EPA Method 548.1 Analyte Back Catalog number: 30277 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 95989 Method 8121 - Surrogate Standard Price on request 40019 EPA Method 622.1 Analytes Price on request 2690.34-5UG 17ß(H),21 alpha(H)-(22S)-Tetrakishomohopane , neat, Solvent-neat, Unit ca. 5µg, # of units-1, Cas.no. 79897-70-4 Price on request