Method for analyzing sulfur stable isotopes in seawater by using sulfur monoxide ion technology

A technology of stable isotope and ion technology, which is applied in the field of stable isotope analysis, can solve the problems of affecting the detection results, difficult to focus the receiver, etc., and achieve good reproducibility, easy operation, and improved accuracy and reproducibility.

Inactive Publication Date: 2021-04-30
TIANJIN NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When switching from carbon and nitrogen isotope detection to sulfur isotope detection, due to the influence of the memory effect of the instrument, SO with a high mass-to-charge ratio 2 + Difficult to effectively focus on the receiver, affecting detection results

Method used

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  • Method for analyzing sulfur stable isotopes in seawater by using sulfur monoxide ion technology
  • Method for analyzing sulfur stable isotopes in seawater by using sulfur monoxide ion technology
  • Method for analyzing sulfur stable isotopes in seawater by using sulfur monoxide ion technology

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A method for analyzing sulfur stable isotopes in seawater with sulfur monoxide ion technology, comprising the following steps:

[0021] a. Filter and acidify the seawater sample to remove carbonate, then add barium chloride to form a barium sulfate precipitate to fix the sulfate radical, filter again to collect the barium sulfate precipitate, and evaporate the precipitate to dryness at 50°C , Accurately weigh 5.0 mg of the precipitate into a tin cup and wrap it.

[0022] b. IAEA-S-1 (silver sulfide, δS34=-0.30‰), IAEA-S-3 (silver sulfide, δS34=-32.3‰), NBS-127 (barium sulfate, δS34=20.3‰) is the standard product.

[0023] c. Use an element analyzer-stable isotope mass spectrometer to detect the sample to be tested; the parameters of the element analyzer are: oxidation furnace 980 ° C, column oven 90 ° C, the catalyst in the quartz tube in the oxidation furnace is 25 grams of tungsten oxide and granular 50 grams of pure copper.

[0024] d. The high-energy ion source i...

Embodiment 2

[0032] A method for analyzing sulfur stable isotopes in seawater with sulfur monoxide ion technology, comprising the following steps:

[0033] a. Filter and acidify the seawater sample to remove carbonate, then add barium chloride to form a barium sulfate precipitate to fix the sulfate radical, filter again to collect the barium sulfate precipitate, and evaporate the precipitate to dryness at 50°C , Accurately weigh 1.0, 2.5, 4.0, 5.5, 7.0, 8.5, 10.0 mg of sediment respectively into tin cups and wrap.

[0034] b. IAEA-S-1 (silver sulfide, δS34=-0.30‰), IAEA-S-3 (silver sulfide, δS34=-32.3‰), NBS-127 (barium sulfate, δS34=20.3‰) is the standard product.

[0035] c. Use an element analyzer-stable isotope mass spectrometer to detect the sample to be tested; the parameters of the element analyzer are: oxidation furnace 980 ° C, column oven 90 ° C, the catalyst in the quartz tube in the oxidation furnace is 25 grams of tungsten oxide and granular 50 grams of pure copper.

[0036...

Embodiment 3

[0044] comparative test

[0045]

[0046] In summary, the method of the present invention has the advantages of high precision, good reproducibility, easy maintenance, etc., and can be used for accurate detection of sulfur isotopes in seawater samples.

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PUM

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Abstract

The invention discloses a method for detecting sulfur stable isotopes in a seawater sample in an SO+ mode, which comprises the following specific steps: filtering, acidifying, precipitating and evaporating the seawater sample to dryness, filling a tin cup with the seawater sample, wrapping, and detecting the sample to be detected by using an element analyzer-stable isotope mass spectrometer. By tuning the voltage of the electron bombardment source and the focusing electrode, the high-energy electron flow is utilized to perform secondary ionization on SO2+ so as to generate SO+ for sulfur isotope detection, thereby enhancing the efficiency and accuracy of the sulfur isotope ratio of the seawater sample.

Description

[0001] The present invention is funded by Tianjin Higher Education Science and Technology Development Project (2018KJ160) and Tianjin Normal University Education Fund (043-135202WT1703). technical field [0002] The invention belongs to the technical field of stable isotope analysis, and in particular relates to a method for analyzing sulfur stable isotopes in seawater with sulfur monoxide ion technology. Background technique [0003] In recent years, with the continuous progress and development of stable isotope analysis technology, its application in environmental protection and agricultural production has become increasingly mature. There have been many research reports on the use of sulfur stable isotopes to study the migration and transformation mechanism of sulfur in the marine environment and the traceability of pollutants. [0004] At present, the common sulfur stable isotope analysis method is the combination of an elemental analyzer and a mass spectrometer, that is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/62
CPCG01N27/62
Inventor 高健沙健李雪李静尚云涛王义东袁立伟
Owner TIANJIN NORMAL UNIVERSITY
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