EPA Method 548 Analyte Back Catalog number: 30047 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 54214 Ammonia as (NH4+) Price on request 677674 4-Ethylphenol, 500mg Price on request 1990.12-5MG 2,4,4',6-Tetrabromodiphenyl ether, neat, Solvent-neat, Unit 5mg, # of units-1, Cas.no. 189084-63-7 Price on request