20.500.12556/DiRROS-27241 Direct method for Ra-226 analysis in water samples using ICP-QQQMS The paper describes a method of determination of Ra-226 in natural water using ICP-QQQ-MS, Agilent 8900, that enables an efficient direct determination of Ra-226 with high sensitivity without using any reaction gas and separation procedures for interference removal. The matrix effect, together with the instability of the sensitivity are controlled by spiking the sample with Ra-226. The method is simple and fast with a detection limit around of 0.1 fg g-1 (3.6 mBq kg-1), which is tenfold lower than required by the EU Directive for water consumption (40 mBq kg-1) and five times better than results obtained from alternative direct method for routine analysis described in the literature. The method can easily be implemented for routine analysis Ra-226 which was demonstrated by direct determination of Ra-226 in IAEA proficiency test water sample. This is the first time that the accuracy (trueness and precision) of a mass spectrometry method for the direct determination of Ra-226 has been tested and confirmed in an independent proficiency test. standard addition true false true Nature Publishing Group Združeno kraljestvo Angleški jezik Ni določen © The Author(s) 2026 Neznano 2026-01-30 09:32:56 2026-01-30 09:32:57 2026-02-02 03:54:06 0000-00-00 00:00:00 2026 0 0 Nasl. z nasl. zaslona; Opis vira z dne 29. 1. 2026; str. 1-10 Vol. 16, article no. 3068 2026 0000-00-00 Zaloznikova Objavljeno NiDoloceno 2025-05-14 2025-09-03 2026-01-23 543 2045-2322 10.1038/s41598-025-18775-4 266588931 https://www.nature.com/articles/s41598-025-18775-4 1 49adb47e-fdb6-11f0-a15d-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=39728 RAZ_Coha_Ivana_2026.pdf RAZ_Coha_Ivana_2026.pdf 1 BC93D971EAAB4AD462EB035E3D6144B9 bbfeee272a30379bd85af58f39dd3d89ecfa8360e5aed758043b19eb2255b1d8 d0c35d92-fdb6-11f0-a15d-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=39729 Institut Jožef Stefan 0 0 0