EPA Method 624 Internal / Surrogate Standard Back Catalog number: 92559 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 53020 Verification II Standard 2 Price on request 11931.12-10MG N-Ethyl-N-(2-hydroxyethyl)perfluorooctylsulphonamide,neat,neat,10mg, Price on request 11412.17-K-ME Doxylamine succinate,1000 µg base/mL,MeOH,1mL, Price on request