Helium ion gas chromatograph and use method thereof

Abstract

The present invention discloses a helium ion gas chromatograph and a use method thereof. The helium ion gas chromatograph comprises a carrier gas source, a zero dead volume pressure stabilizing valve, a helium purification device, a zero dead volume four-way junction, a purging system inlet, a purging system outlet, a 5A molecular sieve chromatographic column, a detector, a back pressure valve and a sample device. The carrier gas source, the zero dead volume pressure stabilizing valve, the helium purification device and the zero dead volume four-way junction are sequentially communicated. The zero dead volume four-way junction is respectively communicated with the purging system inlet, the detector and the sample device. The purging system inlet and the purging system outlet are arranged on the sample device. The sample device, the 5A molecular sieve chromatographic column, the detector and the back pressure valve are sequentially communicated. With the present invention, the interference of the background impurities in the carrier gas is eliminated, the interference to the system due to the air is eliminated, the detection limit of the sample is improved, the separation effect of the chromatographic column is improved, and the accuracy and the stability of the experimental results are improved.

Description

technical field [0001] The invention relates to a gas chromatograph, in particular to a helium ion gas chromatograph and its application method. Background technique [0002] A gas chromatograph is a device that separates, analyzes and detects mixed samples, including a gas path system, a sampling system, a separation system, a circuit control system, a detection system, and a data acquisition and processing system. In the gas chromatograph, the carrier gas carries the sample to be separated through the stationary phase in the chromatographic column, so that the components in the sample are separated, and then they are detected by the detector respectively, and the components in the sample are collected through the data acquisition system The peak height or area is calculated to obtain the content of the required components. The Helium Ionization Detector (HID) is a general-purpose, high-sensitivity detector that responds positively to all species. [0003] The traditiona...

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Problems solved by technology

[0003] Traditional helium ion gas chromatographs will inject samples through different chromatographic columns through six-way valves or ten-way valves to obtain the required components when performing trace detection The problem with this method is that the background impurities in the carrier gas will reduce the sensitivity of the detector. When the system pressure is low, the oxygen and nitrogen in the air are more likely to penetrate into the detector and interfere with the cutting of the peak shape and the peak shape. The final quantification produces a large error, which reduces the accuracy of the experimental results

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