Perfluorooctane sulfonates (PFOS) is a general designation of perfluorooctane sulfonates. Its formula is c8f17so2x, in which X can be hydroxyl, metal salt, halide, amino group or other derivative group.
Because of its hydrophobic, hydrophobic and chemically stable properties, PFOS is widely used in textiles, carpets, paper, coatings, fire fighting foam, image materials, aviation hydraulic oil and other fields.
Such as: (1) carpet, clothing, leather, paper, interior decoration, all kinds of textile surface treatment layer;
(2) fireproof foam;
(3) Surfactant for petrochemical industry, such as shampoo, floor polish, etc;
(4) Acid mist inhibitor for metal plating;
(5) Hydraulic oil;
(7) Adhesives and coatings frequently used in electronic and electrical equipment;
(8) Others: photographic, plate printing and other coatings.
Relevant research shows that PFOS is one of the most difficult organic pollutants found in the world and has a high bioaccumulation capacity. Once organisms ingest PFOS, it will be mainly distributed in blood and liver, which is difficult to decompose through metabolism. Its half emission time will take 8.7 years, and long-term exposure will cause serious harm to health. In December 2002, the 34th joint meeting of the chemical Committee of the international organization for economic and development (OECD) defined PFOS as "a substance that is persistent in the environment, has biological savings and is harmful to human beings". According to European Council of Ministers (EEC) No. 793 / 93 regulation on the assessment and control of the risks of existing substances, the UK has submitted the PFOS risk assessment report and the strategy for reducing the risks of PFOS to the European Commission, as well as the impact assessment of the strategy. The European health and environmental hazards Scientific Committee (Scher) conducted a scientific review of the strategy submitted by the United Kingdom and confirmed the hazards of PFOS on March 18, 2005. The following are the restrictions on PFOS in the world.
Europe: on December 27, 2006, the European Parliament and the Council of Ministers jointly issued the directive on restricting the sale and use of PFOS (2006 / 122 / EC), which strictly restricted the use of PFOS. The Directive requires members to convert the contents of the directive into national decrees by December 27, 2007, and to implement restrictive measures by June 27, 2008. In 2005, Sweden proposed a global ban on PFOS and related substances under the Stockholm Convention on persistent organic pollutants. In 2007, the Ministry of environment of Norway passed new regulations on the use of PFOS in textiles, fire foam and impregnating liquid, and the new regulations will come into effect in July 1, 2007. According to reach regulation, PFOS is a chemical that needs to be authorized before use.
North America: in 2000, the U.S. Environmental Protection Agency also banned PFOS from use in textiles, clothing, carpets, and other items, except for special uses in the aviation, photography, and microelectronics industries. In early 2007, the Environment Canada issued a regulatory proposal for PFOS, its salts and certain other compounds, which would prohibit the production, sale and import of PFOS (except for a small exemption).
Australia: PFOS related chemicals are also restricted in Australia. They can only be used when no more suitable and less hazardous substances can be found.
According to EU Directive 2006 / 122 / EC, it is prohibited to sell or use PFOS in EU without permission; the content of PFOS in accessories shall not exceed 0.005%; the content of PFOS in finished products, semi-finished products and parts of various consumer products shall not exceed 0.1%; for textiles or other surface coated articles, the content of PFOS in coating area per square meter shall not exceed 1 microgram. As PFOS is widely used in surface coating, the European Commission stipulates that the concentration limit of PFOS in coating products shall not be calculated as a whole product, but as a part of products containing PFOS.