Ammonium (NH4+) Back Catalog number: 54533 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 1165.12-K-IO 2,2,4,4-Tetramethyloctane, 1000µg/mL, Solvent-isooctane, Unit 1mL, # of units-1, Cas.no. 62183-79-3 Price on request 59488 ICP-MS Multi-Element Custom Solution Price on request DF-IS-D Mass-Labelled PCDD/PCDF Internal Standard Solution, 1.2ml, nonane Price on request