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. 2023 May 15;57(21):8096–8106. doi: 10.1021/acs.est.3c00675

Figure 2.

Figure 2

Mass budget for PFAS in groundwater below the fire training area at Joint Base Cape Cod. (a) Comparison of measured concentrations of EOF to PFAS concentrations measured in JBCC groundwater. The x-axis represents the sum of terminal PFAS and oxidizable precursors inferred from the total oxidizable precursor assay using Bayesian Inference (TOP+BI). The sum of differences from duplicate extracts for targeted PFAS (9%; n = 1) and the standard deviation of inferred precursor concentrations are shown by x-axis error bars. The percent difference in EOF (y-axis) from duplicate extracts was 1% (n = 1). Circles are shaded in purple by the fraction of EOF explained by oxidizable precursors. The one-to-one line (gray) is used to compare the sum of terminal PFAS and precursors measured using targeted analysis and the TOP inference with EOF. (b) Average composition of JBCC groundwater below the fire training area across samples from multiple years (n = 6, 2007–2021). Raw data are presented in Table S7.