Marine tracer gas h2/ch4/co2/h2s multidimensional chromatographic analysis method and system

Abstract

The invention belongs to the technical field of gas chromatographic analysis, and in particular relates to a method and system for multidimensional chromatographic analysis of marine tracer gas H2 / CH4 / CO2 / H2S. It is composed of split / splitless inlet, PoraPLOT Q column, 5A molecular sieve column, electronic switching valve, pulse helium ionization detector, thermal conductivity detector and flame photometric detector, etc. PoraPLOT Q column is respectively connected to split / splitless inlet The sample port and the electronic switching valve, the 5A molecular sieve column are respectively connected to the electronic switching valve and the pulse helium ionization detector, the three-way splitter is respectively connected to the electronic switching valve and the damping tube, and the two damping tubes are respectively connected to the thermal conductivity detector and the flame photometric detection device. The specific steps are: H2, CH4 and other gases separated by the PoraPLOT Q column are further separated on a 5A molecular sieve column, and the H2 and CH4 tests are completed by a pulsed helium ionization detector; after the CH4 gas flows out of the PoraPLOT Q column, two three The air flow is cut by the electronic switching valve, so that the CO2 and H2S separated by the PoraPLOT Q column are divided by the three-way splitter, and analyzed by the thermal conductivity detector and the flame photometric detector. The invention has a simple structure, avoids using multiple methods to test separately, saves a lot of time, and saves sample demand.

Description

technical field [0001] The invention belongs to the technical field of gas chromatography analysis, in particular to a marine tracer gas H 2 / CH 4 / CO 2 / H 2 S multidimensional chromatographic analysis method and system. Background technique [0002] Submarine hydrothermal activities will eject a large amount of H 2 、CH 4 , CO 2 and H 2 Gases such as S, and the disturbed decomposition of natural gas hydrates will also release a large amount of hydrocarbon gases such as CH4, resulting in an abnormally high content distribution of gases in seawater. By quickly detecting and tracking the abnormal distribution characteristics of these tracer gases, it can provide fast and effective clues for searching for resources such as seabed hydrothermal sulfide and gas hydrate. For the analysis of these tracer gases, different methods are usually used to detect these gases, such as gas chromatography, infrared method, gravimetric method, etc. This is not only time-consuming and la...

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Problems solved by technology

This is not only time-consuming and labor-intensive, but also wastes a lot of valuable deep-sea samples; in addition, due to the complexity of gas components and low gas concentration, to accurately test the gas concentration, it is necessary to have a high-sensitivity detector and a suitable test. method

[0003] The analysis of complex samples often requires the use of two-dimensional or multidimensional chromatography techniques, although various types of two-dimensional or multidimensional chromatography systems with multiple columns, double-column thermostats, and flow-distributed multidimensional chromatography have been developed. However, there are few involving three detectors, which can simultaneously detect a variety of gas components with completely different properties in the ocean, especially for H 2 The high-sensitivity test of the high-sensitivity test is relatively difficult. At present, only the pulsed helium ionization detector (PDHID) can be completed. Kelley D S of the University of Washington in the United States has simultaneously completed the H 2 and CH 4 Simultaneous testing of gases

However, this method cannot simultaneously analyze H in water samples. 2 S and CO 2 gas

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