(A) GC-Orbitrap total ion chromatogram (TIC) comparisons of 1,2,2,2-Tetrafluoroethyl trifluoromethyl ether standard (top) and degradation product of PMPA in acetone in 5 days in black color and acetone blank in gray color (bottom); (B) mass spectra of 1,2,2,2-Tetrafluoroethyl trifluoromethyl ether standard (top) and degradation product of PMPA in acetone in 5 days (bottom); (C) mass spectra list of 1,2,2,2-Tetrafluoroethyl trifluoromethyl ether standard (top) and degradation product of PMPA in acetone in 5 days (bottom).