Joint device for total organic carbon analyzer and stable isotope mass spectrum

Abstract

The utility model relates to a joint device for a total organic carbon analyzer and a stable isotope mass spectrum. The joint device comprises a secondary water removal device, a carbon dioxide gas purification assembly, a carbon dioxide gas freezing enrichment device, a low-flow-rate helium source and a chromatographic column separation system which are arranged in sequence, the carbon dioxide gas freezing enrichment device comprises a first-stage stainless steel tube cold trap, a second-stage capillary tube cold trap and a six-way valve, the first-stage stainless steel tube cold trap is used for enriching CO2 in sample gas, the second-stage capillary tube cold trap is used for concentrating and purifying CO2 enriched by the first-stage stainless steel tube cold trap, one end of the first-stage stainless steel tube cold trap is connected with a first valve port of the six-way valve, the two ends of the secondary capillary cold trap are connected with a second valve port and a fifth valve port of the six-way valve respectively, the low-flow-rate helium source is connected with a third valve port of the six-way valve, the chromatographic column separation system is connected with a fourth valve port of the six-way valve, a sixth valve port of the six-way valve is an emptying valve port, and enrichment and separation of CO2 and emptying of impurity gas are achieved through switching of the six-way valve.

Description

technical field [0001] The invention relates to the field of organic carbon analysis, in particular to an interface device for coupling a total organic carbon analyzer and a stable isotope mass spectrometer. Background technique [0002] Dissolved organic carbon (DOC) exists in many different forms in water bodies, and its material composition is extremely complex, mainly composed of different amounts of carbohydrates, amino acids, nitrogen-containing organic substances, lipids, vitamins, nucleosides, It is composed of a mixture of oils, aromatic hydrocarbons, non-aromatic hydrocarbons and macromolecular humic acids. As the main energy source and carbon source for microbial metabolic activities, DOC not only affects the oxidation-reduction process of elements, but also determines the migration and transformation of carbon elements in water bodies to a certain extent, and is an important part of the carbon cycle in water bodies. Dissolved organic carbon isotopes (δ 13 C DO...

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Problems solved by technology

[0004] The purpose of the present invention is to solve the cumbersome test method of dissolved organic carbon isotopes in water bodies in the prior art, and the technical problems of the combination of total organic carbon analyzer (TOC) and stable isotope mass spectrometry (IRMS). 2 To solve the problems of low efficiency of separation, purification and enrichment, an interface device for coupling total organic carbon analyzer and stable isotope mass spectrometry is provided

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