EPA Method 502.2 Surrogate Standard Back Catalog number: 91704 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 1569.18-250MG Norcodeine, neat, Solvent-neat, Unit 250mg, # of units-1, Cas.no. 467-15-2 Price on request 3749.6-250MG 1,3,5-Trichlorobenzene,neat,neat,250mg, Price on request 0938.8-K-IO Benzothiophene, 1000µg/mL, Solvent-isooctane, Unit 1mL, # of units-1, Cas.no. 95-15-8 Price on request