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Surface water sulfur stable isotope analysis technology and application

A stable isotope and analysis technology, which is applied in the field of surface water sulfur stable isotope analysis, can solve the problems affecting the detection results, difficult to focus the receiver, etc., achieve high analysis efficiency, good reproducibility, and improve accuracy and reproducibility Effect

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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  • Surface water sulfur stable isotope analysis technology and application
  • Surface water sulfur stable isotope analysis technology and application
  • Surface water sulfur stable isotope analysis technology and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Surface water sulfur stable isotope analysis technology and application, including the following steps:

[0021] a. Filter and acidify the surface water sample to remove carbonate, then add barium chloride to generate 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 Finally, 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 1020 ° C, column oven 85 ° 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 ionizes t...

Embodiment 2

[0032] Surface water sulfur stable isotope analysis technology and application, including the following steps:

[0033] a. Filter and acidify the surface water sample to remove carbonate, then add barium chloride to generate 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 Finally, accurately weigh 1.0, 2.5, 4.0, 5.5, 7.0, 8.5, and 10.0 mg of precipitates, respectively, and put them into tin cups and wrap them.

[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 1020 ° C, column oven 85 ° C, the catalyst in the quartz tube in the oxidation furnace is 25 grams of tungsten oxide and granular 50 grams of p...

Embodiment 3

[0044] comparative test

[0045]

[0046] In summary, the method of the present invention has the characteristics of high precision, good repeatability, easy operation, high analysis efficiency, etc., and can be applied to the needs of sulfur isotope detection of surface water samples.

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Abstract

The invention discloses a method for detecting sulfur stable isotopes in a surface water sample in an SO+ mode, which comprises the following specific steps: filtering, acidifying, precipitating and evaporating the surface water sample to dryness, filling in a tin cup, wrapping, and detecting a sample to be detected by using an element analyzer-stable isotope mass spectrometer. According to the method, SO+ is generated by utilizing the secondary ionization effect of the ion source high-energy electron flow on SO2+, and the SO+ ion beam is separated and tuned by optimizing the voltage of the quadrupole, so that the sulfur isotope ratio of the surface water sample is efficiently and accurately analyzed, the result precision is high, the repeatability is good, and the operation is easy.

Description

[0001] The invention is supported by Tianjin Normal University Education Fund (043-135202WT1703). technical field [0002] The invention belongs to the technical field of stable isotope analysis, in particular to surface water sulfur stable isotope analysis technology and its application. Background technique [0003] The application of sulfur stable isotope analysis technology in environmental protection and agricultural production has received widespread attention. Many studies have reported the use of sulfur stable isotope to study the migration and transformation mechanism of sulfur in surface water 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, the sulfur element in the sample is oxidized to sulfur dioxide by the elemental analyzer, and then the sulfur dioxide (SO 2 ) into sulfur dioxide ions (SO 2 + ) for sulfur isotope ratio analys...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/62
CPCG01N27/62
Inventor 尚云涛马美红高健赵川张洪杰李玉琴
Owner TIANJIN NORMAL UNIVERSITY
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