18 Perfluorooctanesulfonate (PFOS), Its Occurrence, Fate …
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Table 18.1 Physical and chemical characteristics of PFOS
Characteristics PFOS (acidic form)
References
Chemical
Abstracts
Service
Registry No.
(CASRN)
1763-23-1
Chemical
abstracts index
name
1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8,8-heptadecafluoro1-octanesulfonic
acid
Synonyms
Perfluorooctane sulfonic acid; heptadecafluoro1-octane sulfonic
acid; PFOS acid
Chemical
formula
C 8 HF 17 O 3 S
Molecular
weight (g/mol)
500.13
HSDB
(2012),
Lewis
(2004),
SRC
(2016)
Color/physical
state
White powder (potassium salt)
OECD
(2002)
Boiling point
258–260 °C
SRC
(2016)
Melting point
No data available
Vapor pressure 2.0 × 10 −3 mm Hg at 25 °C (estimate)
HSDB
(2012)
Henry’s law
constant
Not measureable
ATSDR
(2015)
pKa
<1.0
K ow
Not measureable
ATSDR
(2015),
EFSA
(2008)
Log K aw
<2 × 10 −6
K oc
2.57
Higgins
and Luthy
(2006)
Solubility in
water
680 mg/L
OECD
(2002)
Half-life in
water
Stable
UNEP
(2006)
Half-life in air Stable
UNEP
(2006)
K ow octanol-water partition co-efficient; K aw air-water partition co-efficient; K oc organic carbonwater partitioning coefficient