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Method for detecting sulfur stable isotopes in landscape riverway water samples

A stable isotope and detection method technology, applied in the direction of measuring devices, material analysis through electromagnetic means, instruments, etc., can solve problems such as difficult to focus receivers and affect detection results, achieve good reproducibility, improve accuracy and repeatability Reproducibility and high accuracy

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 detecting sulfur stable isotopes in landscape riverway water samples
  • Method for detecting sulfur stable isotopes in landscape riverway water samples
  • Method for detecting sulfur stable isotopes in landscape riverway water samples

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Sulfur stable isotope detection method in landscape river water sample, comprises the following steps:

[0021] a. Filter and acidify the landscape river water samples to remove carbonates, then add barium chloride to form barium sulfate precipitates to fix sulfate radicals, filter again to collect barium sulfate precipitates, and evaporate the precipitates at 50°C After drying, accurately weigh 5.0 mg of the precipitate into a tin cup and wrap.

[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 tube 1020 ° C, column oven 80 ° 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 the sample t...

Embodiment 2

[0032] Sulfur stable isotope detection method in landscape river water sample, comprises the following steps:

[0033] a. Filter and acidify the landscape river water samples to remove carbonates, then add barium chloride to form barium sulfate precipitates to fix sulfate radicals, filter again to collect barium sulfate precipitates, and evaporate the precipitates at 50°C After drying, accurately weigh 1.0, 2.5, 4.0, 5.5, 7.0, 8.5, and 10.0 mg of the precipitate, 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 tube 1020 ° C, column oven 80 ° C, the catalyst in the quartz tube in the oxidation furnace is 25 grams of tungsten oxide and granular 50 grams of pure c...

Embodiment 3

[0044] comparative test

[0045]

[0046] In summary, the method of the present invention has the advantages of reproducibility, high efficiency, accuracy, easy operation and high equipment maintenance, and can effectively improve the shortcomings of the current sulfur isotope detection technology for landscape river water samples.

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Abstract

The invention discloses a method for detecting sulfur stable isotopes in a landscape riverway water sample in an SO+ mode, which comprises the following specific steps: filtering, acidifying, precipitating and evaporating the landscape riverway water sample to dryness, filling a tin cup with the dried landscape riverway water sample, wrapping, and detecting a sample to be detected by using an element analyzer-stable isotope mass spectrometer. According to the method, ion source parameters are optimized, secondary ionization of high-energy electron flow on SO2+ is realized by tuning filament voltage to generate SO+, and the generated SO+ is effectively separated by tuning quadrupole voltage, so that the accuracy and efficiency of the sulfur isotope ratio of the landscape river water sample are improved, the result precision is high, the reproducibility is good, and the operation and equipment maintenance are 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 a method for detecting sulfur stable isotope in landscape river water samples. Background technique [0003] The current sulfur stable isotope analysis technology is developing rapidly, and it has been widely used in related fields such as environmental protection and agricultural production. Research reports have shown that sulfur stable isotope technology has played an important role in the migration and transformation mechanism of sulfur in water bodies 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/62
CPCG01N27/62
Inventor 高健李煜王淑芳焦新颖尚云涛高美丽
Owner TIANJIN NORMAL UNIVERSITY
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