Perfluorooctanesulfonate and its salts (PFOS) are derived from perfluorooctanesulfonyl fluoride, the basic chemical building block for many sulfonyl-based fluorochemicals used as surfactants and for their repellent properties.
The Applicability of Biomonitoring Data for Perfluorooctanesulfonate to the Environmental Public Health Continuum
Environmental Health Perspectives, 2006