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Method for online analysis of hydrogen isotope in fluid inclusion water

A technology of fluid inclusions and hydrogen isotopes, which is applied in the fields of analysis of materials, material separation, measurement devices, etc., can solve the problems of high accuracy, high sensitivity and cumbersome experimental process, so as to reduce the detection limit, improve the test quality, and improve the sensitivity. Effect

Active Publication Date: 2018-05-25
INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to overcome the large analysis errors, high sample consumption, cumbersome experimental process and low efficiency of the existing off-line analysis technology of hydrogen isotope in fluid inclusion water, as well as the existing high-temperature cracking / on-line continuous flow of elements and isotopes. The analysis method is not suitable for the on-line analysis of hydrogen isotopes in fluid inclusion water, and the analysis method of pyrolysis / on-line continuous flow of elements and isotopes cannot maximize the use of sample gas, high instrument detection limit, low precision and other defects. Provide A method for on-line analysis of hydrogen isotopes in fluid inclusion water, which can realize rapid analysis of hydrogen isotopes in trace amounts of fluid inclusion water, solves the problem that it is difficult to analyze when the water content of fluid inclusions is low, and the analysis process is simple and controllable, easy operation, the sample gas can be used to the maximum extent, the detection limit of the instrument is low, the sensitivity is high, the analysis error is small, and the accuracy is high

Method used

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  • Method for online analysis of hydrogen isotope in fluid inclusion water
  • Method for online analysis of hydrogen isotope in fluid inclusion water
  • Method for online analysis of hydrogen isotope in fluid inclusion water

Examples

Experimental program
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Embodiment 1

[0082] (1) Assemble the instruments and devices required for on-line analysis of hydrogen isotopes in fluid inclusion water

[0083] like image 3 As shown, the elemental analyzer is sequentially connected with the enrichment device, the gas chromatographic column i and the isotope ratio mass spectrometer, wherein the enrichment device includes an eight-way valve d, a sample tube g and a Dewar bottle filled with liquid nitrogen. The gas outlet of the elemental analyzer and one end of the gas chromatographic column i are respectively connected to the two interfaces of the eight-way valve d, and the other end of the gas chromatographic column i is connected to the isotope ratio mass spectrometer through an open split flow interface j Connectivity settings.

[0084] like Figure 4 As shown, the gas outlet of the elemental analyzer communicates with the second port 2 of the eight-way valve d in the enrichment device, and the fifth port 5 of the eight-way valve d communicates wit...

Embodiment 2

[0092] According to the method of Example 1, the instruments and devices required for the on-line analysis of hydrogen isotopes in fluid inclusion water are assembled and the on-line analysis of hydrogen isotopes in fluid inclusion water is carried out. The material for encapsulating the body is a silver cup. The analysis results are shown in Table 1. The same fluid inclusions of the same weight were weighed, and the above analysis process was repeated 6 times, and the results of each analysis are shown in Table 2.

Embodiment 3

[0094] According to the method of Example 1, the various instruments and devices required for online analysis of hydrogen isotopes in fluid inclusion water are assembled and the online analysis of hydrogen isotopes in fluid inclusion water is carried out. The difference is that the inner diameter of the sample tube g is 0.5mm , the wall thickness of the sample tube g is 0.2 mm, the sample ring h is located in the middle of the sample tube g, and the middle part of the sample tube g is wound 2 times to form a spiral sample ring h with a diameter of 5 cm. Filled with activated carbon. The analysis results are shown in Table 1. The same fluid inclusions of the same weight were weighed, and the above analysis process was repeated 6 times, and the results of each analysis are shown in Table 2.

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Abstract

The invention relates to the technical field of stable isotope analysis, and discloses a method for an online analysis of hydrogen isotope in fluid inclusion water. The method is characterized by comprising the following steps: (I) enabling water in fluid inclusion to be released by utilizing a dynamic flash burn method and performing reduction reaction to generate a hydrogen-containing gas mixture; (II) carrying out enrichment on the hydrogen-containing gas mixture generated in step (I) by adopting an enrichment device; (III) separating hydrogen from the hydrogen-containing gas mixture enriched in step (II) by utilizing a gas chromatographic column; (IV) introducing the hydrogen separated in step (III) into an ion source of an isotope ratio mass spectrometer through an opening flow-splittype interface, and analyzing the hydrogen isotope in the fluid inclusion water to obtain a hydrogen isotope ratio. The method not only can meet the requirement of a mass spectrometer ion source on gas flow, but also can be used for introducing generated sample gas into the isotope ratio mass spectrometer to the utmost extent, the limit of detection is low, the analytic error is small, and the degree of accuracy is high.

Description

technical field [0001] The invention relates to the technical field of stable isotope analysis, in particular to a method for online analysis of hydrogen isotopes in fluid inclusion water. Background technique [0002] Fluid inclusions in diagenetic minerals are the inclusions of diagenetic ore-forming fluids due to factors such as crystal growth mechanism, growth rate, changes in the concentration of certain (some) components, or multi-phase interface interactions during the mineral crystal growth process. The rock-forming and ore-forming fluids in the mineral lattice defects or caves, which are still sealed in the main minerals and have a phase boundary with the main minerals, are the original samples of rock-forming and mineralization preserved so far. The study of hydrogen isotopes in fluid inclusions in ore deposits and dike rocks is of great significance for exploring the properties, sources, evolution and genesis of ore-forming fluids. [0003] At present, the analys...

Claims

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Application Information

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IPC IPC(8): G01N30/02G01N30/08
CPCG01N30/02G01N30/08
Inventor 李洪伟冯连君李铁军
Owner INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI