Ammonium (NH4+) Back Catalog number: 54533 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 95359 Surrogate Mix Price on request 2127.12-100-IOX5 Arochlor 1248 , 100µg/mL, Solvent-isooctane, Unit 1mL, # of units-5, Cas.no. 12672-29-6 Price on request 675340 Metrafenone, 100 µg/ml, Acetonitrile, 5ml Price on request