2795-39-3 Usage
Description
Potassium heptadecafluoro-1-octanesulfonate, also known as perfluorooctane sulfonate (PFOS), is a persistent environmental pollutant that belongs to the class of perfluorinated surfactants. These fully fluorinated organic compounds possess unique chemical properties, such as repelling water and oil, reducing surface tension, and maintaining their properties under extreme conditions. PFOS is a stable end product that is resistant to degradation and has been found in biota and human blood, even in remote areas from production sites.
Uses
Used in Surface Treatments:
Potassium heptadecafluoro-1-octanesulfonate is used as a surface treatment agent for carpet and textile protection. Its ability to repel water and oil makes it an effective component in these applications.
Used in Paper Protection:
In the paper industry, Potassium heptadecafluoro-1-octanesulfonate is used as a paper protection agent, providing grease, oil, and water resistance to the paper products.
Used in Performance Chemicals:
Potassium heptadecafluoro-1-octanesulfonate is utilized as a performance chemical in various applications, such as firefighting foams, mining surfactants, and electronic etching baths. Its unique properties make it suitable for these demanding industrial processes.
Environmental and Health Concerns:
Due to the presence of PFOS in biota and human blood from sites remote from production, as well as its potential adverse health effects, PFOS has been voluntarily withdrawn from commercial production in the United States. In Europe, the use of PFOS is regulated by the Registration, Evaluation, Authorisation, and Restriction of Chemical (REACH) under Annex XVII.
Chemical Properties:
Potassium heptadecafluoro-1-octanesulfonate is a brown solid with unique chemical properties that make it suitable for various industrial applications. However, its persistence in the environment and potential health risks have led to increased scrutiny and regulation of its use.
Environmental Fate
As a result of the production and use of PFOS and its precursors,
it has been released into the environment through variety
of waste streams. The environmental partitioning behavior of
PFCs is unusual and differs from many other persistent organic
pollutants in that PFOS-based substances are both oleophobic
and hydrophobic. As a result, an octanol/water partitioning
coefficient (Kow) for PFOS has not been determined. PFOS is
persistent in the environment and does not hydrolyze, undergo
direct or indirect photolysis, or biodegrade to any significant
degree. While PFOS has low volatility, several PFOS precursors
are considered volatile, including EtFOSE and N-methyl
perfluorooctane sulfonamidoethanol alcohols, which may
account for its global distribution. As a result of its persistence
and widespread distribution, PFOS was recently added to the
Stockholm Convention’s list of persistent organic pollutants. If
released into soil, sediment, or sludge, PFOS is expected to
adsorb strongly to organic and inorganic components. Due to
these properties, PFOS is expected to persist in soils, sediments,
and sludge. If released into water, PFOS is expected to remain
in the water compartment unless it is assimilated into organisms
or adsorbed onto particulate matter and potentially
deposited into sediments. Volatilization from water surfaces or
biodegradation is not expected to be important fate processes.
PFOS has the potential to bioaccumulate in aquatic organisms.
Laboratory-based bioconcentration factors for PFOS range
from 56 to over 1000 while field-based bioaccumulation
factors range from 830 to 125 000. The field-based bioaccumulation
factors for PFOS may be overestimated due to
metabolism of accumulated perfluorinated derivatives of
PFOS. Trophic magnification of PFOS in food webs has also
been studied in several different aquatic systems. In a bottlenose
dolphin food web, the trophic magnification factor
(TMF) based on whole body concentrations ranged between
1.8 and 6.3. In an Eastern Arctic marine food web with glaucous
gulls as the top predator, the TMF for PFOS was 3.1 while in a Western Canadian Arctic food web the TMF was 1.9.
Finally, in a Lake Ontario food web, the TMF for PFOS was 3.8.
In a terrestrial environment that examined a food chain that
included lichen–caribou–wolf, the TMF for PFOS ranged from
2.3 to 2.6. Overall these results indicate that PFOS is magnified
up through different trophic levels in both aquatic and terrestrial
food webs.
Toxicity evaluation
The mechanisms governing the toxicity of PFOS to biological
systems are still under investigation. Potential modes of action
that have been identified include competition with fatty acids
for carrier protein sites, cholesterol synthesis, and bioenergetics.
Other studies suggest that PFOS may alter peroxisomal
fatty acid b-oxidation.
Check Digit Verification of cas no
The CAS Registry Mumber 2795-39-3 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 2,7,9 and 5 respectively; the second part has 2 digits, 3 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 2795-39:
(6*2)+(5*7)+(4*9)+(3*5)+(2*3)+(1*9)=113
113 % 10 = 3
So 2795-39-3 is a valid CAS Registry Number.
InChI:InChI=1/C8HF17O3S.K/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);/q;+1/p-1
