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Method for detecting sulfur stable isotope of wetland plants in sulfur monoxide mode

A stable isotope and wetland plant technology, applied in the field of stable isotope analysis, can solve problems such as difficult to focus receivers and affect detection results, and achieve good reproducibility, improved accuracy and reproducibility, and high accuracy

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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 isotope of wetland plants in sulfur monoxide mode
  • Method for detecting sulfur stable isotope of wetland plants in sulfur monoxide mode
  • Method for detecting sulfur stable isotope of wetland plants in sulfur monoxide mode

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A method for detecting stable isotopes of sulfur in wetland plants in a sulfur monoxide mode, comprising the following steps:

[0021] a. After drying, grinding, and filtering the wetland plant samples, accurately weigh 5.0 mg of the sample and put it 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 temperature 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 the sample to generate SO + The parameters of the ion source of the stable isotope mass spectrometer are: the core voltage of the ion source is 6.0KV, the half-plate v...

Embodiment 2

[0032] A method for detecting stable isotopes of sulfur in wetland plants in a sulfur monoxide mode, comprising the following steps:

[0033] a. After drying, grinding and filtering the wetland plant samples, accurately weigh 1.0, 2.5, 4.0, 5.5, 7.0, 8.5 and 10.0 mg samples respectively, 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 pure copper.

[0036] d. The high-energy ion source ionizes the sample to generate SO + The parameters of the ion source of the stable isotope mass spectrometer are: the core voltage of the ion sourc...

Embodiment 3

[0044] comparative test

[0045]

[0046] In summary, the method of the present invention has the advantages of good repeatability, high efficiency, and high accuracy, and can meet the needs of improving the detection ability of sulfur isotopes in wetland plant samples.

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Abstract

The invention discloses a method for detecting a sulfur stable isotope in a wetland plant sample in an SO+ mode, which comprises the following specific steps: drying, grinding and filtering the wetland plant sample by a screen, filling a tin cup with the wetland plant sample, wrapping, and detecting a sample to be detected by using an element analyzer-stable isotope mass spectrometer. Ion source parameters are optimized, secondary ionization of high-energy electron flow on SO2+ is achieved by tuning ion source core voltage and half-plate voltage, SO+ is generated for sulfur isotope detection, rapid and accurate detection of the sulfur isotope ratio of wetland plant samples is further achieved, and the method is high in result accuracy, good in reproducibility and high in efficiency.

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, and in particular relates to a method for detecting stable sulfur isotopes of wetland plants in a sulfur monoxide mode. Background technique [0003] With the continuous progress and development of sulfur stable isotope analysis technology, its application in environmental protection and agricultural production is becoming more and more mature. There have been related research reports on the use of sulfur stable isotopes to study the transformation mechanism and bioavailability of sulfur sources in wetland plants. [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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/62
CPCG01N27/62
Inventor 高健尚云涛王义东赵川陈健全李玉琴
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