A first global production, emission, and environmental inventory for perfluorooctane sulfonate.

By Alexander G. Paul, Kevin C. Jones, A. Sweetman. Environmental Science and Technology, 2009

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Fate and effects of poly‐ and perfluoroalkyl substances in the aquatic environment: A review (2014, neutral): “In recent years, PFSA concentrations showed decreasing trends in biota because of the phase-out of PFOS in 2002 [7,58,76].”
Polyfluorinated compounds: past, present, and future. (2011, background): “existing market demands, with an estimated 1,000 t per year being produced since 2002 [34].”
PFAS Exposure Pathways for Humans and Wildlife: A Synthesis of Current Knowledge and Key Gaps in Understanding (2020, background): “…production and distribution of the legacy PFAS has been greatly facilitated by academic partnerships with industry that allowed the development of global emissions inventories for some compounds (Prevedouros et al. 2006; Paul et al. 2009; Armitage et al. 2009a, 2009b; Wang et al. 2014a, 2017).”
Perfluoroalkyl and Polyfluoroalkyl Substances in the Environment: Terminology, Classification, and Origins (2011, background): “In this process, the electrolysis of a solution of octane sulfonyl fluoride in anhydrous HF leads to perfluorooctane sulfonyl fluoride, C8F17SO2F (POSF), the key intermediate from which all PFOS-related products are subsequently produced (3M Company 1999; Brooke et al. 2004; Lehmler 2005; Paul et al”