and I-THMs by using HS-SPME and LLE methods

Extraction techniquesTHMs
I-THMs
CHCl3CHBr3CHBr2ClCHBrCl2CHI3CH2ClI
HS-SPME/GC/ECD 
% Recovery (1,000 μg/L) 99.3 69.3 98.3 85.9 73.7 83.6 
SD 0.20 0.10 0.16 0.21 0.22 0.24 
RSD (%) 20.8 22.1 16.3 24.0 30.5 28.9 
LLE/GC/ECD 
% Recovery (1,000 μg/L) 95.0 69.4 91.1 71.5 69.8 79.9 
SD 0.25 0.11 0.21 0.20 0.17 0.20 
RSD (%) 26.3 24.1 23.1 28.0 26.9 25.0 
Extraction techniquesTHMs
I-THMs
CHCl3CHBr3CHBr2ClCHBrCl2CHI3CH2ClI
HS-SPME/GC/ECD 
% Recovery (1,000 μg/L) 99.3 69.3 98.3 85.9 73.7 83.6 
SD 0.20 0.10 0.16 0.21 0.22 0.24 
RSD (%) 20.8 22.1 16.3 24.0 30.5 28.9 
LLE/GC/ECD 
% Recovery (1,000 μg/L) 95.0 69.4 91.1 71.5 69.8 79.9 
SD 0.25 0.11 0.21 0.20 0.17 0.20 
RSD (%) 26.3 24.1 23.1 28.0 26.9 25.0 

SD = standard deviation; RSD = relative standard deviation.

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