| 摘要 |
PURPOSE:To obtain a stable chromatogram and to reduce the time for analysis by providing a gas flow passage for purging to the juncture between a precolumn of a sample evaporating chamber and a column for detection so that a high b.p. component is not admitted into the main column. CONSTITUTION:The upper part of the precolumn 12 contained in an outside pipe 11 in the evaporating chamber 1 is connected via a stop valve V1 to a septum purge flow circuit 7 and the lower part is connected to the column 2 for detection, a split system 3 and a four-way cock 4. The column 2 is constituted by connecting the capillary columns 2a, 2b in series via a branch pipe 5 and one end thereof is connected to the precolumn 12 and the other end to a detector 6. The branch pipe 5 is connected via a valve V4 to a carrier gas source. The cock 4 is changed over so that the high b.p. component in the column 12 flows backward and upward and is discharged from the valves V1, V3 at the point of the time when the low and middle b.p. components flow into the column 2a. The inflow of the high b.p. component into the column 2 is thus prevented. |
