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Table 1

Instrumental configuration and analysis conditions

Chromatographic system 
Gas chromatograph Agilent Model 6890 N 
Inlet split/splitless 
Detector Agilent 5973 MSD 
Column 30 m × 0.25 mm × 0.25 μm 
Fibre carboxen/polydimethylsiloxane (carboxen/PDMS 75 μm, SUPELCO) 
Experimental conditions 
Inlet temperature 250 °C 
Injection volume 1 μL 
Injection mode splitless 
Purge time 2.00 min 
Purge flow 50 mL/2.00 min 
Carrier gas He 
Flow velocity 23.3 mL/min 
Oven temperature 40 °C, 5 min initial, 20 °C/min to 280 °C 
Detector temperature 270 °C 
Desorption time 10 min 
Micro-extraction time 20 min 
The m/z fragment 
monochloroacetic acid (MCAA) 77 as 100%, 29 as 53% and 49 as 41% 
monobromoacetic acid (MBAA) 123 as 100%, 121 as 88% and 29 as 29% 
dichloroacetic acid (DCAA) 83 as 100%, 29 as 70% and 85 as 68% 
trichloroacetic acid (TCAA) 117 as 100%, 119 as 98% and 29 as 55% 
bromochloroacetic acid (BCAA) 129 as 100%, 29 as 54% and 109 as 36% 
dibromoacetic acid (DBAA) 173 as 100%, 174 as 98% and 29 as 41% 
The % recovery retention time calibration curve/concentration range 
Mix compounds 99.98%   6.10–10.7 min  20–220 μg/L 
Chromatographic system 
Gas chromatograph Agilent Model 6890 N 
Inlet split/splitless 
Detector Agilent 5973 MSD 
Column 30 m × 0.25 mm × 0.25 μm 
Fibre carboxen/polydimethylsiloxane (carboxen/PDMS 75 μm, SUPELCO) 
Experimental conditions 
Inlet temperature 250 °C 
Injection volume 1 μL 
Injection mode splitless 
Purge time 2.00 min 
Purge flow 50 mL/2.00 min 
Carrier gas He 
Flow velocity 23.3 mL/min 
Oven temperature 40 °C, 5 min initial, 20 °C/min to 280 °C 
Detector temperature 270 °C 
Desorption time 10 min 
Micro-extraction time 20 min 
The m/z fragment 
monochloroacetic acid (MCAA) 77 as 100%, 29 as 53% and 49 as 41% 
monobromoacetic acid (MBAA) 123 as 100%, 121 as 88% and 29 as 29% 
dichloroacetic acid (DCAA) 83 as 100%, 29 as 70% and 85 as 68% 
trichloroacetic acid (TCAA) 117 as 100%, 119 as 98% and 29 as 55% 
bromochloroacetic acid (BCAA) 129 as 100%, 29 as 54% and 109 as 36% 
dibromoacetic acid (DBAA) 173 as 100%, 174 as 98% and 29 as 41% 
The % recovery retention time calibration curve/concentration range 
Mix compounds 99.98%   6.10–10.7 min  20–220 μg/L 
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