The success of an XRF analysis depends on the quality of the calibration standards used. Finding high quality standards in the required analytical range is not only challenging but in most cases also expensive. Synthetic standards are a powerful option, yet the development of these requires dedicated expertise and skills.

For this reason, Malvern Panalytical has developed WROXI, a calibration module designed specifically for analysis of a wide range of oxide materials. They are delivered together with an application setup template for the Zetium spectrometer. The standards enable calibrations for 21 major elements in the analysis of oxide materials based on fused beads. These cover a wide range of geological material compositions. The WROXI standards set is suited for a wide variety of materials, including: silicates, carbonates, phosphates, rocks, soils, iron ores, manganese ores and cements.

Primary and/or validation calibration 

WROXI can be used either as a primary fused bead calibration or to verify in-house standards for pressed powder applications (using fusion). Since the use of CRM’s are limited to material available and are expensive, synthetic standards such as WROXI offer concentrations and analytical ranges that are tailored while remaining cost effective. The WROXI calibration has been validated with over 115 CRM’s and shows excellent agreement. 

Which materials can be analyzed? 

  • Limestone
  • Iron/manganese ore
  • Bauxite
  • Clay/shales
  • Rocks
  • Phosphates
  • Feldspar
  • Blast furnace slags
  • Fly ash
  • Gypsum
  • Soils

Why Fusion? 

The standards are fused to remove mineralogical and particle size effects. Fused samples are ‘perfect’ samples, and in combination with the Fundamental Parameters (FP) matrix correction model enable very wide concentration ranges in a single calibration. Fusion is ideal for accurate analysis of light element as these are typically most affected by particle size and mineralogical effects.

The WROXI calibration module set is comprised of 20 synthetic multiple oxides standards supplied as powders. The standards are to be prepared as fused beads, using recipes provided and pre-programmed on you Malvern Panalytical fusion system or using your own fusion program. Standards are made from pure chemicals, are pre-conditioned, weighed, ground and ignited at 1050 °C before packaging. They are supplied as 10g powders packaged under nitrogen in plastic bottles. 

The WROXI module comprises of:  

• 20 multi element synthetic cement standards and a drift monitor sample

• Detailed instructions on the use and handling of the WROXI standards

• Calibration templates for SuperQ

• Suitcase for safe storage

Elements and analytical ranges

The WROXI calibration module includes 21 elements with a wide concentration range covering many materials. The elements and analytical ranges are shown in the table:


Concentration range (wt%)


Concentration range (wt%)


0 - 58


0 - 80


0 - 78


0 - 81


0 - 78


0 -12


0 - 80


0 - 8


0 - 40


0 - 10


0 - 59


0 - 20


0 - 40


0 - 43


0 - 80


0 - 43


0 - 40


0 - 10


0 - 10


0 - 10


0 - 10



The WROXI module and setup samples are designed to be used in combination with Malvern Panalytical WD XRF instruments like Zetium. Certain hardware requirements apply. The module can be delivered with new systems but can also be deployed on existing instruments running SuperQ software

Need to replenish your WROXI standards? A replenishment set is available, containing only the calibration standards.

Are your elemental and concentration ranges are not fully covered by WROXI? We can easily extend WROXI for you or provide a suite of synthetic standards fully tailored to your materials and analytical requirements. Refer to the XRF Calibration Sample Service under the Services section on our website for more details.