| 摘要 |
PURPOSE:To enable a highly accurate estimation of trace gas component B by a method wherein a sample gas to containing a trace gas component B in a gas component A flows to first column and immediately before the outflow of the component B, a carrier gas is reversed to the first column and sent to the second column. CONSTITUTION:When first and second columns 2 and 3 are used to analyze a sample gas containing a trace gas component B in a gas component A, first, the sample gas 6 is introduced to the first column to release the component A previously flowing out until the time immediately before the component B is allowed to flow out. Then, a carrier gas is reversed to the column 2 from a tube 8 and introduced to the second column 3 from a pipe 9 so that the peak of the component B following the component A previously flowing is set at the valley 14. This enables clear separation and detection to improve the limit to the estimation of the trace component B to 2ppm from 10ppm. |
