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Development of Dy, Ho, Er, Tm, and Sc mono-element standard solution certified reference materials (GBW08680-08684)

  • Liuxing FengEmail author
  • Bing Wu
  • Hongmei Li
  • Naijie Shi
Research Paper

Abstract

Dy, Ho, Er, Tm, and Sc mono-element solution certified reference materials (CRMs) with the certified value of 983.3 μg g−1 were developed with high-purity lanthanide oxides by using a novel purity characterization strategy. In the purity characterization process, complexometric titration was first employed to acquire the total metal ion concentration reacting with EDTA. Twenty-seven non-lanthanide impurities were measured by an external ICP-MS method with three multi-element calibration solution CRMs as calibrants. To avoid REO(H)+ interference from the main lanthanide matrix, two strategies namely LA-ICP-MS and MD-ICP-MS were optimized and used for the measurement of 15 rare earth impurities. The purity of lanthanide oxide material was obtained by subtracting the 42 impurities from the total metal ions reacting with EDTA. After purity characterization, the solution CRMs were prepared with a gravimetric method, and the CRM values were verified with corresponding NIST rare earth solution SRMs. It was shown that 15 units with duplicate analysis are enough to demonstrate the homogeneity of these candidate reference materials. The statistical results also showed no significant trends in stability tests for 24 months. The final uncertainties of the CRMs were evaluated by combining uncertainty contributions including the sample characterization and gravimetric preparation (uchar), between-bottle homogeneity (ubb), and stability (us). The relative expanded uncertainties of the five CRMs are 0.5%. These CRMs are primarily intended for use in the measurement and calibration procedures of lanthanide analysis in environmental and geological areas. Most importantly, the purity characterization strategy of this study will provide a new idea for the certification of high-purity and mono-element solution reference materials.

Keywords

Mono-element standard solution Certified reference material Lanthanide Purity characterization 

Notes

Funding information

The authors received financial support from “National Key Research and Development Program” (No. 2017YFF0205402) and “National Natural Science Foundation” (No. 11475163).

Compliance with ethical standards

This article does not contain any studies with humans or animals performed by any of the authors.

Conflict of interest

The authors declare that they have no conflict of interest.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Division of Metrology in ChemistryNational Institute of MetrologyBeijingChina

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