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Mass spectra of the chromatographic regions containing 2-aminoacetophenone (2-AA; RI =1317) as acquired by GC-MS (Top) and GC×GC-TOFMS (Middle). Column bleed and co-eluting compounds in GC chromatography obscure the mass spectrum of the low-abundance compound 2-AA. GC×GC affords higher chromatographic purity, making it possible to identify low-abundance compounds by library matching. The NIST library spectrum of 2-AA is provided for reference (Bottom).
