CRM Ce, Dy, Er, Eu, Gd, Ho, La, Lu, Nd, Pr, Sc, Sm, Tb, Tm, Y, Yb - Aqueous calibration solution ASTASOL® AN9088MN

Aqueous Calibration Solution ASTASOL® AN9088MN: Certified Reference Material Summary

Significance of the Topic

This certified reference material (CRM) for lanthanide elements in aqueous solution addresses the critical need for reliable calibration standards in trace elemental analysis. Accurate quantification of rare earth elements is essential across environmental monitoring, materials science, pharmaceuticals, and quality control in industrial processes. CRMs with well-defined concentrations and traceability to SI units ensure consistency and comparability of results across laboratories and instrumental platforms.

Study Objectives and Overview

The certificate documents the preparation, characterization, and certification of ASTASOL® AN9088MN, an aqueous calibration solution containing 16 lanthanide elements at defined concentration levels. The objectives are:

• To provide gravimetrically prepared standard solutions with direct traceability to the kilogram.
• To verify certified values and uncertainties via primary and instrumental methods.
• To demonstrate homogeneity and stability over the specified shelf life.

Methodology and Instrumentation

The CRM was prepared by dissolving high-purity oxides and nitrates in 5 % HNO₃ matrix using sub-boiled reagents and ultrapure water. Gravimetric techniques ensured accurate mass fractions. Analytical characterization employed:

• Complexometric titration with EDTA for individual lanthanides using NIST SRM references.
• Atomic absorption spectrometry (AAS), atomic emission spectrometry (AES), inductively coupled plasma optical emission spectrometry (ICP-OES), and inductively coupled plasma mass spectrometry (ICP-MS) calibrated against independent SRMs.

Used Instrumentation

• AAS (flame and graphite furnace) for trace impurities.
• AES for selected lanthanides.
• ICP-OES for multi-element quantification.
• ICP-MS for ultra-trace impurity determination.

Key Results and Discussion

Certified concentrations at 20 °C were established:

• Ce, La, Nd, Pr: 100.0 ± 0.2 mg/L.
• Dy, Er, Eu, Gd, Ho, Lu, Sc, Sm, Tb, Tm, Y, Yb: 20.00 ± 0.04 mg/L.

Density was determined as 1.0276 ± 0.0005 g/cm³. Homogeneity tests confirmed uniform distribution across bottles. Stability studies demonstrated no significant drift over a three-year shelf life under recommended storage conditions. Trace impurities are reported below detection limits, ensuring minimal interference in calibration.

Benefits and Practical Applications

This CRM provides:

• Direct SI unit traceability via gravimetric preparation.
• Broad applicability for calibration and validation in atomic spectrometry and selected electroanalytical methods.
• Documented stability and homogeneity to support long-term use in quality assurance programs.

End users benefit from improved method accuracy, reduced inter-laboratory variability, and enhanced confidence in analytical data.

Future Trends and Applications

Advancements may include:

• Extension of CRM portfolios to emerging critical elements and isotopic standards.
• Integration of digital certification and blockchain-based traceability records.
• Green chemistry approaches to reduce acid usage and waste.
• Miniaturized and on-site calibration solutions for portable spectrometers.

Conclusion

ASTASOL® AN9088MN is a rigorously characterized aqueous CRM for lanthanides, offering precise, traceable concentrations and robust performance for analytical laboratories. Its certified values, low uncertainties, and comprehensive documentation support high-confidence calibrations across multiple spectrometric techniques.

References

• NIST SRM 928 Rare Earth Element Solution.
• NIST SRM 3110a Rare Earth Element Solution.
• NIST SRM 3123a Rare Earth Element Solution.
• NIST SRM 3127a Rare Earth Element Solution.
• NIST SRM 3148a Rare Earth Element Solution.
• NIST SRM 3157a Rare Earth Element Solution.
• NIST SRM 3167a Rare Earth Element Solution.