Table 1.

Summary of a selection of common PFAS chemicals, detailing abbreviations, chemical formula, and half-life in humans.

Chemical Name	Abbreviation	Formula	Half-life in humans
Perfluorobutane sulfonic acid	PFBS	C4HF9O3S	28 days
Perfluorohexane sulphonic acid	PFHxS	C6HF13O3S	5.3 – 8.5 years
Perfluorooctane sulfonic acid	PFOS	C8F17SO3H	3.5 – 5 years
Perfluorooctane sulfonamide	PFOSA	C8H2F17NO2S	Unknown
Perfluorobutanoic acid	PFBA	C4HF7O2	3 days
Perfluoropentanoic acid	PFPeA	C5HF9O2	Unknown
Perfluorohexanoic acid	PFHxA	C6HF11O2	32 days
Hexafluoropropylene oxide dimer acid (MS-20244) (Q29388239)	GenX	C6HF11O3	Unknown (estimated 4 hours to 6 days)
Perfluoroheptanoic acid	PFHpA	C7HF13O2	1.2 – 2.5 years
Perfluorooctanoic acid	PFOA	C8HF15O2	2.1 – 3.8 years
Perfluorononanoic acid	PFNA	C9HF17O2	2.5 – 4.3 years
Perfluorodecanoic acid	PFDA	C10HF19O2	Unknown

Table adapted from Fenton et al. (12).