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. 2021 Mar 25;414(1):425–438. doi: 10.1007/s00216-021-03263-1

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© The Author(s) 2021

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Fig. 3 — Fragment ion spectra for a) the drinking water sample, b) the WWTP effluent 2 sample and c) for the reference standard (500 ng/L). Spectra were recorded by a collision energy ramp from 15 eV to 40 eV from the precursor m/z 268.1545 using the HDMSE scan mode