[Comparison of the capacity of a sol-gel-coated poly(dimethylsiloxane) capillary column and a conventional column]

The sample capacity is an important parameter of the gas chromatographic column. On a sol-gel-coated poly(dimethylsiloxane) (PDMS) capillary column and a conventional PDMS capillary column the probes undecane and fluoranthene were injected and the column efficiency was measured. After the injection amount was increased to a certain point, the column efficiency was reduced rapidly, and the amount that causes the efficiency reduction of ten percent is called the sample capacity of the column. The results show that the sample capacity of the sol-gel PDMS column is much higher than that of the conventional PDMS column. The reasons of higher sample capacity of a sol-gel column have been studied.