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 Y
3D model (JSmol)	Interactive image
ChEBI	CHEBI:39421 Y
ChemSpider	67068 Y
ECHA InfoCard	100.015.618
EC Number	217-179-8
KEGG	C18142 Y
PubChem CID	74483
UNII	9H2MAI21CL Y
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) Y Key: YFSUTJLHUFNCNZ-UHFFFAOYSA-N Y 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), 6:2-Fluorotelomersulfonic acid
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Y verify (what is YN ?) Infobox references

Perfluorooctanesulfonic acid and its conjugate base perfluorooctanesulfonate) are chemicals having an eight-carbon fluorocarbon chain and a sulfonic acid or sulfonate functional group. Collectively, the two species are called PFOS. The acid is an example of perfluorosulfonic acid. The acid and the sulfonate salts are perfluoroalkyl substances (PFAS). Once a poplular fluorosurfactant, PFOS is 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.