Element isotope analysis system, analysis method of sulfur isotope in trace sulfate sample and application thereof

An analysis system and analysis method technology, applied in the field of element isotope analysis, can solve the problems that the isotope continuous flow analysis method cannot be applied to the analysis of trace samples, the experimental process is cumbersome, and the sample consumption is large, and the analysis error is small and the detection limit of the instrument is low. , the effect of reducing interference

Pending Publication Date: 2020-06-12
INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the problem that the isotope off-line analysis method existing in the prior art consumes a lot of samples, the experimental process is cumbersome, and the efficiency is low, and...

Method used

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  • Element isotope analysis system, analysis method of sulfur isotope in trace sulfate sample and application thereof
  • Element isotope analysis system, analysis method of sulfur isotope in trace sulfate sample and application thereof
  • Element isotope analysis system, analysis method of sulfur isotope in trace sulfate sample and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0105] (1) Assemble the instruments and devices of the online element isotope analysis system

[0106] Such as figure 2 As shown, the elemental analyzer is sequentially connected with the enrichment device, the gas chromatographic column and the isotope ratio mass spectrometer, wherein the enrichment device includes an eight-way valve, a sample tube and a cooling trap, and two ports of the eight-way valve are respectively connected to The gas outlet of the elemental analyzer is connected to the inlet of the gas chromatographic column, the other two ports of the eight-way valve are connected through the sample tube, and the outlet of the gas chromatographic column is connected to the isotope ratio mass spectrometer through an open split port. The heating device is arranged around the sampling port, the sampling valve and the ion source of the isotope ratio mass spectrometer, and a control module is provided to regulate the temperature of the heating device.

[0107] Such as ...

Embodiment 2

[0120] With reference to the method described in Example 1, analyze the sulfur isotope ratio of the same sulfate sample of the same quality, the difference is that V 2 o 5 Replace potassium metaphosphate, all the other are identical with embodiment 1. The analysis results are shown in Table 1. Take the same kind of sulfate sample with the same quality, and the ratio of the sulfate sample to the accelerator is the same as in Example 1, repeat the above analysis process 6 times, and the results of each analysis are shown in Table 2.

Embodiment 3

[0122] Referring to the method described in Example 1, the sulfur isotope ratio of the same sulfate sample of the same quality was analyzed, except that the amount of potassium metaphosphate was 300 μg, and the rest were the same as in Example 1. The analysis results are shown in Table 1. Take the same sulfate sample of the same quality and repeat the above analysis process 6 times, and the results of each analysis are shown in Table 2.

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Abstract

The invention relates to the field of element isotope analysis, and particularly discloses an element isotope analysis system, an analysis method of sulfur isotopes in a trace sulfate sample and application of the analysis method. The system comprises an element analyzer, an enrichment device, a gas chromatographic column, an isotope ratio mass spectrometer and a heating device which are connectedin sequence, and pipelines for connecting or communicating equipment, wherein the pipeline used for connecting or communicating the equipment is a Teflon pipe, the gas chromatographic column is a chromatographic column made of a Teflon material, the enrichment device comprises a multi-way valve, a sample tube and a cooling trap, at least one part of the sample tube can be arranged in the coolingtrap to realize enrichment, and the heating device is arranged around the sample inlet, the sample inlet valve and the ion source of the isotope ratio mass spectrometer. The analysis method is simple,controllable, easy to operate, capable of utilizing the sample to the maximum extent, low in instrument detection limit, high in sensitivity, small in analysis error and high in accuracy.

Description

technical field [0001] The invention relates to the field of element isotope analysis, in particular to an element isotope analysis system and a method for analyzing sulfur isotope in trace sulfate samples and its application. Background technique [0002] Sulfate is a common ion in nature. It exists in large quantities in natural water bodies such as oceans. In recent years, with the large-scale development of human industrial and agricultural production, the concentration of sulfate radicals in inland lakes and other water bodies has increased, and the concentration of sulfate radicals in groundwater in coastal areas has also increased due to intrusion of seawater. Sulfate in groundwater mainly comes from the following sources: atmospheric precipitation, dissolution of evaporites, oxidation of sulfides, and mineralization of organic sulfur in soil belts. Coastal areas are also affected by seawater intrusion or transported sea salt recharged by precipitation. Sulfate conc...

Claims

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Application Information

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IPC IPC(8): G01N30/06G01N30/08G01N30/20G01N30/30G01N30/72
CPCG01N30/06G01N30/08G01N30/20G01N30/30G01N30/7206G01N2030/067G01N2030/121G01N2030/201
Inventor 李洪伟冯连君
Owner INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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