Overview

EN ISO 24181-1:2025 (adopted from ISO 24181-1:2024) specifies a standardized ICP‑AES (inductively coupled plasma atomic emission spectroscopy) method for determination of non‑rare earth impurities in individual rare earth metals and their oxides. Part 1 addresses the analysis of Al, Ca, Mg, Fe and Si. The document defines measurement ranges, sample preparation, calibration, measurement and result calculation procedures aimed at improving consistency of impurity analysis across laboratories and supply chains.

Key topics and requirements

Analytes covered: Aluminum (Al), Calcium (Ca), Magnesium (Mg), Iron (Fe) and Silicon (Si).
Analytical technique: Inductively coupled plasma atomic emission spectroscopy (ICP‑AES / ICP‑OES).
Measurement ranges (mass fraction %):
- Mg, Al, Si, Ca: 0.001 to 0.2 %
- Fe: 0.001 to 0.5 %
Procedure elements:
- Weighing of test portions and defined sample preparation steps.
- Preparation of calibration solutions and instrument setup (line selection, calibration curve construction).
- Measurement protocol for calibration and test solutions, and calculation/expression of results.
Quality and performance: Precision and verified measurement ranges are supported by interlaboratory test results and statistical analysis (informative annexes).
Safety and compliance: Users are warned to follow appropriate laboratory safety practices and relevant regulatory limits.

Practical applications and users

This standard is designed for organizations that need reliable, comparable impurity data for rare earth materials:

Producers and refiners of rare earth metals and oxides (quality control, batch release).
Analytical laboratories performing routine or accredited testing of rare earth materials.
Manufacturers of magnets, alloys, electronics and other products that depend on rare earth feedstock quality.
Buyers, traders and certification bodies requiring consistent impurity reporting for procurement and specifications.
Research and development groups working on materials processing, recycling and material characterization.

Practical benefits include harmonized test methods, reduced interlaboratory variability, defensible impurity data for specifications, and support for supply‑chain quality assurance.

Related standards

Relevant normative references cited within EN ISO 24181-1:

ISO 11885 (ICP‑OES methods for selected elements)
ISO 22444‑1 / 22444‑2 (rare earth vocabulary)
Laboratory glassware and water quality standards: ISO 648, ISO 1042, ISO 3696

Keywords: EN ISO 24181-1:2025, rare earth, non-rare earth impurities, ICP-AES, aluminum, calcium, magnesium, iron, silicon, rare earth metals, oxides, measurement range, interlaboratory.

Overview

Key topics and requirements

Analytes covered: Aluminum (Al), Calcium (Ca), Magnesium (Mg), Iron (Fe) and Silicon (Si).
Analytical technique: Inductively coupled plasma atomic emission spectroscopy (ICP‑AES / ICP‑OES).
Measurement ranges (mass fraction %):
- Mg, Al, Si, Ca: 0.001 to 0.2 %
- Fe: 0.001 to 0.5 %
Procedure elements:
- Weighing of test portions and defined sample preparation steps.
- Preparation of calibration solutions and instrument setup (line selection, calibration curve construction).
- Measurement protocol for calibration and test solutions, and calculation/expression of results.
Quality and performance: Precision and verified measurement ranges are supported by interlaboratory test results and statistical analysis (informative annexes).
Safety and compliance: Users are warned to follow appropriate laboratory safety practices and relevant regulatory limits.

Practical applications and users

This standard is designed for organizations that need reliable, comparable impurity data for rare earth materials:

Producers and refiners of rare earth metals and oxides (quality control, batch release).
Analytical laboratories performing routine or accredited testing of rare earth materials.
Manufacturers of magnets, alloys, electronics and other products that depend on rare earth feedstock quality.
Buyers, traders and certification bodies requiring consistent impurity reporting for procurement and specifications.
Research and development groups working on materials processing, recycling and material characterization.

Practical benefits include harmonized test methods, reduced interlaboratory variability, defensible impurity data for specifications, and support for supply‑chain quality assurance.

Related standards

Relevant normative references cited within EN ISO 24181-1:

ISO 11885 (ICP‑OES methods for selected elements)
ISO 22444‑1 / 22444‑2 (rare earth vocabulary)
Laboratory glassware and water quality standards: ISO 648, ISO 1042, ISO 3696

Keywords: EN ISO 24181-1:2025, rare earth, non-rare earth impurities, ICP-AES, aluminum, calcium, magnesium, iron, silicon, rare earth metals, oxides, measurement range, interlaboratory.

EN ISO 24181-1:2025 PDF

Technical details

Abstract

Overview

Key topics and requirements

Practical applications and users

Related standards

Related standards

Abstract

Overview

Key topics and requirements

Practical applications and users

Related standards

Related standards

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