A laser method for measuring the Fe isotope composition of Cr-rich geological samples

A geological sample and laser measurement technology, applied in the field of chemical analysis, to achieve the effect of avoiding the pretreatment process, wide application prospects, and improving application potential

Active Publication Date: 2022-06-21
INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI +1
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  • Abstract
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Problems solved by technology

[0007] In order to solve the problems existing in the prior art, the present invention provides a method for laser determination of the Fe isotope composition of Cr-rich geological samples. By synthesizing a Cr-rich glass standard sample similar to the rock sample, the Cr-rich glass standard sample is used. The mass fractionation factor is used to correct the Cr-rich geological samples to be tested. 54 Cr + right 54 Fe + interference, so as to obtain the Fe isotope composition in the Cr-rich geological sample to be measured more accurately, and solve the problem that the accurate Fe isotope analysis of the Cr-rich geological sample cannot be performed due to the interference of the mass spectrum during the laser in-situ analysis process, and by selecting The relevant parameter settings of the femtosecond laser ablation system and the use of the best cone combination reduce the instrument’s mass fractionation of Fe isotopes and mass spectrometry interference. Combined with a special calibration algorithm, the femtosecond laser combined with multi-receiver inductively coupled plasma mass spectrometry is accurate. Determination of the Fe isotopic composition of Cr-rich geological samples fills the gap in the laser in situ determination of Fe isotopic composition of Cr-rich geological samples, further enhances the application potential of laser in situ analysis technology in the field of geosciences, and has broad application prospects

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  • A laser method for measuring the Fe isotope composition of Cr-rich geological samples
  • A laser method for measuring the Fe isotope composition of Cr-rich geological samples
  • A laser method for measuring the Fe isotope composition of Cr-rich geological samples

Examples

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Embodiment 1

[0065] Example 1 Preparation of Cr-rich glass standard

[0066] The oxide powders of Si, Ti, Al, Na, Mg and Ca and the international standard material NIST SRM 979 (chromium nitrate nonahydrate, Cr (NO 3 ) 3 ·9H 2 O) After the powder is fully ground and uniform, put it into a platinum crucible, burn it in a high temperature furnace (KSL-1700X-A4) at 1500°C for 12 hours under normal pressure, and take it out. After it cools and solidifies into glass, the solidified The resulting glass is divided into ~1cm glass fragments, which are fixed on double-sided tape and injected with epoxy resin to make a 0.5-inch epoxy resin target, which is polished to expose the surface of the sample, polished and cleaned before waiting for testing.

[0067] Principal component analysis was performed on the synthesized Cr-rich glass (Cr-979S) standard sample using electron probe technique (EPMA). The photos under the microscope are as follows figure 1 The analysis results are shown in Table 1:

...

Embodiment 2

[0071] Example 2 Determination of Fe isotopic fractionation composition of geological samples using femtosecond laser for non-matrix matching correction

[0072] In this example, the IRMM-014 pure iron sample is used as the standard sample, the BCR-2G and BHVO-2G basaltic glass samples are used as the samples to be tested, and the femtosecond laser is used for laser ablation, and the ablated aerosol particles are introduced into the mass spectrometer. carry out testing. The influence of the femtosecond laser ablation process on the Fe isotopic composition of glass samples with different Cr contents was investigated, and the test results of the isotopic fractionation induced by the femtosecond laser were calculated and compared with the data reported by the solution method.

[0073] The specific detection process is as follows:

[0074] 1) Place the IRMM-014 pure iron sample, BCR-2G and BHVO-2G basaltic glass samples in the ablation tank at close range;

[0075] 2) Femtosecon...

Embodiment 3

[0084] Example 3 Influence of different cone combinations on the determination of Fe isotopic composition of basaltic glass samples

[0085] In this example, the femtosecond laser in-situ detection method as provided in Example 2 is used to measure the Fe isotopic composition of the basalt glass sample, which is divided into two groups according to the cone combination used, the first group is Jet skimmer + X sampling cone , the second group is the standard intercept cone + H sampling cone, the specific method is:

[0086] 1. Place the Cr-rich glass samples, BCR-2G and BHVO-2G basaltic glass samples in the ablation tank at close range;

[0087] 2. Use femtosecond laser (257nm 300fs) to ablate the Cr-rich glass sample, and introduce the ablated aerosol particles into a mass spectrometer equipped with a cone combination for testing;

[0088] 3. Use femtosecond laser (257nm 300fs) to ablate BCR-2G basaltic glass, and introduce the ablated aerosol particles into a mass spectromet...

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Abstract

The invention provides a method for measuring the Fe isotopic composition of Cr-rich geological samples by laser. By synthesizing Cr-rich glass standard samples, the mass fractionation factor of Cr in the Cr-rich glass standard samples is used to correct the Fe isotope composition in the Cr-rich geological samples to be measured. 54 Cr + right 54 Fe + interference, and by selecting the relevant parameter settings of the femtosecond laser ablation system and using the best cone combination, the mass fractionation in the process of measuring the Fe isotope of the instrument is reduced, and combined with a special correction algorithm, it is effectively deducted 54 Cr + right 54 Fe + Spectral peak interference, realize femtosecond laser combined with multi-receiver inductively coupled plasma mass spectrometry to accurately determine the Fe isotope composition of Cr-rich geological samples, fill the gap in the laser in situ determination of Fe isotope composition of Cr-rich geological samples, and improve the laser in situ analysis technology The application potential in the field of earth science has broad prospects.

Description

technical field [0001] The invention belongs to the technical field of chemical analysis, in particular to a method for measuring Fe isotopic composition of a Cr-rich geological sample by laser. Background technique [0002] Fe element is one of the most widely distributed and most important variable valence elements on earth (Fe 0 , Fe 2+ , Fe 3+ ), the precise determination of Fe isotopic composition can effectively trace the redox state of the ocean and the global biogeochemical cycles caused by multiple redox state changes. In addition, Fe isotopic composition is of great significance in tracing magmatic processes (such as partial melting, magmatic differentiation, etc.), as well as ore-forming fluid activities and sources of ore-forming materials. [0003] In previous studies, the determination of Fe isotopic composition was mainly based on the overall analysis of rock samples or mineral samples, that is, all the samples to be tested were digested into solutions and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/626G01N1/28
CPCG01N27/62G01N1/28
Inventor 许蕾杨进辉张文罗涛胡兆初
Owner INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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