SUPPORTING INFORMATION Modeling and Experimental Study on the Thermal Decomposition of Perfluorooctanesulfonic Acid (PFOS) in an α-alumina reactor Nathan H. Weber a , Cameron S. Delva a , Sebastian P. Stockenhuber a , Charles C. Grimison b , John A. Lucas a , John C. Mackie a *, Michael Stockenhuber a and Eric M. Kennedy a *. a Discipline of Chemical Engineering, School of Engineering, University of Newcastle, Callaghan, NSW, 2308, AUSTRALIA. b Ventia, North Sydney NSW 2138, AUSTRALIA S1. GC/MS methodology and table S2. Kinetic model for thermal decomposition of PFOS table S3. Predicted (model) and experimental thermal decomposition of PFOS concentration graphs for 200 mL/min and 300 mL/min S4. Micro GC and FT-IR C 2 F 4 concentration comparison S5. Atomic co-ordinates for species relevant in PFOS decomposition S6. NASA thermochemical coefficients for Chemkin modelling S7. PFOS concentration calculation example