C8F17SO3

C8F17SO3, also known as perfluorooctanesulfonate or PFOS, is a synthetic chemical compound belonging to the perfluoroalkyl and polyfluoroalkyl substances (PFAS) family. It is characterized by a chain of eight carbon atoms that are fully substituted with fluorine atoms, linked to a sulfonate group. This unique chemical structure imparts extreme stability and resistance to heat, water, and oil.

Historically, PFOS and its salts were widely used in various industrial and consumer applications due to their desirable properties. These included their use in firefighting foams (aqueous film-forming foam or AFFF), surface treatments for carpets and textiles, stain-resistant coatings, and in some photographic processes. The compound's ability to repel both water and oil made it a valuable component in many products designed for durability and performance.

However, concerns have arisen regarding the persistence, bioaccumulation, and potential toxicity of PFOS. Due to its strong carbon-fluorine bonds, PFOS does not readily break down in the environment and can persist for very long periods. It has been detected in wildlife and humans globally. Regulatory bodies and scientific organizations have been increasingly scrutinizing its use and environmental impact, leading to restrictions and phase-outs in many countries. Research continues to explore its environmental fate, transport, and potential health effects.