Would you accept results from an assay laboratory that doesn’t use standards, duplicates, or blanks? Your answer should be an empathetic no! You should treat your pXRF analysis the same way otherwise; with no standard Certified Reference Materials (CRM) to compare to, it is just a random number generator.
For users of portable X-ray fluorescence (pXRF) instruments, routine analysis of CRMs can provide a baseline performance of the instrument and monitor the quality of your results during the sampling program. This allows the user to quantify the accuracy and precision of the results and check whether post-processing is necessary.
Firstly, manufacturers calibrate instruments to give an approximate result across the entire matrix types; they are unlikely to give you an exact result for your particular geologic environment.
As well, CRMs are certified using a different assay method to the portable XRF method, so they should only be used as a guide. If aqua regia is used in the certification of the CRM, then this will differ from the pXRF result as it only provides the total soluble analysis. Fusion XRF and ICP-MS correlate better with pXRF but again may not be suitable for all elements.
Portable Spectral Services sell a variety of CRMs in pXRF cups that cover a wide variety of matrices, elements and element concentrations.
Custom calibrations developed for a specific geologic environment can give increased accuracy and precision than a manufacturer calibration. A custom calibration can be created by obtaining CRMs suitable for your environment and/or creating CRMs using your laboratory assay results. Portable Spectral Services is a certified Bruker custom calibration provider and can develop a calibration specific to your geologic environment.
By keeping these points in mind you can be sure that your pXRF is fit for purpose and gain confidence in the results.
Findings of an ongoing regional evaluation study over concealed Proterozoic lithologies known to host magmatic nickel sulphides with potential to host other base-metal, gold and rare earth elements (“REE”) systems within the Fraser Range, Western Australia.
Demand for Rare Earth Elements (REE) continues to increase as the globe migrates to renewable energy. Exploration for REE have significantly increased over the last
A custom calibration looks holistically at the material of each sample and how the elements interact with each other. Custom calibrations are created using proprietary
Automated mineralogy is a field that has seen significant growth and development in recent years. At its core, automated mineralogy involves the use of specialized
One of the most beloved Christmas desserts has long been the Christmas pudding. A dense, brandy and fruit-laden cake, whose origins date back to 14th
This presentation has been adapted for online reading and learning. It was originally presented at the Histories of Metallurgy and Metal Material Culture symposium at
Portable Spectral Services’ Schedule of Hire, Support Services & Fees is now available!
