EPA Method 551 - Disinfection By-Products Back Catalog number: 32852 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 62221 Aroclor 1221 in Transformer Oil Price on request 1961.12-50-IO 2,4,4'-Tribromodiphenyl ether, 50µg/mL, Solvent-isooctane, Unit 1mL, # of units-1, Cas.no. 41318-75-6 Price on request 9408.15-100-ME alpha-Hydroxymetoprolol, 100µg/mL, Solvent-methanol, Unit 1mL, # of units-1, Cas.no. 56392-16-6 Price on request