Abstract: A gas chromatography-mass spectrometry (GC-MS) method has been established for the determination of methyl carbamate and ethyl carbamate in white liquor. The GC-MS conditions were column HP-55% phenylmethyl Siloxane (30.0 m × 0.25 mm, 0.25μm) as the chromatography column, injection volume of 1μL (split ratio, 50:1), column temperature of 170 ℃, ion source temperature of 230 ℃, quadrupole temperature of 150 ℃, mass scanning range (m/z) of 30－500 and solvent delay time of 3 min. The samples were purified by amino solid phase extraction column and then the eluent was evaporated to dryness using nitrogen blow. The results showed that the standard curves of methyl carbamate and ethyl carbamate revealed an excellent linear relationship in the concentration range of 2－30μg/mL with a correlation coefficient of respectively 0.9923 and 0.9811. The average recovery rates of this determination method for methyl carbamate and ethyl carbamate were 76.10% and #br# 75.43% with a RSD of 4.48% and 4.00%, respectively.

Key words: GC-MS, methyl carbamate, ethyl carbamate, liquor