Device and method for switching between comprehensive two-dimensional gas chromatography and one-dimensional gas chromatography

Abstract

The invention discloses a device and a method for switching between comprehensive two-dimensional gas chromatography and one-dimensional gas chromatography. The switching device comprises a gas supplement module, a switching switch, first to fourth interfaces, a first air resistor and a second air resistor, wherein a first end of the second interface is connected with a first end of the second airresistor through a first pipeline; a second end of the second air resistor is connected with a first end of the third interface through a second pipeline; the outlet of the gas supplement module is connected with the switching switch through a third pipeline; a first outlet of the switching switch is connected with the first pipeline on a first node through a fourth pipeline; a second outlet of the switching switch is connected with the first pipeline on a second node through a fifth pipeline; two ends of the first air resistor are connected with the fourth pipeline and the fifth pipeline respectively; a first end of the first interface is connected with the first pipeline between the first node and the second node through a pipeline; a first end of the fourth interface is connected withthe second pipeline through a pipeline. The device and the method can automatically switch between the comprehensive two-dimensional gas chromatography and the one-dimensional gas chromatography, andthe demand of alternatively using the comprehensive two-dimensional gas chromatography and the one-dimensional gas chromatography with one instrument is met.

Description

technical field [0001] The invention relates to the technical field of analytical instruments, in particular to a device for switching between comprehensive two-dimensional gas chromatography and one-dimensional comprehensive two-dimensional gas chromatography. Background technique [0002] Comprehensive Two-dimensional Gas Chromatography (GC×GC for short) is a new chromatographic analysis technique developed on the basis of traditional one-dimensional gas chromatography in the 1990s. The main principle is to connect two chromatographic columns with different separation mechanisms and independent of each other in series, and a modulator is installed in the middle. Periodic pulses are released into a second column for continued separation and finally to a chromatographic detector. In this way, the components (co-distillates) that are not completely separated in the first dimension are further separated in the second dimension, and the effect of orthogonal separation is achie...

AI Technical Summary

Problems solved by technology

In some modulators, the flow path passes outside the furnace, and the non-operating state cannot maintain a proper temperature, causing the analytes in the flow path to be blocked in the cooled modulator pipeline and cannot flow out smoothly

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