Abstract: A novel method was developed for the determination of dichlorobromomethane in water using headspace-trap gas chromatography/mass spectrometry (GC/MS). Three parameters of headspace-trap including thermostatic temperature, time and cycle number were optimized by orthogonal experiment analysis. Dichlorobromomethane in water samples was analyzed under the optimized conditions of 70 ℃ and 20 minutes with the cycle number of two. The results showed that the calibration curve was linear in the range of 0.1~10.0 μg/L, and the correlation coefficient was 0.9991. The detection limit was 0.03 μg/L. The average recovery was 83.1%~111.3% with the relative standard deviation (RSD) not more than 5.2% (n=6). This method is rapid, sensitive and reproducible for the routine detection of the low concentration of dichlorobromomethane in water.

Key words: dichlorobromomethane, gas chromatography/mass spectrometry (GC/MS), water , headspace trap