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. Author manuscript; available in PMC: 2021 Jun 5.
Published in final edited form as: Science. 2020 Jun 5;368(6495):1103–1107. doi: 10.1126/science.aba7127

Fig. 2:

Fig. 2:

Mass chromatograms (MS/MS mode), spectra and precursor/fragment structures of four smaller ClPFPECA congeners detected in NJ samples, identified in the upper left of the chromatograms by ethyl#,propyl#. Results for larger congeners are shown in Fig. S2. Chromatogram peaks consist of signal from precursors and selected major fragments. Note congeners elute in order according to molecular mass, small to large. Also note on major spectra the diagnostic mono-chlorine signal of 3:1 for 35Cl:37Cl.