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Nd and Sm separation method applied to Nd isotopc analysis of thermal ionization mass spectrum

A separation method and isotope technology, applied in the field of chemical analysis, can solve the problems of time-consuming chemical separation process, increased risk of cross-contamination of samples, time-consuming multi-step separation, etc.

Inactive Publication Date: 2019-08-20
INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The traditional separation method of Sm and Nd is LN column extraction chromatography, which can realize the complete separation of Sm and Nd, but the separation effect of Ce, Pr and Nd, especially Pr and Nd is poor. For better separation of Pr and Nd, this method generally requires the use of thinner and longer columns, and the chemical separation process is very time-consuming. At the same time, in order to obtain a better separation effect of Pr and Nd, it is often necessary to sacrifice the recovery rate of Nd
Moreover, even if the long and thin exchange column is used and the recovery rate of Nd is sacrificed, the separation effect of Pr and Nd by the traditional LN column separation method is still not ideal, resulting in thermal ionization mass spectrometry of NdO + Serious PrO still existed during the determination + to NdO + interference issues, including 141 PR 17 o + interference 142 Nd 16 o + , 141 PR 18 o + interference 143 Nd 16 o +
In addition, due to the strict requirements on the purity of the elements to be measured by thermal ionization mass spectrometry, the traditional LN column chromatographic separation method for separating Sm and Nd generally needs to first use the cation exchange method to separate the rare earth elements from the sample matrix elements, and then use the LN column to separate the cations. The rare earth elements separated by the exchange column are separated from Sm and Nd. Multi-step separation is more time-consuming, and it will increase the background of the process and increase the risk of sample cross-contamination

Method used

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  • Nd and Sm separation method applied to Nd isotopc analysis of thermal ionization mass spectrum
  • Nd and Sm separation method applied to Nd isotopc analysis of thermal ionization mass spectrum
  • Nd and Sm separation method applied to Nd isotopc analysis of thermal ionization mass spectrum

Examples

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Effect test

Embodiment 1

[0057] BCR-2Sm-Nd Isotope Analysis of Basalt International Rock Standard Sample

[0058] (1) Dissolved sample: Weigh ~100 mg of BCR-2 basalt standard sample powder, put it into a polytetrafluoroethylene sample dissolver, add appropriate amount 149 Sm- 150 Nd isotope diluent (accurately weighed). Add 2 ml of 29 mol / L hydrofluoric acid, 1 ml of 14 mol / L nitric acid and 0.2 ml of 12 mol / L perchloric acid, place the sample on a heating plate at 150°C for 1 week, and then evaporate the sample to dryness at 120°C and heat up to Heat at 180°C until white smoke comes out to drive away HF. Then add 1 ml of concentrated nitric acid, place it on a 120°C electric heating plate and heat it in a sealed manner for more than 12 hours, then evaporate the sample to dryness at 120°C again; repeat this step of dissolving the sample with nitric acid once. Finally, add 5 mL of 3mol / LHNO 3 , and placed on a 120°C electric heating plate to heat overnight to dissolve the sample until the solution ...

Embodiment 2

[0073] Analysis of BHVO-2Sm-Nd isotope of basalt international rock standard sample

[0074]Embodiment 2 is roughly the same as Embodiment 1, except that the geological sample selected in this embodiment is BHVO-2, an international rock standard sample of basalt with higher CaO content than BCR-2. The determination results of Nd isotopes and Sm and Nd contents of BHVO-2 with different loading amounts are shown in Table 4.

Embodiment 3

[0076] Analysis of Sm-Nd isotope of basalt international rock standard sample BIR-1a

[0077] Embodiment 3 is roughly the same as Embodiment 1, except that the geological sample selected in this embodiment is the basalt international rock standard sample BIR-1a with lower Sm and Nd contents. The determination results of Nd isotopes and Sm and Nd contents of BIR-1a with different loading amounts are shown in Table 5.

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Abstract

The invention discloses a Nd and Sm separation method applied to Nd isotopc analysis of a thermal ionization mass spectrum. The method comprises the following steps of sample dissolving, in which a sample is dissolved to obtain a 3mol / L of HNO3 medium sample solution; and chemical separation, in which the sample solution is loaded onto an exchange column which is filled with 1.0ml of TODGA levextrel resin, 10ml 3mol / L of HNO3 is used to wash out basic elements including Fe, Mg, Al, K, Na, Cr, Ti and Ba, 10mL 11mol / L HNO3 is used to wash out Ca, 15ml 2.5mol / L HCl is used to wash out interference elements including La, Ce and Pr, 6mL 2mol / L of HCl is used to analyze Nd, and 5mL 0.5mol / L HCl is used to analyze Sm. According to the method, neodymium and samarium can be separated from a geologic sample by one column, Nd and Sm obtained by separation are high in purity and recovery rate, the method is rapid and efficient, and the flow background is low.

Description

technical field [0001] The invention belongs to the technical field of chemical analysis, and in particular relates to an Nd and Sm separation method applied to thermal ionization mass spectrometry Nd isotope analysis. Background technique [0002] The Sm-Nd isotope system has extremely important application value in the research fields of isotope geochemistry and isotope geochronology, including tracing the source of magma, growth age of continental crust, crust-mantle interaction, garnet Sm-Nd dating, paleoenvironment and global change Nd isotope tracing et al. With the deepening of applied research, isotope geochemical research has higher and higher requirements for Sm-Nd isotope analysis technology. For example, samples such as garnet, highly depleted ultramafic rocks or their single minerals, extraterrestrial samples, foraminifers, corals, etc., or samples with very low Sm and Nd contents (such as garnet, highly depleted ultramafic rocks and their single minerals, cor...

Claims

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Application Information

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IPC IPC(8): G01N27/62G01N27/626
CPCG01N27/626
Inventor 储著银王梦杰李潮峰许俊杰王伟郭敬辉
Owner INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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