perfluorooctanoic acid (pfoa, c8) molecule. important and persistent pollutant

perfluorooctanoic octanoic fluoro fluorine fluoride pfoa perfluorooctanoate c8 fluorosurfactant perfluorocaprylic fluoropolymer emulsion polymerization ptfe persistent carcinogen pollutant environment liver blood environmental pollution fabric paper polytetrafluoroethylene stability fluorotelomer food contaminant microwave popcorn hormone hormonal serum hydrogen carbon oxygen molecule atoms atomic model molecular