WROXI-REE calibration standards

Synthetic oxide setup standards for accurate rare-earth element analysis with XRF

WROXI-REE calibration standards

The wide-range oxide-rare-earth elements (WROXI REE) suite extends the proven WROXI platform into the analysis of rare earth elements (REEs), providing a robust calibration solution for X-ray fluorescence (XRF) across ores and concentrates.

REE analysis is inherently complex due to REE ores’ variable mineralogy and wide concentration ranges, as well as the limited availability of suitable reference materials. WROXI REE overcomes these challenges with synthetic, oxide-based setup standards that deliver consistent quality, optimized performance, and long-term availability.

As part of Malvern Panalytical’s REE Turnkey Solution, it enables accurate, defensible results with reduced method development effort.

Designed for REE complexity

Rare-earth elements are economically valuable but challenging to process, as they typically occur in low concentrations in ores and require high-intensity processing to separate. To seize opportunities while ensuring economic extraction, REE producers need high-precision analysis. 

WROXI REE is specifically designed to enable this. It:

  • Covers the full workflow from low-grade ores (<10% REO) to high-grade concentrates (>60%)
  • Includes both REEs and key matrix elements
  • Supports a single calibration strategy across multiple material types

So you can get consistent analysis from exploration to production.

Advantages of synthetic WROXI REE standards

Unlike conventional certified reference materials (CRMs) derived from natural materials, WROXI REE standards are engineered from high-purity oxides, ensuring superior control and reproducibility.

This synthetic design provides clear advantages:

  • Homogeneous, traceable compositions
  • Line-overlap optimized materials for improved XRF accuracy
  • Flexible, application-specific calibration design
  • Reliable supply with no risk of depletion.

The result is a calibration approach that is robust today and future-proof tomorrow.

Comprehensive element coverage

WROXI REE enables realistic, multi-element calibration for REE-bearing materials. You get:

  • Coverage of all 17 rare earth elements
  • Up to 40 elements included in one calibration
  • Measurement ranges from trace (~0.01%) to major concentrations

In addition to REEs, key matrix and impurity elements (e.g. Fe, Si, Ca, Th, U) are incorporated to ensure accurate correction of real sample compositions.

Optimized for XRF performance

WROXI REE is purpose-built to simplify calibration and enhance analytical reliability for wavelength-dispersive X-ray fluorescence (WDXRF) on instruments such as our Zetium spectrometer.

Key advantages:

  • Reduced spectral interferences through engineered compositions
  • Fewer standards required, lowering calibration complexity
  • Improved matrix and line-overlap corrections
  • Consistent performance across different sample types

This results in faster setup and more stable routine operation.

Part of the REE Turnkey Solution

WROXI REE is fully integrated into Malvern Panalytical’s REE Turnkey Solution, combining standards, fusion, and XRF methods into one validated workflow.

The solution includes:

  • Calibration standards (WROXI REE)
    Synthetic, optimized standards enabling simplified and robust calibration

  • Fusion sample preparation
    Optimized recipes for REE matrices
    Typical fusion time: 20–25 minutes

  • XRF method for Zetium
    One method across ores and concentrates
    Measurement of ~40 elements in ~45 minutes
    Includes drift and matrix corrections

Together, this approach minimizes setup time and ensures consistent, validated analytical performance.

Quality you can trust

WROXI REE standards are produced in Malvern Panalytical’s Nottingham, United Kingdom facility in accordance with the following internationally recognized standards:

  • ISO 17034-accredited CRM production
  • Analytical capabilities aligned with ISO 17025

This ensures results are traceable, reproducible, and audit-ready.

Benefits

WROXI REE delivers value across analytical, operational, and business levels:

Analytical
  • High accuracy across complex matrices
  • Reduced matrix effects with oxide-based standards
  • Reliable, defensible data
Operational
  • Faster implementation with minimal method development
  • Simplified workflows and fewer standards
  • One method for multiple materials
Business
  • Improved process control and recovery
  • Better product valuation through accurate analysis
  • Lower total cost of ownership

Why choose WROXI REE?

WROXI REE combines the strength of the WROXI concept with a purpose-built REE calibration strategy. It provides a complete, future-ready solution for laboratories facing increasing demand for accurate rare earth analysis.

It delivers:

  • Complete REE and multi-element coverage
  • Synthetic, consistent, and reliable standards
  • Optimized XRF calibration performance
  • Integration into a fully validated workflow

Get in touch

Contact Malvern Panalytical to learn how WROXI REE can support your REE analysis using the Zetium, or visit MyStore to explore our existing range of WROXI Standards.

Get in touch