Abstract: Methods the automatic purge and capture technology was used. By optimizing the blowing time, chromatographic column, detector and quantitative method, the trace amount of epichlorohydrin in drinking water was enriched and analyzed. The selective ion mode （SIM） was used to detect the trace epichlorohydrin in the drinking water. The extracted characteristic ions were quantitatively analyzed by internal standard method. Results the epichlorohydrin in drinking water was linear in the range of 0.02~2.00 μg/L, and the linear correlation coefficient was 0.999 6. The detection limit of this method was 0.01 μg/L. When the addition level was 0.05, 0.40, 1.00 μg/L, the recovery rate of epichlorohydrin was 92.33% to 103.81%, and 6 times, RSD was repeated. It is 2.17% to 6.59%. The method is highly automatic, sensitive, accurate and reproducible for the determination of trace epichlorohydrin in drinking water.

Key words: purge and trap, gas chromatography-mass spectrometry, drinking water, epichlorohydrin