The total separating size(K1) of CD4 and CH4 was detected by quadrupole mass spectrometer on line, and the relation of K1 and vary chromatographic conditions and sample volume were tested.

• 采用四极质谱仪在线测定了CD4和CH4同位素色谱总分离度(K1)与色谱条件、进样量之间的关系。