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Analysis system and analysis method for trace sulfur isotopes in sulfide and sulfate

A sulfur isotope and analysis system technology, which is applied in the field of trace sulfur isotope analysis systems in sulfide and sulfate, can solve the problems of unachievable sulfur isotope analysis and testing, large sample consumption, and high cost of consumables, so as to reduce experimental costs and utilization rates The effect of improving and increasing the service life

Pending Publication Date: 2020-08-18
INST OF MINERAL RESOURCES CHINESE ACAD OF GEOLOGICAL SCI
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Problems solved by technology

[0007] In view of the above reasons, the present invention aims to provide a trace sulfur isotope analysis system and analysis method in sulfide and sulfate, which is used to solve the problem of large sample consumption, low analysis efficiency, high cost of consumables, and the inability to achieve trace sulfur isotope analysis in existing analysis methods. Problems with Sulfur Isotope Analysis Tests in Sulfides and Sulfates

Method used

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  • Analysis system and analysis method for trace sulfur isotopes in sulfide and sulfate
  • Analysis system and analysis method for trace sulfur isotopes in sulfide and sulfate
  • Analysis system and analysis method for trace sulfur isotopes in sulfide and sulfate

Examples

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Embodiment 1

[0060] A specific embodiment of the present invention discloses a trace sulfur isotope analysis system in sulfide and sulfate, such as Figure 1 to Figure 2 As shown, it includes an elemental analyzer, a gas pre-concentration and purification device 3 and a mass spectrometer 4; one end of the gas pre-concentration and purification device 3 is connected to the elemental analyzer, and the other end is connected to the mass spectrometer 4 through a universal interface 11.

[0061] In this embodiment, the elemental analyzer includes an autosampler 1 and a redox tube 2, the autosampler 1 is used to send the sample to be tested into the redox tube 2, and the autosampler 1 is provided with a helium load The helium carrier gas inlet 1-1 for gas and the oxygen inlet 1-2 for supplying oxygen; the redox tube 2 is used for the redox reaction of the sample to be tested to obtain SO 2 One end of the redox tube 2 is connected to the autosampler 1 through a pipeline, and the other end is conn...

Embodiment 2

[0077] Another embodiment of the present invention discloses a method for analyzing trace sulfur isotopes in sulfides and sulfates, based on the system for analyzing trace sulfur isotopes in sulfides and sulfates of Example 1, comprising the following steps:

[0078] Step 1: Prepare the sample to be tested.

[0079] Before carrying out the micro sample sulfur isotope test experiment, prepare the sample to be tested, which is sulfide or sulfate, and grind the sample to be tested to more than 200 mesh. Among them, the sulfide sample was ground to 200 mesh and directly wrapped in a tin cup or aluminum cup, and the sulfate sample was ground to 200 mesh and added 3 times the weight of V 2 o 5 powder, sulphate sample with added V 2 o 5 The powder is blended and wrapped in tin or aluminum cups. The sample amount ranged from 30-100 μg for sulfide and 150-600 μg for sulfate.

[0080] Step 2: Set the six-way valve 5 to the gas enrichment mode, and the autosampler 1 sends the sample...

Embodiment 3

[0093] In order to verify that the present invention can meet the analysis requirements of trace sulfur isotopes in precious samples and micro-area samples, and the test results reach the international advanced level, this example is based on the analysis system of Example 1, and utilizes the analysis method of Example 2 to analyze sulfide and Sulfate reference material was tested.

[0094] The selected national sulfide sulfur isotope standard materials are GBW04414, GBW04415 and the international sulfide sulfur isotope standard material IAEA-S-3, the composition of which is Ag 2 S; The selected international sulfate sulfur isotope standard materials IAEA-SO-5, IAEA-SO-6 and NBS-127, the composition is BaSO 4 The purity of the selected standard samples of sulfide and sulfate is greater than 99.9%, and the sample weights are 30-100 μg and 150-600 μg respectively. The selected standard material samples are ground to more than 200 mesh and wrapped in tin cups for measurement. Wh...

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Abstract

The invention relates to an analysis system and an analysis method for trace sulfur isotopes in sulfide and sulfate, belongs to the technical field of stable isotope testing, and solves the problems that an existing analysis method is large in sample consumption, low in analysis efficiency and high in consumable cost and cannot realize analysis and testing of the sulfur isotopes in the trace sulfide and sulfate. The analysis system and an analysis method for trace sulfur isotopes in sulfide and sulfate comprises an element analyzer, a gas pre-concentration and purification device and a mass spectrometer; the gas pre-concentration and purification device is used for enriching and purifying SO2 gas, one end of the gas pre-concentration and purification device is connected with the element analyzer, and the other end of the gas pre-concentration and purification device is connected with the mass spectrometer through a universal interface. The system and method have the advantages of smallsample consumption, high analysis efficiency, low consumable cost, realization of analysis and test of sulfur isotopes in trace sulfides and sulfates, analysis precision superior to 0.20% o (1 sigma), and reaching of the advanced level of international similar laboratories.

Description

technical field [0001] The invention relates to the technical field of stable isotope testing, in particular to a trace sulfur isotope analysis system and analysis method in sulfide and sulfate. Background technique [0002] Sulfur has a large isotopic fractionation in geological processes, so sulfur isotopes are effective tracers for understanding the evolution history of sulfur-containing substances in nature, and have been widely used in the study of magma, sedimentation, hydrothermal, biological and atmospheric processes. have attracted the attention of geologists. [0003] Early sulfur isotope analysis methods used dual injection SO 2 and SF 6 method, this method needs to convert the sulfur in the sample into the gas SO to be measured before the mass spectrometry test 2 or SF 6 , and then send the gas to be tested into the mass spectrometer through the reference gas dual-channel sampling system. The test process is time-consuming and laborious, and the sample pre-tr...

Claims

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Application Information

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IPC IPC(8): G01N30/02G01N30/06G01N30/08G01N30/26G01N30/72
CPCG01N30/02G01N30/06G01N30/08G01N30/26G01N30/72
Inventor 范昌福武晓珮胡斌高建飞李延河
Owner INST OF MINERAL RESOURCES CHINESE ACAD OF GEOLOGICAL SCI
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