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. 2021 Jul 8;414(3):1217–1225. doi: 10.1007/s00216-021-03463-9

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© The Author(s) 2021

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Fig. 2 — Extracted ion chromatograms for four FTMAPs in soil sample S13 (5-ppm window). 6:2/6:2 FTMAP (m/z 920.9812) was identified with the synthesized standard; further FTMAP homologues are characterized by the repeating unit C₂F₄ (Δ m/z 99.9936) and a systematic retention time shift