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. 2021 Oct 9;18(20):10587. doi: 10.3390/ijerph182010587

Figure 5.

Figure 5

MS spectra of the (a) untreated and (b) treated PPC impregnated with pyrene; (c) untreated and (d) treated PPC impregnated with 9-methylanthracene; all after the heterogeneous experiments performed under dry conditions. In figure: (A) Unidentified phenanthrenic structure; (B) cyclopenta[def]phenanthren-4-one [43]; (C) 4-oxapyren-5-one [39,40,41,42]; (D) phenanthrene-4,5-dicarboxaldehyde [39,40,41,42]; (E) anthracene; (F) 9-anthracenecarboxaldehyde; and (G) hydroxy-9,10-anthracenedione [45]. (The green and blue rectangles indicate the pyrene and 9-methylanthracene signals, respectively). The scale is normalized to the base peak.