Perfluorooctanesulfonic acid

Perfluorooctanesulfonic acid
Names
	Preferred IUPAC name 1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8,8-Heptadecafluorooctane-1-sulfonic acid
	Other names PFOS
Identifiers
CAS Number	1763-23-1 ;
3D model (JSmol)	Interactive image;
ChEBI	CHEBI:39421 ;
ChemSpider	67068 ;
ECHA InfoCard	100.015.618
EC Number	217-179-8;
KEGG	C18142 ;
PubChem CID	74483;
UNII	9H2MAI21CL ;
CompTox Dashboard (EPA)	DTXSID3031864 ;
	InChI InChI=1S/C8HF17O3S/c9-1(10,3(13,14)5(17,18)7(21,22)23)2(11,12)4(15,16)6(19,20)8(24,25)29(26,27)28/h(H,26,27,28) Key: YFSUTJLHUFNCNZ-UHFFFAOYSA-N ; InChI=1/C8HF17O3S/c9-1(10,3(13,14)5(17,18)7(21,22)23)2(11,12)4(15,16)6(19,20)8(24,25)29(26,27)28/h(H,26,27,28) Key: YFSUTJLHUFNCNZ-UHFFFAOYAS;
	SMILES FC(F)(C(F)(F)S(=O)(=O)O)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)F;
Properties
Chemical formula	C8HF17O3S
Molar mass	500.13 g/mol
Boiling point	133 °C (271 °F; 406 K) at 6 torr
Acidity (pKa)	<<0
Hazards
	Occupational safety and health (OHS/OSH):
Main hazards	Toxic, persistent environmental pollutant
	GHS labelling:
Pictograms
Signal word	Danger
NFPA 704 (fire diamond)	3 0 0
Pharmacology
Legal status	US: Illegal in California and Maine; Restricted internationally under Stockholm Convention;
Related compounds
Related compounds	Perfluorooctanoic acid (PFOA), Perfluorobutanesulfonic acid (PFBS), Perfluorooctanesulfonamide (PFOSA), Perfluorononanoic acid (PFNA)
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Perfluorooctanesulfonic acid (PFOS) (conjugate base perfluorooctanesulfonate) is a chemical compound having an eight-carbon fluorocarbon chain and a sulfonic acid functional group, and thus it is a perfluorosulfonic acid and a perfluoroalkyl substance (PFAS). It is an anthropogenic (man-made) fluorosurfactant, now regarded as a global pollutant. PFOS was the key ingredient in Scotchgard, a fabric protector made by 3M, and related stain repellents. The acronym "PFOS" refers to the parent sulfonic acid and to various salts of perfluorooctanesulfonate. These are all colorless or white, water-soluble solids. Although of low acute toxicity, PFOS has attracted much attention for its pervasiveness and environmental impact. It was added to Annex B of the Stockholm Convention on Persistent Organic Pollutants in May 2009.