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. 2024 Jan 30;416(11):2849–2858. doi: 10.1007/s00216-024-05149-4

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© The Author(s) 2024

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 6 — Chromatograms of the monitored m/z from Mo, Ru, and Tc for the developed separation of [⁹⁹Tc]Tc $O_{4}^{-}$ (all 1 µg L⁻¹). Dashed lines indicate the switching points of the three-step gradient at 40 s and 130 s. Mass traces were not normalized for their natural isotopic abundances to allow better comparison between individual signals and noise levels