Perfluorooctanesulfonic acid
Fluorosurfactant and persistent organic pollutant / From Wikipedia, the free encyclopedia
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Perfluorooctanesulfonic acid (PFOS) (conjugate base perfluorooctanesulfonate) is a chemical compound having an eight-carbon fluorocarbon chain and a sulfonic acid functional group and thus a perfluorosulfonic acid. 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.[4]
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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 | |
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ECHA InfoCard | 100.015.618 |
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CompTox Dashboard (EPA) |
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Properties | |
C8HF17O3S | |
Molar mass | 500.13 g/mol |
Boiling point | 133 °C (271 °F; 406 K) at 6 torr |
Acidity (pKa) | <<0[1][2] |
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Main hazards |
Toxic, persistent environmental pollutant |
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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).
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