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Examples of tandem mass spectra obtained from analysing wastewater samples with Orbitrap that showed insufficient spectral similarity to reference spectra of (a) tramadol (interfering peaks), (b) ibuprofen (noisy sample spectrum), (c) N-desmethylvenlafaxine (noise and/or interfering peaks), and (d) losartan (noisy spectrum and interfering peaks) stored in the Eawag collection. Black dots indicate precursor mass that triggered the MS/MS spectra (hollow dot).
