[Determination of dichlorobromomethane in water by headspace-trap gas chromatography/mass spectrometry].

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 degrees C 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 microg/L, and the correlation coefficient was 0.999 1. The detection limit was 0.03 microg/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.