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. Author manuscript; available in PMC: 2022 Jun 15.
Published in final edited form as: Environ Sci Technol. 2022 Feb 17;56(6):3441–3451. doi: 10.1021/acs.est.1c06483

Figure 2.

Figure 2.

Historic North Carolina pine PFAS profiles. (A) Chemical structures of example legacy and emerging PFAS, perfluorooctanoic acid (PFOA), and perfluoromethoxypropionic acid (PFMPA). (B) Legend for the historic PFAS ToxPis in C. Each slice represents an individual PFAS compound colored by class, and the numbers indicate the numbers of carbon present in the PFAS. PFSAs, PFCAs, and FTSs with two hydrocarbons (n:2) are ordered clockwise by increasing chain length except for branched isomers (br-n). The height of the slice corresponds to the scaled abundance with 0 as not detected and 1 as the maximum signal detected across all samples. (C) Timeline visualizing the temporal and spatial PFAS trends across multiple North Carolina counties from 1961 to 2005. Each county is represented by a different row as shown on the right side of the graph. Historical information is also added on the timeline with stars to highlight some of the PFAS trends.