Figure 2.

(A) GC-MS/MS nominal quantification of micro-O-ring absorption of each PAH in a 10 µg/mL methanol solution based on modified protocol from Smith et al. with corresponding LogK_OW values in brackets [24]. Absorption was measured at 0, 0.5, 1, 2, 4, 8, and 24 h timepoints. All PAH are absorbed to saturation quickly (within 1 hr) except for chrysene and benzo[a]anthracene, which are structural isomers. Other structural isomers also exhibit comparable kinetics of absorption (Table S4). (B) Correlation plot showing the negative inverse relationship between LogK_OW of individual PAH and the nominal concentration absorbed by micro-O-rings after 1 and 24 h. Results over 1 and 24 h exhibit similar relationships to hydrophobicity, indicating that saturation is reached quickly and maintained.