Perfluorosulfonic acids
Perfluorosulfonic acids ( PFSA from English perfluorosulfonic acid ) are chemical compounds of the formula C n F (2n + 1) SO 3 H and thus belong to the family of perfluorinated and polyfluorinated alkyl compounds (PFAS). The simplest example of a perfluorosulfonic acid is trifluoromethanesulfonic acid . PFSA with six or more perfluorinated carbon atoms , i.e. from perfluorohexanesulfonic acid , are called long-chain.
properties
Perfluorosulfonic acids are organofluoro analogs of common alkanesulfonic acids , but they are several p K S units stronger (and are therefore strong acids ) and have a strong hydrophobic character.
use
The perfluorooctane sulfonic acid , for example, the hard chrome plating used.
regulation
The perfluorooctane sulfonic acid was included in the Annex B of the 2009 Stockholm Convention and subsequently in the EU Regulation on POPs added.
The perfluorohexanesulfonic acid incl. Their salts and related compounds has been proposed for inclusion in the Stockholm Convention.
Individual evidence
- ↑ Terminology | FluoroCouncil. Retrieved October 26, 2019 .
- ↑ Regulation (EU) 2019/1021 of the European Parliament and of the Council of 20 June 2019 on persistent organic pollutants, accessed on October 27, 2019
- ↑ UN experts recommend elimination of additional hazardous chemicals to protect human health and the environment. Retrieved October 26, 2019 (UK English).