Perfluorooctanesulfonic acid
- PFOS
- Perfluorooctanesulfonic
- Perfluoroktansulfonat
- C8F17O3S - ( anion)
- C8HF17O3S (acid)
- 45298-90-6 ( anion)
- 1763-23-1 (acid)
- 499.12 g · mol -1 ( anion)
- 500.13 g · mol -1 ( acid)
Fixed
Risk
Template: Infobox chemical / molecular formula search available
Perfluorooctane sulfonate ( PFOS) is the anion of perfluorooctane sulfonic acid and is one of the perfluorinated surfactants. It is usually offered as sodium or potassium perfluorooctane sulfonate commercially.
Representation
The display may be effected by PFOS Kleinstpolymerisierung of tetrafluoroethylene. The reaction is controlled so that chains are six carbon atoms. At this intermediate an ethylene molecule is added and subsequently converted to the sulfonate.
Properties
The peculiarity of PFOS is that the perfluorinated group is nonpolar, the polar anionic hydrophilic group on the other hand. Thus, it is a surfactant.
Use
PFOS was mainly used to make materials such as textiles, carpets and paper grease, oil and water resistant. In addition, it has been and is in chromium plating, in photography, in older fire-fighting foams (AFFF ) and used in hydraulic fluids for aviation and aerospace.
Hazards
PFOS is persistent, bioaccumulative and toxic to mammals. For this reason, all German chemical companies have production of PFOS set the world in 2002 and reformulated many products on the shorter PFBS.
In the environment PFOS is still emitted. The main sources are metal processing ( chrome plating ) and fire-fighting foams.
In summer 2006, high PFOS levels were measured in the Rhine and in the Ruhr. Sewage sludge from Belgium, who were declared incorrectly, the substances brought to Germany. Investigation revealed suspect that farmers were paid to deploy the polluted sludge on their fields. From there came constituents in groundwater and river water.
2012 Stoiber mill were in the lake north of Munich Airport and the Lindacher lake north of the air base Ingolstadt / Manching elevated levels of various perfluorinated surfactants demonstrated, including PFOS.
Ban
The European Parliament has decided in October 2006 to restrict the use of PFOS to a few applications. The " Directive 2006/122/EC of the European Parliament and of the Council " is (2006 / L 372 ) came on 27 December 2006 by publication in the Official Journal of the European Union.
In the 4th Conference of the Parties of the Stockholm Convention ( Geneva, 4th to 8th May 2009) it was decided to PFOS included in Annex B of the restricted substances under this Convention.