Fig. 6From: NORMAN guidance on suspect and non-target screening in environmental monitoringInterplay between resolution (R) and mass accuracy exemplified by the two isomers mecoprop, clofibric acid and the isobar diuron-4-hydroxy. a Mass spectra for the isobaric ions acquired at a resolving power of 10,000 and 30,000. b Ion formula calculation based on the accurate monoisotopic mass and defining the ion species as [M − H]−Back to article page