EPA Method 551.1 Surrogate Standard Back Catalog number: 31102 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 1338.31-500-IO 17?(H),21ß(H)-(22S)-Homohopane, 500µg/mL in Isooctane, 1mL Price on request 66174 2,2',3,3',4,5,6'-Heptachlorobiphenyl (174) Price on request 6164-3-02:250G Trifluoromethanesulfonic acid, PFC-MS, 99,5%, 250g Price on request