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Analysis method for magnesium isotope composition

An analytical method and technology of magnesium isotopes, applied in the direction of analytical materials, material separation, instruments, etc., to achieve the effect of shortening the column passing process, long operation time and high recovery rate

Pending Publication Date: 2022-04-08
CHINA UNIV OF GEOSCIENCES (BEIJING) +1
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, the current existing methods cannot easily and efficiently realize the separation of magnesium in low-magnesium samples.

Method used

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  • Analysis method for magnesium isotope composition
  • Analysis method for magnesium isotope composition
  • Analysis method for magnesium isotope composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] 1) Weigh 20 mg of sample (see Table 1 for types), add 2 mL of HNO 3 , 1mL of HF and 0.5mL of HClO 4 , heated on an electric heating plate at 130°C and kept for 36 hours; the digestion solution was cooled to 95°C and evaporated to dryness, and added HCl-HNO with a volume ratio of 3:1 3 , heated on an electric heating plate at 120°C, kept for 36 hours, cooled to 95°C, evaporated to dryness, and added 0.5ml concentrated HNO 3 After reconstitution and evaporation to dryness, 200 microliters of 1.5M HNO 3 +0.1HF for reconstitution.

[0072] 2) Fill 2.3mL of AG50W-X12 cation exchange resin (200-400 mesh) into a resin tube made of PP (inner diameter: 4mm, height: 20cm) to obtain a cation exchange chromatography column. Rinse the cation exchange column with 10mL 6N HCl and 10mL pure water successively; 3 +0.1N HF to activate the chromatographic column; add 0.1mL sample dropwise to the chromatographic column; use 17mL 1.5N HNO 3 +0.1NHF to wash the chromatographic column se...

Embodiment 2

[0077] The isotopic composition of magnesium in plant samples was analyzed.

[0078] 1) Use a high-pressure digestion tank for digestion, add 20 mg of plant samples into the high-pressure digestion tank, heat the digestion tank to 180 °C, keep it for 36 hours, and add 2 mL of H 2 o 2 Remove organic matter, keep at 70°C for 4 hours, evaporate the digestion solution to dryness, and use HNO 3 Reconstitute, evaporate to dryness at 95°C, and finally use 200 μl of 1.5M HNO 3 +0.1HF for reconstitution.

[0079] 2) Sample purification and separation methods are the same as in Example 1.

[0080] 3) The content of Mg in the purified and separated plant samples was tested by inductively coupled plasma mass spectrometry (ICP-MS), and the recovery rate was 101.0%±1.2%. δ 26 Mg detection result, detection condition is identical with embodiment 1, and result is as shown in table 2.

[0081] Table 2 Test δ of different plant samples 26 Mg analysis results

[0082] sample Mg...

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Abstract

The invention provides an analysis method for magnesium isotope composition, and belongs to the field of geochemistry. Comprising the following steps: digesting a sample to be detected to obtain a digested substance; the digested substance is mixed with mixed acid, a digested sample solution is obtained, and the mixed acid comprises nitric acid and hydrofluoric acid; carrying out cation exchange chromatographic column separation and purification on the digested sample solution to obtain an Mg isotope solution sample; and carrying out multi-receiving plasma mass spectrometry detection on the Mg isotope solution sample to obtain an Mg isotope distribution ratio, and calculating according to a formula 1 to obtain the Mg isotope composition. The method is applicable to separation of magnesium elements in samples with different magnesium contents, and separation of magnesium elements in low-magnesium samples can be completed simply, conveniently and efficiently; the recovery rate of the Mg element in various standard samples is close to 100%, the recovery rate is high, and the Mg isotope composition in the samples with different magnesium contents can be accurately measured.

Description

technical field [0001] The invention relates to the technical field of geochemistry, in particular to an analysis method for magnesium isotope composition. Background technique [0002] With the improvement of instruments and analytical methods, isotope analysis technology has been more maturely applied in the field of earth and space science. Magnesium (Mg) is an important constituent element of the silicate earth, which is widely distributed in the mantle and crust. Magnesium is active and can react with most acids, bases, and non-metallic substances, and migrate and transform in different environments, thus widely participating in chemical and biogeochemical processes. Mg has 3 stable isotopes 24 Mg, 25 Mg, 26 Mg, of which 24 The relative abundance of Mg reaches up to 78.992%, 25 Mg and 26 The relative abundances of Mg are 10.003% and 11.005%, respectively. The large relative mass difference between magnesium isotopes leads to large fractionation of magnesium isot...

Claims

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Application Information

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IPC IPC(8): G01N30/06G01N30/72G01N30/96
Inventor 韩贵琳刘金科屈睿张倩
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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