Articles | Volume 18, issue 22
https://doi.org/10.5194/amt-18-7021-2025
https://doi.org/10.5194/amt-18-7021-2025
Research article
 | 
25 Nov 2025
Research article |  | 25 Nov 2025

Xact625i vs. PX-375: a comparative study of online XRF ambient multi-metal monitors vs. ICP-MS

Laurence C. Windell, Saliou Mbengue, Petra Pokorná, Jaroslav Schwarz, André S. H. Prévôt, Manousos I. Manousakas, Stefanos Papagiannis, Jakub Ondráček, Roman Prokeš, and Vladimir Ždímal

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Short summary
In this work, we compare the two most widely used online XRF monitors for ambient elemental analysis, the Xact625i and PX-375. We found strong correlations between the online instruments and the reference method (better so for the Xact625i), while in terms of absolute concentrations, some elements were over- and underestimated. Overall, we determined both instruments can be used as powerful tools to produce high-time resolution elemental data for use in air quality monitoring.
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