Sixty PFAS used in this study are listed in Table , Supporting Information (SI). Of these 60, 59 were used in our previous study and 10:2 FTO was added to the current list. In addition, 78 nonfluorinated reference compounds with known solute descriptors were analyzed for GC retention times. A complete list of these compounds with suppliers, purities, and CAS Registry numbers is provided in the SI (Table ). GC grade acetone and n-hexane and LC/MS grade methanol from Fujifilm Wako Pure Chemical Corporation (Osaka, Japan) and n-octan-1-ol (>99.5%) from Tokyo Chemical Industry (Tokyo, Japan) were used as solvents. Tap water was treated by reverse osmosis and further purified with an Ultrapure Water System (RFU665DA, Advantec, Tokyo, Japan).