Ammonium Standard: NH4+, 1000µg/ml in Water, 100ml Back Catalog number: VHG-INH41K-100 Availability: In the manufacturer's stock Price on request - + Recommended 52099 ICP-MS Calibration Standard Price on request 2506.12-50-T 5,5'-Difluoro-2,2',4,4'-tetrabromodiphenyl ether (2,2',4,4'-Tetrabromo-5,5'-difluorodiphenyl ether), 50µg/mL, Solvent-toluene, Unit 1mL, # of units-1, Cas.no. 886748-32-9 Price on request 34052 EPA Method 524.2 - Additional Analytes Price on request