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Correlation of RPLC retention time and CCS to specific constitutional isomers for PFOA (A) and PFOS (B). Dimethylated isomers elute earlier in RP-LC and tend to be more compact (smaller CCS) in comparison to singly-methylated isomers or linear forms of PFOA and PFOS (C and D). Error bars for both variation in retention time and CCS are illustrated, though some error bars are within marker size.
