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A Method for Simultaneous Mass Spectrometry Measurement of Sm-Nd Isotope in Geological Samples Without Diluent

A technology for geological samples and neodymium isotopes, which is used in measurement devices, material analysis by electromagnetic means, instruments, etc., can solve the problems of living environment risks, difficulty in achieving isotope balance, environmental pollution, etc.

Inactive Publication Date: 2020-07-10
INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These harsh prerequisites also make it inevitable to add too much or too little diluent in actual use. Sometimes, it is difficult to achieve the isotope balance between different types of geological samples and diluents.
In addition, this technology also has potential environmental pollution risks. At present, after the samarium-neodymium isotope diluent is used, there is no direct discharge of any recycling. Since the diluent is artificially manufactured and concentrated, its isotope composition is completely different from natural substances. Therefore, long-term The direct emission may change the isotopic composition of the local area, and undoubtedly brings potential risks to people's living environment

Method used

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  • A Method for Simultaneous Mass Spectrometry Measurement of Sm-Nd Isotope in Geological Samples Without Diluent
  • A Method for Simultaneous Mass Spectrometry Measurement of Sm-Nd Isotope in Geological Samples Without Diluent

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Experimental program
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Effect test

Embodiment 1

[0071] (1) Dissolving samples: Weigh 40-50 mg of basalt (BCR-2) rock powder into a PFA sample dissolver, add 3 ml of 29M hydrofluoric acid, 0.3 ml of 14M nitric acid and 0.1 ml of 12M perchloric acid, and seal the dissolver. The samples were placed on a heating plate at 190°C for 5 days. Then open the sample dissolver and evaporate the sample to dryness, add 2 ml of 6M nitric acid and place it on a heating plate at 100°C for 12 hours, then evaporate the sample to dryness at 150°C, and emit white smoke at 200°C. Finally, 3.0 ml of saturated boric acid was added, and placed on a 100° C. electric heating plate to keep warm overnight. After cooling, it was ready to be separated by column. All the above operations are carried out in a class 100 fume hood and a class 100 clean bench in a class 1000 clean room to obtain low background values ​​of samarium and neodymium.

[0072] (2) Chemical separation: transfer the dissolved sample solution to the pretreated TODGA resin, and separa...

Embodiment 2

[0084] Embodiment 2 is roughly the same as Embodiment 1, except that the geological sample selected in this embodiment is AGV-2 (andesite), the sample weight is ~ 50 mg, and the detection results of samarium-neodymium isotopes are shown in Table 3 respectively.

Embodiment 3

[0086] Embodiment 3 is roughly the same as Embodiment 1, except that the geological sample selected in this embodiment is W-2 (diabase), the sample weight is ~ 100 mg, and the detection results of samarium-neodymium isotopes are shown in Table 3 respectively.

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Abstract

The invention provides a method for simultaneous mass spectrometry testing of samarium-neodymium isotopes of geological samples without a diluent, comprising: a sample dissolving step: completely dissolving the geological sample with an inorganic solvent to obtain a sample solution and evaporating to dryness; adding an appropriate amount of high-purity concentrated nitric acid and evaporating to dryness Then add an appropriate amount of saturated boric acid and evaporate to dryness, then add an appropriate amount of high-purity nitric acid to obtain a sample lysate; chemical separation step: the sample lysate is passed through an ion exchange column loaded with an extraction resin to make the sample The samarium and neodymium in the dissolved matter are all separated; wherein the ion exchange column is filled with 1 ml of the extraction resin, and the extraction resin is an inert resin polymer carrier carrying N,N,N'N'-four A solution formed by dissolving (1-octyl)-3-oxopentane-1,5-diamine in a liquid organic solvent; mass spectrometry test steps: using a multi-receiving inductively coupled plasma mass spectrometer to perform mass spectrometry tests on the separated samarium and neodymium , in order to obtain the samarium-neodymium isotope test results at the same time.

Description

technical field [0001] The disclosure relates to the technical field of isotope geochemistry, in particular to a method for simultaneous mass spectrometry testing of samarium-neodymium isotopes of geological samples without diluents. Background technique [0002] As the most widely used tracing or dating method in solid earth science, samarium-neodymium isotopes have always attracted extensive attention from earth scientists. However, the variation range of the samarium-neodymium isotope ratio in different geochemical reservoirs is very small. Therefore, the basis for the application of the samarium-neodymium isotope method is a high-precision isotope measurement technology, especially the measurement accuracy of the samarium-neodymium isotope ratio. More stringent (<0.003%, 2RSE). [0003] At present, thermal ionization mass spectrometry (TIMS) has the advantages of high accuracy, high sensitivity, high efficiency and weak memory effect. It is considered as the benchmar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/62G01N27/626
CPCG01N27/62
Inventor 杨岳衡
Owner INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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